阅读说明：本技术 卫星定位信号的干扰检测方法及装置 (Interference detection method and device for satellite positioning signal ) 是由 朱宇 邓磊 吉铜元 于 2021-06-10 设计创作，主要内容包括：本申请提出一种卫星定位信号的干扰检测方法及装置,其中,方法包括：获取射频信号,其中所述射频信号至少包括卫星定位信号；根据所述射频信号,确定所述卫星定位信号的定位信息和所述射频信号的功率；根据所述定位信息和功率,确定所述射频信号中是否存在干扰信号。本申请的技术方案,不仅实现成本低,而且可以降低卫星定位信号中干扰信号检测的复杂性,有较强的实用性。(The application provides a method and a device for detecting interference of satellite positioning signals, wherein the method comprises the following steps: acquiring a radio frequency signal, wherein the radio frequency signal at least comprises a satellite positioning signal; determining positioning information of the satellite positioning signal and power of the radio frequency signal according to the radio frequency signal; and determining whether an interference signal exists in the radio frequency signal according to the positioning information and the power. The technical scheme of the application not only realizes with low costsly, can reduce the complexity that the jamming signal detected among the satellite positioning signal moreover, has stronger practicality.)

1. A method for interference detection of satellite positioning signals, comprising:

acquiring a radio frequency signal; wherein the radio frequency signals comprise at least satellite positioning signals;

determining positioning information of the satellite positioning signal and power of the radio frequency signal according to the radio frequency signal;

and determining whether an interference signal exists in the radio frequency signal according to the positioning information and the power.

2. The method of claim 1, wherein said determining the positioning information of the satellite positioning signal and the power of the radio frequency signal from the radio frequency signal comprises:

dividing the radio frequency signal into a first path of radio frequency signal and a second path of radio frequency signal;

determining positioning information of the satellite positioning signal according to the first path of radio frequency signal;

and determining the power of the radio frequency signal according to the second path of radio frequency signal.

3. The method of claim 1, wherein the positioning information comprises positioning success information and signal-to-carrier-and-noise ratios corresponding to each satellite; wherein determining whether an interference signal exists in the radio frequency signal according to the positioning information and the power comprises:

obtaining an average signal carrier-to-noise ratio according to the signal carrier-to-noise ratios corresponding to the satellites;

judging whether the average signal carrier-to-noise ratio is larger than a preset signal carrier-to-noise ratio threshold value or not;

determining that no interfering signal is present in the radio frequency signal in response to the average signal-to-carrier-to-noise ratio being greater than the signal-to-carrier-to-noise ratio threshold;

responding to the average signal carrier-to-noise ratio smaller than or equal to the signal carrier-to-noise ratio threshold, and judging whether the power of the radio-frequency signal is smaller than a preset power threshold within a preset time period;

determining that no interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being less than the power threshold within a preset time period;

and determining that an interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being greater than or equal to the power threshold value within a preset time period.

4. The method of claim 1, wherein the positioning information comprises positioning failure information and signal-to-carrier-noise ratios corresponding to the satellites; wherein determining whether an interference signal exists in the radio frequency signal according to the positioning information and the power comprises:

judging whether the power of the radio frequency signal is smaller than a preset power threshold value within a preset time period;

determining that no interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being less than the power threshold within a preset time period;

and determining that an interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being greater than or equal to the power threshold value within a preset time period.

5. The method of claim 3 or 4, further comprising:

and when the interference signal exists in the radio frequency signal, determining the strength of the interference signal in the radio frequency signal according to the power of the radio frequency signal.

6. An apparatus for detecting interference of a satellite positioning signal, comprising:

the satellite receiving antenna is used for acquiring radio frequency signals; wherein the radio frequency signals comprise at least satellite positioning signals;

the power divider is used for dividing the radio frequency signal into a first path of radio frequency signal and a second path of radio frequency signal;

the positioning module is used for determining positioning information of the satellite positioning signal according to the first path of radio frequency signal;

the power detection module is used for determining the power of the radio frequency signal according to the second path of radio frequency signal;

and the control module is used for determining whether an interference signal exists in the radio frequency signal according to the positioning information and the power.

7. The apparatus of claim 6, wherein the positioning information comprises positioning success information and signal-to-carrier-and-noise ratios corresponding to each satellite; wherein the control module is specifically configured to:

obtaining an average signal carrier-to-noise ratio according to the signal carrier-to-noise ratios corresponding to the satellites;

judging whether the average signal carrier-to-noise ratio is larger than a preset signal carrier-to-noise ratio threshold value or not;

determining that no interfering signal is present in the radio frequency signal in response to the average signal-to-carrier-to-noise ratio being greater than the signal-to-carrier-to-noise ratio threshold;

responding to the average signal carrier-to-noise ratio smaller than or equal to the signal carrier-to-noise ratio threshold, and judging whether the power of the radio-frequency signal is smaller than a preset power threshold within a preset time period;

determining that no interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being less than the power threshold within a preset time period;

and determining that an interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being greater than or equal to the power threshold value within a preset time period.

8. The apparatus of claim 6, wherein the positioning information of the satellite positioning signal comprises positioning failure information and a signal-to-carrier-to-noise ratio corresponding to each satellite; wherein the control module is specifically configured to:

judging whether the power of the radio frequency signal is smaller than a preset power threshold value within a preset time period;

determining that no interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being less than the power threshold within a preset time period;

and determining that an interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being greater than or equal to the power threshold value within a preset time period.

9. The apparatus of claim 7 or 8, wherein the control module is further configured to:

and when the interference signal exists in the radio frequency signal, determining the strength of the interference signal in the radio frequency signal according to the power of the radio frequency signal.

10. The apparatus of claim 6, further comprising:

the first band-pass filter is used for carrying out band-pass filtering processing on the radio-frequency signal to obtain a first filtered radio-frequency signal;

the first low-noise amplifier is used for amplifying the first filtered radio-frequency signal to obtain a first amplified radio-frequency signal;

the power divider is configured to divide the first amplified radio frequency signal into the first path of radio frequency signal and the second path of radio frequency signal.

11. The apparatus of claim 6, further comprising:

the second band-pass filter is used for carrying out band-pass filtering processing on the second path of radio frequency signals to obtain second filtered radio frequency signals;

the second low-noise amplifier is used for amplifying the second filtered radio-frequency signal to obtain a second amplified radio-frequency signal;

the power detection module is configured to determine the power of the radio frequency signal according to the second amplified radio frequency signal.

Technical Field

The present application relates to the field of satellite positioning technologies, and in particular, to a method and an apparatus for detecting interference of a satellite positioning signal.

Background

Satellite Positioning systems, such as GPS (Global Positioning System) and beidou, are widely used in various industries. Due to the characteristics of satellite signals, the strength of signals reaching the ground is very weak, so that if the ground has same-frequency signals, the satellite positioning function is easy to interfere and cannot work normally.

At present, the same frequency interference device has the characteristics of simple structure, easy manufacture and the like, and is used for some illegal purposes by certain organizations or individuals. The satellite signal co-channel jammer can cause great influence on the reception of satellite positioning signals, and once the satellite positioning jammer is started, a satellite positioning receiver nearby within hundreds of meters or even kilometers cannot work. Because the application scenes of the satellite positioning information are very wide, the loss of the positioning information will influence the normal work of the related scenes, thereby causing serious loss.

Disclosure of Invention

Based on the above problem, the present application aims to provide a method and an apparatus for detecting interference of a satellite positioning signal.

According to a first aspect of the present application, a method for detecting interference of a satellite positioning signal is provided, including:

acquiring a radio frequency signal; wherein the radio frequency signals comprise at least satellite positioning signals;

determining positioning information of the satellite positioning signal and power of the radio frequency signal according to the radio frequency signal;

and determining whether an interference signal exists in the radio frequency signal according to the positioning information and the power.

In one implementation, the determining, according to the radio frequency signal, the positioning information of the satellite positioning signal and the power of the radio frequency signal includes:

dividing the radio frequency signal into a first path of radio frequency signal and a second path of radio frequency signal;

determining positioning information of the satellite positioning signal according to the first path of radio frequency signal;

and determining the power of the radio frequency signal according to the second path of radio frequency signal.

In some embodiments of the present application, the positioning information includes positioning success information and signal carrier-to-noise ratios corresponding to the satellites; wherein determining whether an interference signal exists in the radio frequency signal according to the positioning information and the power comprises:

obtaining an average signal carrier-to-noise ratio according to the signal carrier-to-noise ratios corresponding to the satellites;

judging whether the average signal carrier-to-noise ratio is larger than a preset signal carrier-to-noise ratio threshold value or not;

determining that no interfering signal is present in the radio frequency signal in response to the average signal-to-carrier-to-noise ratio being greater than the signal-to-carrier-to-noise ratio threshold;

responding to the average signal carrier-to-noise ratio smaller than or equal to the signal carrier-to-noise ratio threshold, and judging whether the power of the radio-frequency signal is smaller than a preset power threshold within a preset time period;

determining that no interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being less than the power threshold within a preset time period;

and determining that an interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being greater than or equal to the power threshold value within a preset time period.

In other embodiments of the present application, the positioning information includes positioning failure information and signal carrier-to-noise ratios corresponding to the satellites; wherein determining whether an interference signal exists in the radio frequency signal according to the positioning information and the power comprises:

judging whether the power of the radio frequency signal is smaller than a preset power threshold value within a preset time period;

determining that no interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being less than the power threshold within a preset time period;

and determining that an interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being greater than or equal to the power threshold value within a preset time period.

In some embodiments of the present application, when it is determined that an interfering signal is present in the radio frequency signal, the strength of the interfering signal in the radio frequency signal is determined according to the power of the radio frequency signal.

According to a second aspect of the present application, an interference detection apparatus for satellite positioning signals is provided, comprising:

the satellite receiving antenna is used for acquiring radio frequency signals; wherein the radio frequency signals comprise at least satellite positioning signals;

the power divider is used for dividing the radio frequency signal into a first path of radio frequency signal and a second path of radio frequency signal;

the positioning module is used for determining positioning information of the satellite positioning signal according to the first path of radio frequency signal;

the power detection module is used for determining the power of the radio frequency signal according to the second path of radio frequency signal;

and the control module is used for determining whether an interference signal exists in the radio frequency signal according to the positioning information and the power.

In some embodiments of the present application, the positioning information includes positioning success information and signal carrier-to-noise ratios corresponding to the satellites; wherein the control module is specifically configured to:

obtaining an average signal carrier-to-noise ratio according to the signal carrier-to-noise ratios corresponding to the satellites;

judging whether the average signal carrier-to-noise ratio is larger than a preset signal carrier-to-noise ratio threshold value or not;

determining that no interfering signal is present in the radio frequency signal in response to the average signal-to-carrier-to-noise ratio being greater than the signal-to-carrier-to-noise ratio threshold;

responding to the average signal carrier-to-noise ratio smaller than or equal to the signal carrier-to-noise ratio threshold, and judging whether the power of the radio-frequency signal is smaller than a preset power threshold within a preset time period;

determining that no interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being less than the power threshold within a preset time period;

and determining that an interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being greater than or equal to the power threshold value within a preset time period.

In other embodiments of the present application, the positioning information includes positioning failure information and signal carrier-to-noise ratios corresponding to the satellites; wherein the control module is specifically configured to:

judging whether the power of the radio frequency signal is smaller than a preset power threshold value within a preset time period;

determining that no interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being less than the power threshold within a preset time period;

and determining that an interference signal exists in the radio frequency signal in response to the power of the radio frequency signal being greater than or equal to the power threshold value within a preset time period.

In some embodiments of the present application, the control module is further configured to:

and when the interference signal exists in the radio frequency signal, determining the strength of the interference signal in the radio frequency signal according to the power of the radio frequency signal.

Optionally, the apparatus for detecting interference of satellite positioning signals further includes:

the first band-pass filter is used for carrying out band-pass filtering processing on the radio-frequency signal to obtain a first filtered radio-frequency signal;

the first low-noise amplifier is used for amplifying the first filtered radio-frequency signal to obtain a first amplified radio-frequency signal;

the power divider is configured to divide the first amplified radio frequency signal into the first path of radio frequency signal and the second path of radio frequency signal.

Optionally, the apparatus for detecting interference of satellite positioning signals further includes:

the second band-pass filter is used for carrying out band-pass filtering processing on the second path of radio frequency signals to obtain second filtered radio frequency signals;

the second low-noise amplifier is used for amplifying the second filtered radio-frequency signal to obtain a second amplified radio-frequency signal;

the power detection module is configured to determine the power of the radio frequency signal according to the second amplified radio frequency signal.

According to the technical scheme of the application, whether the interference signal exists in the radio frequency signal or not is determined according to the positioning information and the power of the radio frequency signal by respectively acquiring the positioning information of the satellite positioning signal and the power of the radio frequency signal, and therefore the detection mode is low in implementation cost, complexity of detection of the interference signal in the satellite positioning signal can be reduced, and the method has high practicability.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic diagram illustrating an interference detection apparatus for satellite positioning signals according to an embodiment of the present disclosure;

fig. 2 is a schematic diagram of another interference detection apparatus for satellite positioning signals according to an embodiment of the present application;

fig. 3 is a method for detecting interference of a satellite positioning signal according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram illustrating another method for detecting interference of a satellite positioning signal according to an embodiment of the present application;

fig. 5 is a flowchart of an interference signal detection method according to an embodiment of the present disclosure;

fig. 6 is a flowchart of another interference signal detection method according to an embodiment of the present application.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

An interference detection method and apparatus for a satellite positioning signal according to an embodiment of the present application will be described with reference to the accompanying drawings.

Fig. 1 is a block diagram of an interference detection apparatus for satellite positioning signals according to an embodiment of the present application, and as shown in fig. 1, the apparatus includes: the system comprises a satellite receiving antenna 101, a power divider 102, a positioning module 103, a power detection module 104 and a control module 105.

The satellite receiving antenna 101 is used for acquiring radio frequency signals; the radio frequency signals comprise at least satellite positioning signals;

the power divider 102 is configured to divide the radio frequency signal into a first radio frequency signal and a second radio frequency signal; the first path of radio frequency signal and the second path of radio frequency signal are two paths of radio frequency signals which are completely the same as the original radio frequency signals;

the positioning module 103 is configured to determine positioning information of a satellite positioning signal according to the first radio frequency signal;

the power detection module 104 is used for determining the power of the radio frequency signal according to the second path of radio frequency signal;

and the control module 105 is configured to determine whether an interference signal exists in the radio frequency signal according to the positioning information of the satellite positioning signal and the power of the radio frequency signal.

It should be noted that the radio frequency signals acquired by the satellite receiving antenna 101 at least include satellite positioning signals and possibly also include co-channel interference signals. The satellite positioning signal is transmitted by a satellite positioning system, wherein the satellite positioning system can be a GPS, a Beidou satellite positioning system and the like, and the application does not limit the satellite positioning system.

In the embodiment of the present application, the positioning module 103 may be an existing component, such as a satellite positioning chip, which outputs positioning information according to a satellite positioning signal. The positioning information obtained by the positioning module 103 includes a positioning result coordinate, a satellite number for transmitting a satellite positioning signal, a signal carrier-to-noise ratio corresponding to each satellite number, and the like. The signal carrier-to-noise ratio represents the relationship between the carrier and the carrier noise, and the larger the signal carrier-to-noise ratio is, the better the received signal quality is.

It can be understood that, if the positioning information determined by the positioning module 103 includes the coordinate information of the positioning result, it indicates that the current positioning module 103 can successfully position according to the first radio frequency signal, that is, there may be no interference signal or the interference signal is weak in the current radio frequency signal. If the positioning information does not include the coordinate information of the positioning result, it indicates that the positioning module 103 cannot perform positioning according to the first radio frequency signal, that is, the strength of the interference signal in the current radio frequency signal is high, so that the positioning module cannot obtain the positioning coordinate. Furthermore, environmental influences may also result in the positioning module not being able to obtain the positioning coordinates, for example, in tunnels, in the middle of high-rise buildings, under overpasses or viaducts, in underground parking lots, etc., which may affect the reception of the satellite positioning signals, while weather conditions may also affect the reception of the satellite positioning signals.

Next, the operation of the control module 105 will be described separately for the above two cases.

In some embodiments of the present application, if the positioning information includes positioning success information, that is, when the positioning information includes positioning coordinate information, the control module 105 determines whether there is interference information in the radio frequency signal according to the positioning information of the satellite positioning signal and the power of the radio frequency signal, and the implementation manner may be as follows:

acquiring an average signal carrier-to-noise ratio according to the signal carrier-to-noise ratio corresponding to each satellite;

judging whether the average signal carrier-to-noise ratio is larger than a preset signal carrier-to-noise ratio threshold value or not;

determining that no interference signal exists in the radio frequency signal in response to the average signal carrier-to-noise ratio being greater than the signal carrier-to-noise ratio threshold;

responding to the fact that the average signal carrier-to-noise ratio is smaller than or equal to the signal carrier-to-noise ratio threshold value, and judging whether the power of the radio frequency signal is smaller than a preset power threshold value within a preset time period;

responding to the fact that the power of the radio frequency signal is smaller than a power threshold value in a preset time period, and determining that no interference signal exists in the radio frequency signal;

and responding to the power of the radio frequency signal being larger than or equal to the power threshold value in the preset time period, and determining that the interference signal exists in the radio frequency signal.

The average signal carrier-to-noise ratio may be calculated by summing signal carrier-to-noise ratios corresponding to all satellites and then averaging, may also be calculated by averaging carrier-to-noise ratios corresponding to a plurality of satellites with the strongest signal carrier-to-noise ratios, or may also be calculated by other averaging methods, which is not limited in this application.

It should be noted that, in the embodiment of the present application, the preset signal-to-carrier-noise ratio threshold and the preset power threshold are set according to the use environment, the parameter characteristics of each device in the apparatus, the insertion loss, and the like, and multiple experiments may be performed according to actual situations to obtain the optimal setting value.

The power of the radio frequency signal is smaller than the power threshold value within a preset time period, which is equivalent to the power of the radio frequency signal being smaller than the power threshold value within a continuous time period, wherein the preset time period can be set according to actual conditions.

In other embodiments of the present application, if the positioning information includes positioning failure information, that is, the positioning information does not include positioning coordinate information, the control module 105 determines whether there is an interference signal in the radio frequency signal according to the positioning information of the satellite positioning signal and the power of the radio frequency signal:

judging whether the power of the radio frequency signal is smaller than a preset power threshold value within a preset time period;

responding to the fact that the power of the radio frequency signal is smaller than a power threshold value in a preset time period, and determining that no interference signal exists in the radio frequency signal;

and responding to the power of the radio frequency signal being larger than or equal to the power threshold value in the preset time period, and determining that the interference signal exists in the radio frequency signal.

When the power of the radio frequency signal is smaller than the power threshold within the preset time period, it is indicated that the received radio frequency signal strength is very weak, that is, the satellite positioning signal strength in the received radio frequency signal is also very weak, which may be because the environment hinders the reception of the radio frequency signal, so that the positioning module cannot obtain the positioning coordinate signal according to the satellite positioning signal in the radio frequency signal.

Further, in some embodiments of the present application, the control module 105 is further configured to:

and when the interference signal exists in the radio frequency signal, determining the strength of the interference signal in the radio frequency signal according to the power of the radio frequency signal. That is, when it is determined that an interference signal exists in the radio frequency signal, the strength of the interference signal is the power of the current radio frequency signal.

It should be noted that, in the embodiment of the present application, the interference detection apparatus for satellite positioning signals may be connected to an output device, and used for outputting satellite interference information. For example, the device is connected with a display screen, interference information data is transmitted to the display screen, and information such as satellite positioning signals and interference signals is visually displayed. In addition, the device can be connected with a wireless transmission module to transmit data of satellite positioning signals and interference information to the background, so that the background can mark information such as coordinates, signal carrier-to-noise ratios and interference signal lightness on a map, and further can quickly determine characteristics such as an interference area, shape and size of the interference area through the map.

According to the interference detection device of the satellite positioning signal, the positioning information of the satellite positioning signal and the power of the radio frequency signal are obtained through the positioning module and the power detection module, whether the interference signal exists in the radio frequency signal is judged through the control module according to the positioning information of the satellite positioning signal and the power of the radio frequency signal, therefore, the interference detection of the satellite positioning signal is achieved, the implementation cost is low, the complexity of the interference signal detection in the satellite positioning signal can be reduced, and the strong practicability is achieved. In addition, aiming at the condition that the radio frequency signal has interference, the strength of the interference signal can be determined according to the power detection module, and a reference basis is further provided for searching an interference signal source.

Based on the above embodiment, in order to further improve the interference detection effect of the satellite positioning signal, filtering and amplification processing may be performed on the acquired radio frequency signal. In view of the above, the present application proposes another embodiment. Fig. 2 is a block diagram of another interference detection apparatus for satellite positioning signals according to an embodiment of the present disclosure. As shown in fig. 2, on the basis of fig. 1, the apparatus further includes: a first band pass filter 206 and a first low noise amplifier 207.

The first band-pass filter 206 is configured to perform band-pass filtering processing on the radio-frequency signal to obtain a first filtered radio-frequency signal;

the first low noise amplifier 207 is configured to amplify the first filtered radio frequency signal to obtain a first amplified radio frequency signal;

in this embodiment, the power divider 202 may be configured to divide the first amplified rf signal into a first rf signal and a second rf signal.

Optionally, to improve the received signal strength and improve the detection effect of the power detection module, as shown in fig. 2, on the basis of that shown in fig. 1, the apparatus may further include: a second band pass filter 208 and a second low noise amplifier 209.

The second band-pass filter 208 is configured to perform band-pass filtering processing on the second channel of radio frequency signal to obtain a second filtered radio frequency signal;

the second low noise amplifier 209 is configured to amplify the second filtered radio frequency signal to obtain a second amplified radio frequency signal;

in this embodiment, the power detection module 204 is configured to determine the power of the rf signal according to the second amplified rf signal.

In order to make the operating principle of the control module easier to understand, the determination of the interference signal by the control module will be described in an exemplary manner. The device shown in fig. 2 is exemplified according to the situation that the antenna gain is 0dB, the out-of-band rejection of the first band-pass filter is-40 dB, the out-of-band rejection of the second band-pass filter is-40 dB, the amplification factor of the first low-noise amplifier is 20dB, the amplification factor of the second low-noise amplifier is 20dB, and the detection range of the power detection module is 10dBm to-85 dBm at an open outdoor position. For this example, the preset signal-to-carrier-to-noise ratio is 40, the preset power threshold is-70 dBm, and assuming that the preset time period is 1min, the working principle of the control module 205 is as follows:

for the situation that the positioning information contains the positioning coordinate information (positioning success)

(1) Taking the signal carrier-to-noise ratios of the three satellites with the strongest satellite carrier-to-noise ratio, and calculating the average value of the signal carrier-to-noise ratios to obtain an average signal carrier-to-noise ratio;

(2) if the average signal carrier-to-noise ratio is greater than 40, determining that no interference signal exists in the radio frequency signal, namely, the current satellite positioning signal is not interfered;

(3) if the average signal carrier-to-noise ratio is less than or equal to 40 and the power of the radio frequency signal is continuously less than-70 dBm within 1min, determining that no interference signal exists in the radio frequency signal;

(4) and if the average signal-to-noise ratio is less than or equal to 40 and the power of the radio frequency signal is continuously greater than or equal to-70 dBm within 1min, determining that an interference signal exists in the radio frequency signal and the interference strength of the interference signal is the power of the radio frequency signal.

(II) for the case that the positioning coordinate information is not available in the positioning information (positioning failure)

(1) If the power of the radio frequency signal is continuously less than-70 dBm within 1min, determining that no interference signal exists in the radio frequency signal, and the satellite signal possibly caused by the environment is weak;

(2) and if the power of the radio frequency signal is continuously greater than or equal to-70 dBm within 1min, determining that an interference signal exists in the radio frequency signal, and determining the interference strength of the interference signal as the power of the radio frequency signal.

It should be noted that 201 to 205 in fig. 2 have the same functional structures as 101 to 105 in fig. 1, and are not described herein again.

According to the interference detection device of the satellite positioning signal, the band-pass filter and the low-noise amplifier are introduced, the out-of-band radio frequency signal is filtered firstly, and then the out-of-band radio frequency signal is amplified, so that the receiving effect of the radio frequency signal can be enhanced, and the accuracy of the control module in judging the interference signal is improved.

Aiming at the device, the application also provides an interference detection method of the satellite positioning signal.

Fig. 3 is a flowchart of an interference detection method for satellite positioning signals according to an embodiment of the present disclosure. It should be noted that the method for detecting interference of a satellite positioning signal according to the embodiment of the present application can be applied to the apparatus for detecting interference of a satellite positioning signal according to the embodiment of the present application. As shown in fig. 3, the method includes:

step 301, acquiring a radio frequency signal. Wherein the radio frequency signals comprise at least satellite positioning signals.

As an example, in the embodiment of the present application, a radio frequency signal may be acquired through a satellite receiving antenna, where the radio frequency signal includes at least a satellite positioning signal and possibly an intra-frequency interference signal. The satellite positioning signal is transmitted by a satellite positioning system, wherein the satellite positioning system can be a GPS (global positioning system), a Beidou satellite positioning system and the like, and the application does not limit the satellite positioning system.

Step 302, determining positioning information of the satellite positioning signal and power of the radio frequency signal according to the radio frequency signal.

The positioning information of the satellite positioning signal includes positioning result coordinates, a satellite number from which the satellite positioning signal is transmitted, a signal carrier-to-noise ratio corresponding to each satellite number, and the like. The signal carrier-to-noise ratio represents the relationship between the carrier and the carrier noise, and the larger the signal carrier-to-noise ratio is, the better the received signal quality is.

Taking the apparatus shown in fig. 1 as an example, in the embodiment of the present application, the positioning information of the satellite positioning signal can be determined by sending the satellite radio frequency signal to the positioning module. In addition, the power of the rf signal may be measured by a power detection module. It should be noted that the positioning information of the satellite positioning signal and the power of the radio frequency signal may also be determined by other detection devices, which is not limited in this application.

Step 303, determining whether an interference signal exists in the radio frequency signal according to the positioning information of the satellite positioning signal and the power of the radio frequency signal.

It can be understood that if an interference signal exists in the radio frequency signal, the carrier-to-noise ratio of the satellite positioning signal is increased, and a situation that the positioning coordinate cannot be obtained occurs when a plurality of interferences are strong. In addition, the presence of interfering signals also affects the power of the received radio frequency signal. Therefore, whether the interference signal exists in the radio frequency signal can be judged according to the positioning information of the satellite positioning signal and the power of the radio frequency signal.

According to the interference detection method of the satellite positioning signal, whether the interference signal exists in the radio frequency signal is determined according to the positioning information and the power of the radio frequency signal by respectively acquiring the positioning information and the power of the satellite positioning signal, so that whether the satellite positioning signal is interfered can be judged.

In order to facilitate determination of the positioning signal and the power of the satellite positioning signal, the acquired satellite positioning signal may be divided into two paths, and therefore another method for detecting interference of the satellite positioning signal is provided in the embodiment of the present application.

Fig. 4 is a flowchart of another method for detecting interference of a satellite positioning signal according to an embodiment of the present application. As shown in fig. 4, the method includes:

step 401, acquiring a radio frequency signal, wherein the radio frequency signal at least includes a satellite positioning signal.

Step 402, dividing the radio frequency signal into a first path of radio frequency signal and a second path of radio frequency signal.

The first path of radio frequency signal and the second path of radio frequency signal are two paths of radio frequency signals which are completely the same as the original radio frequency signals.

It can be understood that, in order to obtain the positioning information of the satellite positioning signal and the power of the radio frequency signal, and to avoid mutual interference between the processes of generating the positioning information and obtaining the power, the radio frequency signal may be divided into two identical paths, one of which is used to determine the positioning information of the satellite positioning signal in the radio frequency signal, and the other is used to determine the power of the radio frequency signal.

As an example, in the embodiment of the present application, the power divider may be used to divide the acquired radio frequency signal into two paths. In the apparatus shown in fig. 1, after the radio frequency signal is obtained by the satellite receiving antenna, the radio frequency signal is divided into a first path of radio frequency signal and a second path of radio frequency signal by the power divider.

Step 403, determining positioning information of the satellite positioning signal according to the first path of radio frequency signal.

And step 404, determining the power of the radio frequency signal according to the second path of radio frequency signal.

Step 405, determining whether an interference signal exists in the radio frequency signal according to the positioning information of the satellite positioning signal and the power of the radio frequency signal.

It should be noted that 401 in fig. 4 is completely consistent with the implementation of 301 in fig. 3, and 405 in fig. 4 is completely consistent with the implementation of 303 in fig. 3, and the description thereof is omitted here.

In order to further explain how to determine that an interference signal exists in a radio frequency signal, embodiments of the present application introduce implementation manners of determining whether the interference signal exists in the radio frequency signal according to the positioning information and the power of the radio frequency signal of the satellite positioning signal, respectively, according to whether the positioning information includes the positioning coordinate information.

Fig. 5 is a flowchart of an interference signal detection method according to an embodiment of the present application. The detection method is applied to the case that the positioning information includes the positioning coordinate information, that is, the detection method is applied to the case that the positioning information includes the positioning success information. It can be understood that the positioning coordinate information can be obtained according to the received satellite positioning signal, which cannot indicate that the current satellite positioning signal is not interfered by the interference signal, and it may be that the strength of the interference signal is weak, and the acquisition of the positioning coordinate is not affected. As shown in fig. 5, the step of determining whether there is an interference signal in the radio frequency signal according to the positioning information of the satellite positioning signal and the power of the radio frequency signal may be implemented by:

step 501, obtaining an average signal carrier-to-noise ratio according to the signal carrier-to-noise ratios corresponding to the satellites.

The average signal carrier-to-noise ratio may be calculated by summing signal carrier-to-noise ratios corresponding to all satellites and then averaging, may also be calculated by averaging carrier-to-noise ratios corresponding to a plurality of satellites with the strongest signal carrier-to-noise ratios, or may also be calculated by other averaging methods, which is not limited in this application.

Step 502, determine whether the average signal-to-carrier-to-noise ratio is greater than a preset signal-to-carrier-to-noise ratio threshold.

The preset signal-to-carrier-to-noise ratio is related to the environment of the actual scene, parameters of each component used, and the like, and needs to be determined according to the actual application scene.

Step 503, in response to the average signal-to-carrier-to-noise ratio being greater than the signal-to-carrier-to-noise ratio threshold, determining that no interference signal exists in the radio frequency signal.

It can be understood that the larger the signal-to-carrier-to-noise ratio is, the smaller the carrier noise is, that is, the larger the signal-to-carrier-to-noise ratio is, the smaller the interference received by the satellite positioning signal is, when the average signal-to-carrier-to-noise ratio is greater than the signal-to-carrier-to-noise ratio threshold, it may be determined that the satellite positioning signal is not interfered, that is, it may be determined that no interference signal exists in the received radio frequency signal.

Step 504, in response to the average signal-to-carrier-to-noise ratio being less than or equal to the signal-to-carrier-to-noise ratio threshold, determining whether the power of the radio frequency signal is less than a preset power threshold within a preset time period.

It can be understood that if the average signal-to-carrier-to-noise ratio is less than or equal to the signal-to-carrier ratio threshold, it indicates that the carrier noise in the current satellite positioning signal is larger, which may be due to the presence of the interference signal or due to the fact that the received satellite positioning signal is weaker, and then the carrier noise needs to be further determined according to the power of the radio frequency signal.

The preset power threshold is related to the environment of the actual scene, parameters of each component used, and the like, and needs to be determined according to the actual application scene.

And 505, in response to that the power of the radio frequency signal is smaller than a power threshold value within a preset time period, determining that no interference signal exists in the radio frequency signal.

The power of the radio frequency signal is smaller than the power threshold value within a preset time period, which is equivalent to the power of the radio frequency signal being smaller than the power threshold value within a continuous time period, wherein the preset time period can be set according to actual conditions. It can be understood that the power of the radio frequency signal is smaller, which indicates that the received radio frequency signal is weaker in strength, and also indicates that the received satellite positioning signal is weaker in strength, so that the signal carrier-to-noise ratio is smaller, and thus it can be determined that the currently received satellite positioning signal is not interfered, but the received signal is weaker in strength, so that the signal carrier-to-noise ratio is smaller.

Step 506, in response to the power of the radio frequency signal being greater than or equal to the power threshold value within the preset time period, determining that an interference signal exists in the radio frequency signal.

It can be understood that if the carrier-to-noise ratio of the received satellite positioning signal is smaller, it indicates that the current satellite positioning signal is weaker, or the noise in the received signal is larger, and because the frequency of the radio frequency signal is greater than or equal to the power threshold value within the preset time period, it indicates that the intensity of the current radio frequency signal is larger, so that it can be determined that an interference signal exists in the radio frequency signal, and the intensity of the received radio frequency signal is larger due to the existence of the interference signal. Therefore, in the embodiment of the present application, if the power of the radio frequency signal is greater than or equal to the power threshold within the preset time period, it may be determined that an interference signal exists in the radio frequency signal.

In addition, in the embodiment of the present application, when it is determined that an interference signal exists in the radio frequency signal, the strength of the interference signal in the radio frequency signal may also be determined according to the power of the radio frequency signal. That is, when it is determined that an interfering signal is present in the radio frequency signal, the strength of the interfering signal is the power of the radio frequency signal.

According to the interference detection method for the satellite positioning signal, provided by the embodiment of the application, aiming at the situation of successful positioning, the carrier-to-noise ratio of the satellite positioning signal and the power of the radio frequency signal are combined to carry out analysis together, and aiming at the radio frequency signal with smaller signal carrier-to-noise ratio and larger power, the existence of the interference signal is determined, so that the effectiveness of interference information judgment is improved. In addition, the strength of the interference signal can be determined according to the power of the radio frequency signal, so that the interference signal source can be further searched conveniently.

Fig. 6 is a flowchart of another interference signal detection method according to an embodiment of the present application. The detection method is applied to a case where the positioning information does not include the positioning coordinate information, that is, the detection method is applied to a case where the positioning information includes the positioning failure information. As shown in fig. 6, the step of determining whether there is an interference signal in the radio frequency signal according to the positioning information of the satellite positioning signal and the power of the radio frequency signal may be implemented by:

step 601, determining whether the power of the radio frequency signal is smaller than a preset power threshold value within a preset time period.

It should be noted that there are various reasons for the situation that the positioning fails according to the satellite positioning signal, and it may be that the satellite positioning signal is affected by the interference signal, so that the positioning coordinate information cannot be obtained according to the satellite positioning signal in the received radio frequency signal; it is also possible that the reception of the radio frequency signals, and thus the satellite positioning signals, may be affected for environmental reasons, e.g. in tunnels, in the middle of high-rise buildings, under overpasses or viaducts, in underground parking lots, etc. Weather conditions also affect the reception of satellite positioning signals. Therefore, in the embodiment of the present application, in order to further determine whether an interference signal exists in the radio frequency signal, the determination needs to be performed according to the power of the radio frequency signal.

Step 602, in response to that the power of the radio frequency signal is smaller than a power threshold value within a preset time period, determining that no interference signal exists in the radio frequency signal;

it will be appreciated that if the rf signal is affected by environmental factors, the received rf signal may be weak. In the embodiment of the present application, if the power of the radio frequency signal is smaller than the power threshold within the preset time period, it indicates that the current radio frequency signal strength is weak, and also indicates that the current satellite positioning signal strength is weak, that is, because the received satellite positioning signal strength is weak, the positioning fails, so that the satellite positioning signal is currently influenced by the environment, the reception of the satellite positioning signal is hindered, and no interference signal exists.

Step 603, in response to that the power of the radio frequency signal is greater than or equal to the power threshold value within a preset time period, determining that an interference signal exists in the radio frequency signal.

It can be understood that if the received radio frequency signal has a strong strength, but the positioning coordinate information cannot be obtained according to the satellite positioning signal in the received radio frequency signal, it indicates that an interference signal exists in the received radio frequency signal, so that the satellite positioning signal therein is interfered, and the positioning coordinate information cannot be obtained. In the embodiment of the present application, if the power of the radio frequency signal is greater than or equal to the power threshold within the preset time period, it indicates that the strength of the currently received radio frequency signal is strong, so as to determine that the radio frequency signal has an interference signal.

In addition, in the embodiment of the present application, in order to enhance the receiving effect of the satellite positioning signal and improve the effectiveness of interference detection, the positioning information and the power may be determined after the received radio frequency signal is subjected to bandpass filtering and amplification. As an example, the interference detection apparatus for satellite positioning signals shown in fig. 2 passes a received radio frequency signal through a band pass filter and a low noise amplifier, and then enters a power divider. In addition, in order to improve the power detection effect, the rf signal may be filtered and amplified once by a band-pass filter and a low noise amplifier before the power detection.

According to the interference detection method of the satellite positioning signal, the positioning failure and the positioning success are divided into two judgment logics, whether the interference signal exists is judged according to the power intensity of the received radio frequency signal aiming at the positioning failure condition, the condition that the misjudgment of the interference signal can occur due to the judgment only according to the positioning failure information can be avoided, and the accuracy of the interference detection of the satellite positioning signal is further improved.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.