阅读说明：本技术 应用于卫星信号捕获的检测方法及装置 (Detection method and device applied to satellite signal acquisition ) 是由 宋挥师 刘晓燕 徐雄伟 赵海龙 于 2020-12-22 设计创作，主要内容包括：本文公开了一种应用于卫星信号捕获的检测方法及装置,包括：根据预先设定的捕获门限及开除门限对当前搜索单元的此轮搜索进行检测判决；在根据所述捕获门限判定当前搜索单元的此轮搜索捕获成功时进行累加计数,在所述累加计数的值达到预设的最大值时,停止计数并判定为当前搜索单元成功捕获到当前卫星信号；在根据所述开除门限判定当前搜索单元的此轮搜索捕获失败时,将所述计数的值重置为预设的初始值,并转入下一搜索单元。本申请能够减少卫星信号捕获过程中的检测次数并缩短捕获时长。(The utility model discloses a detection method and a device applied to satellite signal acquisition, comprising: detecting and judging the round of search of the current search unit according to a preset capture threshold and a division threshold; performing accumulation counting when the search acquisition of the current search unit is successfully determined according to the acquisition threshold, and stopping counting and determining that the current search unit successfully acquires the current satellite signal when the value of the accumulation counting reaches a preset maximum value; and when the search capturing failure of the current search unit is judged according to the division threshold, resetting the counting value to a preset initial value, and transferring to the next search unit. The method and the device can reduce the detection times in the satellite signal capturing process and shorten the capturing time.)

1. A detection method applied to satellite signal acquisition, comprising:

detecting and judging the round of search of the current search unit according to a preset capture threshold and a division threshold;

when the acquisition threshold is used for judging that the search acquisition of the current search unit is successful, performing accumulated counting, and when the counted value reaches a preset maximum value, stopping counting and judging that the current search unit successfully acquires the current satellite signal;

and when the search capturing failure of the current search unit is judged according to the division threshold, resetting the counting value to a preset initial value, and transferring to the next search unit.

2. The detection method according to claim 1, further comprising:

and after the counting is accumulated, if the counted value does not reach the preset maximum value, judging that additional searching needs to be continued in the current searching unit.

3. The detection method according to claim 1 or 2, wherein the performing the detection decision on the current search of the search unit according to the preset capture threshold and the division threshold comprises:

comparing the detection value of the current search unit in the round of search with the capture threshold and the division threshold respectively;

when the detection value is not smaller than the capture threshold, judging that the round of search capture of the current search unit is successful; and when the detection value is smaller than the division threshold, judging that the round of search capture of the current search unit fails.

4. The detection method according to claim 3, wherein the performing the detection decision on the current search of the search unit according to the preset capture threshold and the division threshold further comprises: and when the detection value is smaller than the capture threshold but not smaller than the division threshold, keeping the current counting value unchanged, and judging that additional search needs to be continued in the current search unit.

5. The detection method according to claim 1, wherein the accumulating the count when the round of search acquisition of the current search unit is determined to be successful comprises: the value of the current count is incremented by 1 when it is determined that this round of search acquisition for the current search unit is successful.

6. A detection apparatus for use in satellite signal acquisition, comprising:

the first comparator is used for carrying out detection judgment on the round of search of the current search unit according to a preset capture threshold;

the second comparator is used for carrying out detection judgment on the round of search of the current search unit according to a preset division threshold;

the counter is used for carrying out accumulated counting when the first comparator judges that the round of search acquisition of the current search unit is successful, and stopping counting when the counted value reaches a preset maximum value so as to indicate that the current search unit successfully acquires the current satellite signal; and when the second comparator judges that the current search unit fails in the round of search capture, resetting the value of the count to a preset initial value to indicate to shift to the next search unit.

7. The apparatus according to claim 6, wherein the counter is further configured to keep the current state if the value of the count does not reach a preset maximum value after the first comparator determines that the round of search acquisition of the current search unit is successful, so as to indicate that additional search needs to be continued in the current search unit.

8. The capturing device of claim 6,

the first comparator is specifically configured to compare the detection values of the current search unit in the round of search with the capture thresholds respectively; when the detection value is not smaller than the capture threshold, judging that the round of search capture of the current search unit is successful;

the second comparator is specifically configured to compare the detection values of the current search unit in the round of search with the division threshold respectively; and when the detection value is smaller than the division threshold, judging that the round of search capture of the current search unit fails.

9. The capturing device of claim 6,

the first comparator is specifically configured to send the detection value to the second comparator when the detection value is smaller than the capture threshold;

the second comparator is specifically configured to determine that additional search needs to be continued in the current search unit when the detection value is not greater than the division threshold;

the counter is further configured to keep a current count value unchanged when the second comparator determines that additional search is necessary in the current search means.

10. A navigation receiver, characterized in that it comprises detection means for satellite signal acquisition as claimed in any one of claims 6 to 9.

Technical Field

The present invention relates to the field of navigation technologies, and in particular, to a detection method and apparatus applied to satellite signal acquisition.

Background

Navigation technology plays an important role in the development process of human history, and along with the continuous progress of society, the technology, particularly satellite navigation positioning technology, is more and more closely related to the life of people. Currently, the main Satellite NAvigation systems in the world include a Global Positioning System (GPS), a BD2 (the second beidou), a Global NAvigation Satellite System (GLONASS), and a Galileo (Galileo) Satellite NAvigation System. Both GPS and BD2 use CDMA (Code Division Multiple Access) technology, and the physical layer frame structures thereof are much similar, so that the receiver design is similar, including rf front end processing, baseband digital signal processing, and positioning navigation operations. The baseband digital signal processing process generally includes acquisition, tracking, bit synchronization, frame synchronization, and the like.

The acquisition process of the satellite navigation receiver to the satellite signal includes frequency mixing, correlation operation, coherent integration/non-coherent integration and decision, and the principle of navigation signal acquisition is shown in fig. 1. The decision device compares the detected quantity obtained by the previous operation with the decision threshold, thereby deciding whether the capturing is successful or not. However, due to the existence of noise, interference and the like, the detection amount of the signal on the searching unit is sometimes weakened, and the detection amount of other searching units sometimes has a peak value, so that detection omission or false alarm phenomena are caused. Thus, the navigation receiver should not immediately switch from the acquisition state to the next state after a successful decision on a search unit, but should continue to acknowledge the search unit. That is, a confirmation mechanism needs to be added during the acquisition process.

Since the detection method in satellite signal acquisition affects the Time To First Fix (TTFF) of the receiver to a large extent, a better signal acquisition detection method should have less linger time. In the acquisition including the confirmation mechanism in the related art, the time performance of the satellite signal acquisition detection is not ideal, and not only the detection times are large, but also the acquisition time is long.

Disclosure of Invention

The invention provides a detection method and a detection device applied to satellite signal acquisition, which can at least reduce the detection times.

The present application provides the following technical solutions.

A detection method applied to satellite signal acquisition, comprising:

detecting and judging the round of search of the current search unit according to a preset capture threshold and a division threshold;

when the acquisition threshold is used for judging that the search acquisition of the current search unit is successful, performing accumulated counting, and when the counted value reaches a preset maximum value, stopping counting and judging that the current search unit successfully acquires the current satellite signal;

and when the search capturing failure of the current search unit is judged according to the division threshold, resetting the counting value to a preset initial value, and transferring to the next search unit.

Wherein the method further comprises: and after the counting is accumulated, if the counted value does not reach the preset maximum value, judging that additional searching needs to be continued in the current searching unit.

The detecting and judging the round of search of the current search unit according to the preset capture threshold and the division threshold comprises the following steps: comparing the detection value of the current search unit in the round of search with the capture threshold and the division threshold respectively; when the detection value is not smaller than the capture threshold, judging that the round of search capture of the current search unit is successful; and when the detection value is smaller than the division threshold, judging that the round of search capture of the current search unit fails.

The detecting and judging the round of search of the current search unit according to the preset capture threshold and the division threshold further comprises: and when the detection value is smaller than the capture threshold but not smaller than the division threshold, keeping the current counting value unchanged, and judging that additional search needs to be continued in the current search unit.

Wherein, the performing accumulated counting when the search acquisition of the current search unit is determined to be successful comprises: the value of the current count is incremented by 1 when it is determined that this round of search acquisition for the current search unit is successful.

A detection apparatus for use in satellite signal acquisition, comprising:

the first comparator is used for carrying out detection judgment on the round of search of the current search unit according to a preset capture threshold;

the second comparator is used for carrying out detection judgment on the round of search of the current search unit according to a preset division threshold;

the counter is used for carrying out accumulated counting when the first comparator judges that the round of search acquisition of the current search unit is successful, and stopping counting when the counted value reaches a preset maximum value so as to indicate that the current search unit successfully acquires the current satellite signal; and when the second comparator judges that the current search unit fails in the round of search capture, resetting the value of the count to a preset initial value to indicate to shift to the next search unit.

The counter is further configured to keep the current state if the counted value does not reach a preset maximum value after the first comparator determines that the round of search capture of the current search unit is successful, so as to indicate that additional search needs to be continued in the current search unit.

The first comparator is specifically configured to compare the detection values of the current search unit in the round of search with the capture thresholds respectively; when the detection value is not smaller than the capture threshold, judging that the round of search capture of the current search unit is successful;

the second comparator is specifically configured to compare the detection values of the current search unit in the round of search with the division threshold respectively; and when the detection value is smaller than the division threshold, judging that the round of search capture of the current search unit fails.

The first comparator is specifically configured to send the detection value to the second comparator when the detection value is smaller than the capture threshold; the second comparator is specifically configured to determine that additional search needs to be continued in the current search unit when the detection value is not greater than the division threshold; the counter is further configured to keep a current count value unchanged when the second comparator determines that additional search is necessary in the current search means.

A navigation receiver comprising detection means as described above for use in satellite signal acquisition.

The advantages of the present application include at least:

in the embodiment of the invention. A double-threshold judgment mode is introduced in the acquisition and detection of satellite signals, so that the detection times are effectively reduced.

In the embodiment of the invention, when the current search unit is judged to be failed to capture, the counter is reset to the initial value and then switched to the next search unit, the counter only counts when the current search unit is successfully captured in the round of search, and the counter can be applied to the detection judgment of each search unit without repeatedly switching between addition and subtraction, so that the counting oscillation can be avoided, the capture time is shortened, and the detection performance is improved.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic diagram of a navigation signal acquisition principle;

FIG. 2 is a flow chart illustrating a process of an M strategy of N in the related art;

FIG. 3 is a schematic diagram of a process flow of Tong detection in the related art;

fig. 4 is a flowchart illustrating a detection method applied to satellite signal acquisition according to a first embodiment;

FIG. 5 is a schematic view of an exemplary process flow of the detection method according to the first embodiment;

FIG. 6 is a flowchart illustrating an exemplary process of a detection method according to an embodiment;

fig. 7 is a schematic structural diagram of a detection apparatus applied to satellite signal acquisition according to a second embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.

In the related art, the capture algorithm including the confirmation mechanism can be generally classified into two types, a fixed search time method and a variable search time method. The fixed search time method is characterized in that a receiver searches for a preset fixed time on each search unit in total, and then judges whether the acquisition is successful or not according to the multiple search results of the search units in the time period, wherein the judgment represents that the algorithm has an M algorithm of N; the variable search time method is that a receiver may search for an unequal time on each search unit according to a certain rule and in combination with the detection situation at the time, and the overall acquisition performance of the variable search time method generally needs to be better than that of the fixed search time method, which represents that the algorithm is the Tong algorithm.

The following describes a detection strategy of an acquisition algorithm including a confirmation mechanism in the related art.

1, capture detection strategy of M out of N (hereinafter referred to as M strategy of N).

In the M strategy of N, a search unit is searched for N times, and for single judgment, if the detection quantity V exceeds the threshold, the value M of the counter is added with 1. If N searches have been completed and the number of successful times is not less than M, it is considered that acquisition is successful in the frequency interval, otherwise, acquisition is failed, and the flow is shown in fig. 2. The M-of-N strategy is a detection strategy with a fixed number of searches, and thus the detection performance is inferior to the Tong capture detection strategy of the variable search time method.

Tong capture detection strategy.

The Tong capture detection strategy is a linear search method in the form of variable search time, which is basically to add more search time to search units that are difficult to determine whether the signal is captured successfully or not, and the flow is shown in fig. 3. Under the condition of low carrier-to-noise ratio, particularly when the single detection probability is close to 0.5, the K value can repeatedly oscillate between plus 1 and minus 1, so that the detection times are more, and the calculation amount is greatly increased.

Since the detection method in satellite signal acquisition affects the Time To First Fix (TTFF) of the receiver to a large extent, a better signal acquisition detection method should have less linger time. As can be seen from the above analysis, the time performance of the satellite signal acquisition and detection in the related art is not ideal, and not only the number of detections is large, but also the acquisition time is long. In order to solve the problem, the application provides the following technical scheme, the technical scheme uses double decision thresholds to realize detection in satellite signal capture, can avoid counting oscillation, reduce capture time, improve detection performance and reduce detection times.

The following describes in detail an implementation of the technical solution of the present application.

Example one

As shown in fig. 3, a detection method applied to satellite signal acquisition may include:

step 301, detecting and judging the round of search of the current search unit according to a preset capture threshold and a division threshold;

step 302, performing accumulation counting when the search acquisition of the current search unit is successfully performed according to the acquisition threshold, stopping counting when the counted value reaches a preset maximum value, and determining that the current search unit successfully acquires the current satellite signal;

step 303, when it is determined that the search capturing of the current search unit in the round fails according to the division threshold, resetting the counted value to a preset initial value, and transferring to the next search unit.

In this embodiment, after the count is accumulated when it is determined that the search acquisition of the current search unit is successful, and the value of the count does not reach the preset maximum value, it is determined that additional search needs to be continued in the current search unit.

In this embodiment, the detecting and determining the round of search of the current search unit according to the preset capture threshold and the division threshold may include: comparing the detection value of the current search unit in the round of search with the capture threshold and the division threshold respectively; when the detection value is not smaller than the capture threshold, judging that the round of search capture of the current search unit is successful; and when the detection value is smaller than the division threshold, judging that the round of search capture of the current search unit fails.

Here, the method may further include: and when the detection value is smaller than the capture threshold but not smaller than the division threshold, keeping the current counting value unchanged, and judging that additional search needs to be continued in the current search unit. In other words, when the detection value is smaller than the capture threshold but not smaller than the division threshold, no counting is performed, and the current counted value is kept unchanged. For example, if the counted value is 3 before the decision is made for the round of search of the current search unit, the counted value still remains 3 when the detection value for the round of search of the current search unit is smaller than the capture threshold but not smaller than the division threshold.

In this embodiment, the performing accumulated counting when it is determined that the search acquisition of the current search unit in the round is successful may include: the value of the current count is incremented by 1 when it is determined that this round of search acquisition for the current search unit is successful. In practical application, binary counting or other counting modes can be adopted, and a proper counter can be freely selected according to needs. Before counting, an initial value, a maximum value, and the like thereof may be previously configured in the counter, and the above-described processing related to counting may be realized by the counter in the detection process.

In this embodiment, the initial value (hereinafter referred to as the initial value) and the maximum value at the time of counting can be freely set according to different practical application scenarios, and different initial values and different maximum values can be configured at the time of counting for different types of satellite signals in a specific application. For example, the initial value at the time of counting may be set to 0. The maximum value for counting may be set by statistically analyzing the acquisition of the satellite signal, or may be an empirical value. The specific values of the initial value and the maximum value in counting are not limited herein.

It should be noted that. In this embodiment, the capture threshold and the division threshold are respectively an upper limit and a lower limit of a detection value (the detection value may be an amplitude value or an energy value of a signal obtained when integration is finished after a current search unit is searched, and the energy value may be represented as a square of the amplitude value of the signal). This is not a limitation herein.

Fig. 5 is an exemplary processing flow of the present embodiment, wherein a dual threshold searcher (not shown) is corresponding to each related branch of a pair of I and Q branches, and the dual threshold searcher (corresponding to a detection device applied to satellite signal acquisition described below) mainly includes an amplitude comparator 1 (corresponding to a first comparator described below), an amplitude comparator 2 (corresponding to a second comparator described below), and a counter. Two amplitude comparators respectively corresponding to a capture threshold V_H(high threshold) and a division threshold V_L(Low threshold). Wherein, the capture threshold V_HThe amplitude value is the lower limit which can be judged as the current capturing success, namely the capturing success of the round can be judged at least when the threshold is reached; division threshold V_LThe acquisition failure is determined as the current acquisition failure, namely the acquisition failure of the round can be determined as long as the acquisition failure is less than the threshold; the counter counts the number of times of successful acquisition for one search unit, and the value of the counter is increased by 1 for each successful acquisition of one search unit.

As shown in fig. 5, the exemplary process may include: when the receiver starts to search signals in a certain search unit, the value of the counter is preset to be an initial value; then, toThe search unit performs a search, after each integration of the current signal is finished, a detection value obtained by the integration is entered into the amplitude comparator 1, and the amplitude comparator 1 is based on the detection value and the capture threshold V_HIf the determination is successful, the counter value is incremented by 1. Then, whether the counter reaches a preset maximum value is checked, and counting is stopped when the counter reaches the preset maximum value so as to determine whether the search of the current search unit needs to be continued. If the current counter stops counting, the receiver is declared to have successfully acquired the current satellite signal in the current search unit, and the two-dimensional search is also ended; if the counter has not stopped after the search round (i.e., the preset maximum value has not been reached), the receiver continues to perform additional searches in the current search unit. After entering the amplitude comparator 1, if it is determined that the failure has occurred, the operation further proceeds to the amplitude comparator 2. The amplitude comparator 2 divides the threshold V based on the above detection value_LPerforming detection judgment, and if the amplitude comparator 2 judges that the detection is successful, additionally searching in the current searching unit; if the amplitude comparator 2 judges that the acquisition of the satellite signal in the current search unit fails, the receiver judges that the acquisition of the satellite signal in the current search unit fails, resets the counter to an initial value, switches to the next search unit to continue searching and executes the processing.

Firstly, the present embodiment introduces a double-threshold decision manner in the acquisition and detection of the satellite signal, that is, the double-threshold is adopted to realize the acquisition and detection, thereby effectively reducing the detection times. Secondly, in the embodiment, when the current search unit is judged to be failed to capture, the counter is reset to the initial value and then switched to the next search unit, the counter only counts when the current search unit is successfully captured in the round of search, and the counter can be applied to detection judgment of each search unit without repeatedly switching between addition and subtraction, so that counting oscillation can be avoided, the capture duration is shortened, and the detection performance is improved.

The following illustrates a specific implementation of the method of the present embodiment. It should be noted that the following examples are only exemplary implementations of the method of the present embodiment. In practical applications, the specific implementation manner of the method of this embodiment is not limited to this, and other specific implementation manners may be adopted in specific applications in combination with specific application scenarios.

Example 1

As shown in fig. 6, the detection procedure for acquiring satellite signals in this example may include:

step 600, when the receiver starts to search signals in a certain search unit, presetting a variable K of a counter as an initial value 0;

step 601, after the receiver searches in the current search unit, after finishing the integration of the signal (i.e. calculating the signal amplitude) each time, comparing the detection quantity V with the capture threshold V_HIf V exceeds or equals to the capture threshold 606V_HStep 602 is entered; if V is less than the capture threshold V_HThen go to step 606;

step 602, adding 1 to the K value;

step 603, check the size of the K value to determine whether the search of the current search unit needs to be continued. If the value of the current K after the previous accumulation is equal to the maximum value a, go to step 604, if the value of the current K is smaller than the maximum value a, go to step 605,

step 604, declaring that the receiver has successfully acquired the current satellite signal in the current search unit, and then the two-dimensional search is also ended;

step 605, the receiver continues additional search in the current search unit and returns to step 601;

step 606, the detected quantity V and the division threshold V are compared_LComparing; if V exceeds or equals to the division threshold V_LReturning to step 605, continuing to perform additional search in the current search unit; if V is less than the division threshold V_LThen go to step 607;

in step 607, the receiver determines that the acquisition of the signal in the current search unit fails but the signal is not acquired yet, switches to the next search unit to continue the search, returns to step 600, resets the variable K of the counter to the initial value 0, and repeats the process for the next search unit.

The method of the present embodiment is applicable to a navigation receiver, and in particular, can be implemented by a baseband digital signal processing module. In one implementation, the above method of the present embodiment can be applied to acquisition of GPS satellite signals.

Example two

A detection apparatus applied to satellite signal acquisition, as shown in fig. 7, may include:

a first comparator 71, configured to perform detection and decision on the current search round of the search unit according to a preset capture threshold;

a second comparator 72, configured to perform detection and decision on the round of search of the current search unit according to a preset division threshold;

a counter 73 for counting up when the first comparator determines that the current search unit is successful in the round of search acquisition, and stopping counting when the counted value reaches a preset maximum value, so as to indicate that the current search unit is successful in acquiring the current satellite signal; and when the second comparator judges that the current search unit fails in the round of search capture, resetting the value of the count to a preset initial value to indicate to shift to the next search unit.

In this embodiment, the counter 73 may be further configured to keep the current state (i.e., the state without stopping counting) when the counted value does not reach the preset maximum value, so as to indicate that additional search needs to be continued in the current search unit. In other words, the counter 73 can also be used to keep the working state (i.e. the state of not stopping counting) when the counted value does not reach the preset maximum value after the first comparator counts when the round of search capturing of the current search unit is determined to be successful, so as to indicate that additional search needs to be continued at the current search unit.

In this embodiment, the first comparator 71 is specifically configured to compare the detection values of the current search unit in the round of search with the capture thresholds respectively; when the detection value is not smaller than the capture threshold, judging that the round of search capture of the current search unit is successful; the second comparator 72 is specifically configured to compare the detection values of the current search unit in the round of search with the division thresholds respectively; and when the detection value is smaller than the division threshold, judging that the round of search capture of the current search unit fails.

Here, the first comparator 73 is specifically configured to send the detection value to the second comparator when the detection value is smaller than the capture threshold; the second comparator 74 is specifically configured to determine that additional search needs to be continued in the current search unit when the detected value is not greater than the division threshold; the counter 73 may be configured to keep a current count value unchanged when the second comparator determines that additional search is necessary in the current search means. In other words, when the detection value is smaller than the capture threshold but not smaller than the division threshold, no counting is performed, and the current counted value is kept unchanged. For example, if the count value of the counter is 3 before the decision is made on the search round of the current search unit, the count value of the counter is still maintained to be 3 when the detection value of the search round of the current search unit is smaller than the capture threshold but not smaller than the division threshold.

In this embodiment, the counter 73 is configured to count when it is determined that the search acquisition of the current search unit in the round is successful, and may include: the value of the current count is incremented by 1 when it is determined that this round of search acquisition for the current search unit is successful. In practical application, the counter can be various types such as a binary counter, a decimal counter and the like, and can be freely selected according to needs.

It should be noted that, in the present embodiment, the initial value (hereinafter referred to as the initial value) and the maximum value of the counter can be freely set according to different practical application scenarios, and different initial values and maximum values can be configured for different types of satellite signals in a specific application. For example, the initial value of the counter may be set to 0. The maximum value of the counter may be set by statistically analyzing the acquisition of the satellite signal, or may be an empirical value. The initial value of the counter and the specific value of the maximum value are not limited herein.

It should be noted that. In this embodiment, the capture threshold and the division threshold are respectively an upper limit and a lower limit of a detection value (the detection value may be an amplitude value or an energy value of a signal obtained when integration is finished after a current search unit is searched, and the energy value may be represented as a square of the amplitude value of the signal). This is not a limitation herein.

In practical applications, the detection device applied to the satellite signal acquisition of the embodiment may be implemented by or disposed in a navigation receiver. In one implementation, the detection device may be implemented by a baseband digital signal processing module of the navigation receiver. The first comparator 71, the second comparator 72, and the counter 73 may be software, hardware, or a combination of the two. In one implementation, the detection device may be used as the decision device shown in fig. 1 or disposed in the decision device shown in fig. 1.

Other technical details of the present embodiment may refer to the first embodiment.

EXAMPLE III

The application also provides a navigation receiver, which comprises the detection device applied to satellite signal acquisition. Specific technical details can be found in reference to the first embodiment and the second embodiment.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.