阅读说明：本技术 一种频谱探测装置以及探测方法 (Frequency spectrum detection device and detection method ) 是由 何林 孟祥辉 梁晓卓 霍东华 于 2021-09-11 设计创作，主要内容包括：本申请涉及一种频谱探测装置以及探测方法,其中频谱探测装置包括信号接收端、可控混频单元、接收单元和处理单元；信号接收端用于接收待测信号；可控混频单元用于对待测信号进行单级混频,以输出混频输出信号；接收单元用于分析混频输出信号在预设频率范围内的部分,以输出混频输出信号在预设频率范围内的部分的频率值；处理单元分别连接可控混频单元和接收单元,用于获取混频输出信号在预设频率范围内的部分的频率值,并计算待测信号唯一的频率值；还用于在无法计算所述待测信号唯一的频率值时调节可控混频单元中与待测信号进行混频的信号的频率值。频谱探测装置能够对待测信号进行单级混频,减少了混频器的数量,使得频谱探测装置的体积缩小。(The application relates to a frequency spectrum detection device and a detection method, wherein the frequency spectrum detection device comprises a signal receiving end, a controllable frequency mixing unit, a receiving unit and a processing unit; the signal receiving end is used for receiving a signal to be detected; the controllable frequency mixing unit is used for carrying out single-stage frequency mixing on the signal to be detected so as to output a frequency mixing output signal; the receiving unit is used for analyzing the part of the mixing output signal in the preset frequency range so as to output the frequency value of the part of the mixing output signal in the preset frequency range; the processing unit is respectively connected with the controllable frequency mixing unit and the receiving unit and is used for acquiring the frequency value of part of the frequency mixing output signal in a preset frequency range and calculating the only frequency value of the signal to be measured; and the frequency value of the signal to be measured mixed with the signal to be measured in the controllable mixing unit is adjusted when the unique frequency value of the signal to be measured cannot be calculated. The frequency spectrum detection device can carry out single-stage frequency mixing on the signal to be detected, so that the number of frequency mixers is reduced, and the size of the frequency spectrum detection device is reduced.)

1. A spectrum sensing apparatus, characterized by: the device comprises a signal receiving end (1), a controllable frequency mixing unit (3), a receiving unit (4) and a processing unit (5);

the signal receiving end (1) is used for receiving a signal to be detected;

the controllable frequency mixing unit (3) is connected with the signal receiving end (1) and is used for carrying out single-stage frequency mixing on a signal to be detected so as to output a frequency mixing output signal;

the receiving unit (4) is connected with the controllable frequency mixing unit (3) and is used for receiving and analyzing the part of the frequency mixing output signal in the preset frequency range so as to output the frequency value of the part of the frequency mixing output signal in the preset frequency range;

the processing unit (5) is respectively connected with the controllable frequency mixing unit (3) and the receiving unit (4) and is used for acquiring the frequency value of part of the frequency mixing output signal in a preset frequency range and calculating the only frequency value of the signal to be detected so as to output a result signal; and is also used for adjusting the frequency value of the signal mixed with the signal to be measured in the controllable mixing unit (3) when the unique frequency value of the signal to be measured cannot be calculated.

2. The spectrum sensing apparatus of claim 1, wherein: the controllable frequency mixing unit (3) comprises a local oscillator signal generator (31) and a frequency mixer (32);

the local oscillator signal generator (31) is used for outputting local oscillator signals with different frequencies;

the frequency mixer (32) is respectively connected with the signal receiving end (1) and the local oscillation signal generator (31), and is used for receiving the signal to be measured and the local oscillation signal, and mixing the signal to be measured and the local oscillation signal to output a mixing output signal;

the processing unit (5) is connected with the local oscillator signal generator (31) and is used for adjusting the frequency of the local oscillator signal when the unique frequency value of the signal to be measured cannot be obtained through calculation.

3. The spectrum sensing apparatus of claim 2, wherein: the processing unit (5) is further configured to adjust the preset frequency range.

4. The spectrum sensing apparatus of claim 3, wherein: the device is characterized by further comprising a signal processing unit (2), wherein the signal processing unit (2) is connected with the signal receiving end (1) and the frequency mixer (32) and is used for processing the signal to be detected.

5. The spectrum sensing apparatus of claim 4, wherein: the frequency spectrum measuring device is characterized by further comprising a display unit (6), wherein the display unit (6) is connected with the processing unit (5) and used for displaying the frequency spectrum of the signal to be measured in real time according to the frequency value of the signal to be measured.

6. The spectrum sensing apparatus of claim 5, wherein: the processing unit (5) is connected with a power supply unit (7), an adjusting key (8) and a rotary encoder (9).

7. The spectrum sensing device of claim 6, wherein: the device also comprises a communication unit (10), wherein the communication unit (10) is connected with the processing unit (5).

8. A method of detecting a signal frequency, comprising the steps of:

acquiring frequency values of partial signals of a mixing output signal in a preset frequency range, wherein the mixing output signal is a signal obtained by mixing a signal to be detected received by a signal receiving end with a local oscillation signal;

and determining the frequency value of the signal to be detected according to the frequency value of the partial signal of the mixing output signal within the preset frequency range and the frequency value of the local oscillation signal.

9. The method according to claim 8, wherein the determining the frequency value of the signal to be measured according to the frequency value of the partial signal of the mixing output signal in the preset frequency range and the frequency value of the local oscillation signal comprises:

calculating the frequency value of the signal to be detected according to the frequency value of the partial signal of the mixing output signal within the preset frequency range and the frequency value of the local oscillation signal;

judging whether the frequency value of the signal to be detected is unique;

if not, adjusting the frequency value of the local oscillation signal, and determining the unique frequency value of the signal to be detected according to the change of the calculated frequency value of the signal to be detected.

10. The method of claim 8, further comprising a method of determining a frequency of a local oscillator signal:

and determining the frequency of the local oscillation signal according to the frequency range of the signal to be detected and a preset frequency range.

Technical Field

The present application relates to the field of spectrum analysis technologies, and in particular, to a spectrum detection apparatus and a detection method.

Background

The spectrum sensing device is capable of converting a received input signal from a time domain to a frequency domain and displaying spectral characteristics of the input signal in the frequency domain.

In the related art, an antenna receiving end, a mixing unit and a plurality of signal processing units are arranged in a spectrum detecting device. After the antenna receiving end receives the input signal, the plurality of signal processing units are used for carrying out processing such as filtering, amplitude limiting, attenuation and amplification on the input signal. And then, the frequency mixing unit carries out multi-stage frequency mixing on the processed input signals to obtain intermediate-frequency input signals, and a spectrogram corresponding to the input signals is displayed in a display screen after the intermediate-frequency input signals are detected.

However, since a plurality of mixing chips are required to realize multi-stage mixing, the spectrum sensing apparatus is inevitably bulky and thus inconvenient to carry.

Disclosure of Invention

In order to improve the portability of a spectrum sensing device, the application provides a spectrum sensing device, an automatic calibration device and a detection method.

In a first aspect, the present application provides a spectrum detecting apparatus, which adopts the following technical scheme:

a frequency spectrum detection device comprises a signal receiving end, a controllable frequency mixing unit, a receiving unit and a processing unit;

the signal receiving end is used for receiving a signal to be detected;

the controllable frequency mixing unit is connected with the signal receiving end and used for carrying out single-stage frequency mixing on the signal to be detected so as to output a frequency mixing output signal;

the receiving unit is connected with the controllable frequency mixing unit and used for receiving and analyzing the part of the frequency mixing output signal in the preset frequency range so as to output the frequency value of the part of the frequency mixing output signal in the preset frequency range;

the processing unit is respectively connected with the controllable frequency mixing unit and the receiving unit and is used for acquiring the frequency value of part of the frequency mixing output signal in a preset frequency range and calculating the only frequency value of the signal to be detected so as to output a result signal; and the frequency adjusting unit is also used for adjusting the frequency value of the signal which is mixed with the signal to be detected in the controllable frequency mixing unit when the unique frequency value of the signal to be detected cannot be calculated.

By adopting the technical scheme, the frequency spectrum detection device can carry out single-stage frequency mixing on the signal to be detected, and compared with multi-stage frequency mixing in the related technology, the number of frequency mixers is reduced, so that the size of the frequency spectrum detection device is reduced, and the portability of the frequency spectrum detection device is improved.

Optionally, the controllable frequency mixing unit includes a local oscillator signal generator and a frequency mixer;

the local oscillation signal generator is used for outputting local oscillation signals with different frequencies;

the frequency mixer is respectively connected with the signal receiving end and the local oscillation signal generator and is used for receiving the signal to be detected and the local oscillation signal and mixing the signal to be detected and the local oscillation signal to output a mixing output signal;

and the processing unit is connected with the local oscillator signal generator and is used for adjusting the frequency of the local oscillator signal when the unique frequency value of the signal to be measured cannot be obtained through calculation.

By adopting the technical scheme, the processing unit can control the local oscillation signal generator to output local oscillation signals with different frequencies, so that the frequency of the mixing output signal output by the mixer is within a specified frequency range, and the processing unit can demodulate to obtain the unique frequency value of the signal to be detected.

Optionally, the processing unit is further configured to adjust the preset frequency range.

By adopting the technical scheme, the detection range of the frequency spectrum detection device can be changed by adjusting the preset frequency range, so that the frequency spectrum detection device is convenient for workers to use.

Optionally, the device further comprises a signal processing unit, wherein the signal processing unit is connected to the signal receiving terminal and the frequency mixer, and is used for processing the signal to be detected.

By adopting the technical scheme, the signal processing unit can carry out conventional processing such as filtering, amplitude limiting, adjustable attenuation, amplification and the like on the signal to be detected so as to facilitate frequency mixing.

Optionally, the system further comprises a display unit, wherein the display unit is connected to the processing unit and is used for displaying the frequency spectrum of the signal to be detected in real time according to the frequency value of the signal to be detected.

By adopting the technical scheme, the frequency spectrum of the signal to be detected can be checked by the staff through the display unit, and the staff can use the frequency spectrum conveniently.

Optionally, the processing unit is connected with a power supply unit, an adjusting button and a rotary encoder.

By adopting the technical scheme, the power supply unit can provide a power supply, the adjusting key can adjust the frequency spectrum image in the display unit, and the rotary encoder can adjust the frequency of the local oscillation signal.

Optionally, the system further comprises a communication unit, and the communication unit is connected with the processing unit.

Through adopting above-mentioned technical scheme, communication unit can supply the staff to carry out remote operation, also can transmit data etc. convenient to use then.

In a second aspect, the present application provides a method for detecting a signal frequency, which adopts the following technical solutions:

a signal frequency detection method comprises the steps of obtaining frequency values of partial signals of a mixing output signal in a preset frequency range, wherein the mixing output signal is a signal obtained by mixing a signal to be detected received by a signal receiving end with a local oscillation signal;

and determining the frequency value of the signal to be detected according to the frequency value of the partial signal of the mixing output signal within the preset frequency range and the frequency value of the local oscillation signal.

By adopting the technical scheme, the frequency value of the signal to be detected can be determined by the frequency spectrum detection device by using single-stage mixing, so that the number of mixers is reduced, the size of the frequency spectrum detection device is reduced, and the portability of the frequency spectrum detection device is improved.

Optionally, the method for determining the frequency value of the signal to be measured according to the frequency value of the partial signal of the mixing output signal within the preset frequency range and the frequency value of the local oscillation signal includes:

calculating the frequency value of the signal to be detected according to the frequency value of the partial signal of the mixing output signal within the preset frequency range and the frequency value of the local oscillation signal;

judging whether the frequency value of the signal to be detected is unique;

if not, adjusting the frequency value of the local oscillation signal, and determining the unique frequency value of the signal to be detected according to the change of the calculated frequency value of the signal to be detected.

By adopting the technical scheme, because the frequency of the signal to be measured is unknown, the frequency value of the signal to be measured obtained through calculation may not be unique, and therefore, only one frequency value needs to be determined from the frequency value obtained through calculation. According to the technical scheme, the unique frequency value can be determined by adjusting the frequency value of the local oscillation signal and according to the change of the calculated frequency value, and the frequency value of the signal to be measured can be accurately measured.

Optionally, the frequency of the local oscillation signal is determined according to the frequency range of the signal to be detected and a preset frequency range.

By adopting the technical scheme, the frequency mixing output signal with the frequency within the preset frequency range can be obtained after the signal to be measured and the local oscillation signal are mixed, and the frequency value of the signal to be measured can be conveniently measured.

In summary, the present application includes at least one of the following beneficial technical effects:

the frequency spectrum detection device can carry out single-stage frequency mixing on a signal to be detected, and compared with multi-stage frequency mixing in the related art, the number of frequency mixers is reduced, so that the size of the frequency spectrum detection device is reduced, and the portability of the frequency spectrum detection device is improved.

Drawings

Fig. 1 is a system diagram of a spectrum sensing apparatus according to an embodiment of the present application.

Fig. 2 is a schematic flow chart of a signal frequency detection method according to an embodiment of the present application.

Fig. 3 is a system diagram of an automatic calibration device according to an embodiment of the present application.

Description of reference numerals: 1. a signal receiving end; 2. a signal processing unit; 3. a controllable mixing unit; 31. a local oscillator signal generator; 32. a mixer; 4. a receiving unit; 5. a processing unit; 6. a display unit; 7. a power supply unit; 8. adjusting a key; 9. a rotary encoder; 10. a communication unit; 11. a radio frequency signal source; 12. the control unit is calibrated.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to fig. 1-3 and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The embodiment of the application discloses a frequency spectrum detection device. Referring to fig. 1, the spectrum sensing apparatus includes a signal receiving end 1, a signal processing unit 2, a controllable mixing unit 3, a receiving unit 4, a processing unit 5, and a display unit 6, which are capable of detecting the frequency of a signal and displaying it in the form of a spectrogram. Moreover, the frequency spectrum detection device in the embodiment of the application has a small size and good portability.

The signal receiving terminal 1 is configured to receive a signal to be detected, and may be a receiving antenna, or may directly receive a wireless signal. The frequency value of the signal to be detected is within a specified frequency range, and the specified frequency range is a preset frequency range.

The signal processing unit 2 is connected to the signal receiving terminal 1, receives the signal to be detected, and is configured to process the signal to be detected to output an input signal. Specifically, the signal processing unit 2 includes a filter, an amplitude limiter, an adjustable attenuator, a low noise amplifier, and the like, to perform filtering, amplitude limiting, adjustable attenuation, amplification, and the like on the signal to be detected, so as to increase the dynamic range of the input signal. Of course, the signal processing unit 2 further includes an electrostatic impeder for electrostatic protection.

The controllable mixing unit 3 is connected to the signal processing unit 2, receives the input signal, and performs single-stage mixing on the input signal to output a mixed output signal.

It will be appreciated that the controllable mixing unit 3 comprises a local oscillator signal generator 31 and a mixer 32. The local oscillator signal generator 31 is configured to output local oscillator signals with different frequencies; the mixer 32 is connected to the signal processing unit 2 and the local oscillator signal generator 31, respectively, and receives an input signal, for mixing the input signal with a local oscillator signal to output a mixed output signal. This enables the signals to be measured with frequencies within different specified frequency ranges to be mixed with the local oscillation signals with different frequencies to obtain mixed output signals with frequencies within a preset frequency range, so that the signals can be processed by the receiving unit 4. In the embodiment of the present application, the local oscillator signal generator 31 may be a tunable local oscillator. Of course, the local oscillator signal generator 31 and the mixer 32 may also be integrated.

The receiving unit 4 is connected to the controllable frequency mixing unit 3, and a certain frequency range is preset to receive a portion of the frequency mixing output signal, where the frequency is within the preset frequency range. In particular, since the receiving unit 4 mainly receives digital/analog signals, the receiving unit 4 may employ an I0 receiver.

For ease of understanding, a specific example will now be described: suppose the frequency of the signal to be measured is omega₁The frequency value of the local oscillation signal output by the local oscillation signal generator 31 is ω₂From It can be seen that: the mixed output signal comprises a frequency of omega₁+ω₂And a frequency of | ω₁-ω₂A sub-signal of l. Wherein, ω is₁+ω₂And | ω₁-ω₂There are two relationships for the numerical value of |: one relationship is ω₁+ω₂And | ω₁-ω₂The values of | are close, i.e. all within the preset frequency range, so that the receiving unit 4 can simultaneously receive the signal with the frequency ω₁+ω₂And a frequency of | ω₁-ω₂A sub-signal of l. Another relationship is ω₁+ω₂And | ω₁-ω₂The numerical values of | are greatly different, i.e. one frequency value is in the preset frequency range and the other frequency isThe value is not in the preset frequency range, so that the receiving unit 4 can only receive the frequency of omega₁+ω₂Of sub-signal or frequency | ω₁-ω₂A sub-signal of l.

In the present application, the preset frequency range that the receiving unit 4 can receive is 200MHz to 800 MHz. If omega₁＝4.5GHz，ω₂4GHz, then ω₁+ω₂＝8.5GHz，|ω₁-ω₂500MHz, |; if omega₁＝200.1MHz，ω₂200MHz, then ω₁+ω₂＝400.1MHz，|ω₁-ω₂100 Hz; if omega₁＝500MHz，ω₂150MHz, then ω₁+ω₂＝650MHz，|ω₁-ω₂350 MHz. It is obvious that the receiving unit 4 is capable of receiving a frequency ω₁+ω₂And/or at a frequency of | ω₁-ω₂A sub-signal of l.

The receiving unit 4 is configured to analyze a portion of the mixed output signal with a frequency between 200MHz and 800MHz, so as to output a frequency value of the portion of the mixed output signal with the frequency between 200MHz and 800 MHz.

The processing unit 5 is respectively connected to the signal processing unit 2, the controllable frequency mixing unit 3 and the receiving unit 4, and is configured to obtain a frequency value of a portion of the frequency mixing output signal, where the frequency is 200MHz to 800MHz, and calculate a unique frequency value of the signal to be measured, so as to output a result signal.

It should be noted that when the frequency value ω is received by the processing unit 5₁+ω₂By calculating ω₁＝ω₁+ω₂-ω₂The frequency value omega of the signal to be measured can be obtained₁. It should be noted that the frequency value ω is received by the processing unit 5 at the same time₁+ω₂And a frequency of | ω₁-ω₂I sub-signal, due to ω₁＞0，ω₂> 0, so ω₁+ω₂＞|ω₁-ω₂I, therefore, the higher sub-signal in the frequency value obtained by the processing unit 5 is the frequency ω₁+ω₂Is used to generate the sub-signals of (1).

It can be understood that when the processing unit 5 only receives the frequency value | ω₁-ω₂If the sub-signal is |, the processing unit 5 cannot determine ω₁And ω₂So that the processing unit 5 calculates the frequency value omega of the signal to be measured₁Two, the frequency value omega of the signal to be measured cannot be determined₁Is what. For this reason, when the processing unit 5 receives only the frequency | ω₁-ω₂In case of | sub-signals, the processing unit 5 is further configured to adjust the frequency value of the local oscillation signal output by the local oscillation signal generator 31.

The following is a specific example:

if omega₁＝2.4GHz，ω₂2GHz, then | ω₁-ω₂|＝400MHz；

If omega₁＝1.6GHz，ω₂2GHz, then | ω₁-ω₂|＝400MHz。

The above description shows that when the processing unit 5 receives the sub-signal with the frequency of 400MHz, the processing unit 5 cannot determine the frequency value ω of the signal to be measured₁Whether it is 2.4GHz or 1.6 GHz.

At this time, the processing unit 5 adjusts the frequency of the local oscillation signal to 1.9GHz, and then:

if omega₁＝2.4GHz，ω₂1.9GHz, then | ω₁-ω₂|＝500MHz；

If omega₁＝1.6GHz，ω₂1.9GHz, then | ω₁-ω₂|＝300MHz。

Obviously, if ω₁＞ω₂Then | ω₁-ω₂I becomes larger; if omega₁＜ω₂Then | ω₁-ω₂The | becomes smaller. Therefore, after the frequency of the local oscillation signal is adjusted by the processing unit 5, if the processing unit 5 detects | ω₁-ω₂If | becomes larger, then ω₁If 2.4GHz, | ω is detected₁-ω₂I becomes smaller, then ω₁＝1.6GHz。

Conversely, the processing unit 5 may also increase the frequency of the local oscillation signal. In this case, if the processing unit5 detect | ω₁-ω₂I becomes smaller, then ω₁If 2.4GHz, | ω is detected₁-ω₂If | becomes larger, then ω₁＝1.6GHz。

It is noted that the frequency value ω of the signal to be measured cannot be determined in practice by the processing unit 5 when this frequency value ω is not determined by the processing unit 5₁If so, the processing unit 5 only needs to adjust the frequency of the local oscillation signal with a small amplitude to ensure that the receiving unit 4 can also receive the local oscillation signal with the frequency | ω₁-ω₂A sub-signal of l.

The display unit 6 is connected with the processing unit 5, receives the result signal, and is used for displaying the frequency spectrum of the signal to be measured in real time according to the frequency value of the signal to be measured. Specifically, the display unit 6 is connected to a display driving chip for driving the display unit 6 to operate. In the present embodiment, the display unit 6 is preferably a liquid crystal display screen with a resolution of 800 × 480.

In addition, the processing unit 5 is connected with a power supply unit 7, an adjustment button 8 and a rotary encoder 9. Wherein, the power supply unit 7 is used for supplying power to the processing unit 5; the adjusting key 8 is used for being operated by a worker to adjust the displayed frequency spectrum image; the rotary encoder 9 enables a worker to manually adjust the frequency of the local oscillation signal.

Furthermore, in order to facilitate remote operation by the staff, the processing unit 5 is connected with a communication unit 10.

In the present application, the processing unit 5 is preferably an MCU.

Fig. 2 is a flowchart of a method for detecting a signal frequency according to an embodiment of the present application.

A method for detecting a signal frequency as shown in fig. 2, comprising:

step S101: acquiring frequency values of partial signals of a mixing output signal in a preset frequency range, wherein the mixing output signal is a signal obtained by mixing a signal to be detected received by a signal receiving end with a local oscillation signal;

referring to fig. 1 and 2, it can be understood that the frequency detection device in the present application can detect a wide frequency range, which is inconvenient for the receiving unit 4 to analyze the frequency value ω of the signal to be detected₁. To this endThe frequency range that can be detected by the frequency detection means may be divided into a plurality of frequency bins. Specifically, the frequency range that this application frequency detection device can survey is 30MHz ~ 6GHz, can further divide into the frequency range that frequency detection device can survey: the method of dividing the frequency band is not limited here.

After dividing the frequency bands, the signal receiving terminal 1 analyzes the signal to be detected according to each frequency band when receiving the signal to be detected, so as to determine the frequency value ω of the signal to be detected in each frequency band₁。

It should be noted that, since the receiving unit 4 can only receive the signal with the frequency of 200MHz to 800MHz, the frequency value ω is₁The signal to be measured in any frequency band needs to be mixed with the local oscillation signal with the corresponding frequency. Therefore, the frequency value of the local oscillation signal can be determined according to the frequency range of the signal to be measured and the preset frequency range.

Specifically, a corresponding frequency step is preset for each frequency segment, so that the signal to be measured is mixed with local oscillation signals of different frequencies.

Wherein, although the frequency value ω of the signal to be measured₁Is detected, but the frequency value omega of the signal to be detected₁Are in a known frequency range. Specifically, assume the frequency value ω of the signal to be measured₁Within a specified frequency range of ω_a～ω_bFirst, ω is calculated₁+ω₂And | ω₁-ω₂L, in particular, ω₁+ω₂＝(ω_a+ω₂)～(ω_b+ω₂)，|ω₁-ω₂|＝(ω_a-ω₂)～(ω_b-ω₂) Further, since the receiving unit 4 can receive signals having frequencies of 200MHz to 800MHz, it can be seen that:

first, when the frequency value omega of the signal to be measured₁At a lower time, calculating a frequency value omega of the local oscillation signal₂The method (2) is preferably as follows: omega₂＝ω_a+ω₂-ω_aOr is omega₂＝ω_b+ω₂-ω_b。；

Secondly, when the frequency value omega of the signal to be measured₁At higher time, calculating frequency value omega of local oscillation signal₂The method (2) is preferably as follows: if omega_a＞ω₂Then ω is₂＝ω_a-(ω_a-ω₂) Or ω₂＝ω_b-(ω_b-ω₂). If omega_b＜ω₂Then ω is₂＝ω₂-ω_b+ω_bOr ω₂＝ω₂-ω_a+ω_a。

For ease of understanding, a specific example is illustrated: if omega_a＝2.2GHz，ω_b2.8GHz, then ω₂2 GHz; or may be ω_a＝1.2GHz，ω_b1.SGHz, then ω₂2GHz to make at ω_a～ω_bFrequency value omega of signal to be measured₁In any case, after mixing with the local oscillation signal having a frequency value of 2GHz, the mixing output signal has a portion having a frequency value within 200MHz to 800 MHz.

In summary, the preset frequency steps may be 1GHz, 2GHz, 3GHz, etc., although other preset schemes are possible and will not be described in detail herein.

From the above description, it can be appreciated that the mixed output signal obtained after mixing includes a frequency ω₁+ω₂And a frequency of | ω₁-ω₂A sub-signal of l.

Since the frequency range that can be received is preset in the receiving unit 4, the receiving unit 4 can only receive signals with a frequency of 200MHz to 800 MHz. Wherein, according to the frequency value omega of the signal to be measured₁And the frequency value omega of the local oscillation signal₂The resulting mixed output signal will appear to be only omega₁+ω₂In the range of 200MHz to 800MHz, only omega can appear₁-ω₂Omega can also appear if | is within 200 MHz-800 MHz₁+ω₂And | ω₁-ω₂All in 200 MHz-800 MHzThe case (1). No matter what is received by the receiving unit 4 is ω₁+ω₂、|ω₁-ω₂I or ω₁+ω₂And | ω₁-ω₂The frequency values corresponding thereto are analyzed and output, so that the processing unit 5 calculates the frequency value of the signal to be measured according to the frequency values.

Step S102: and determining the frequency value of the signal to be measured according to the frequency value of the partial signal of the mixing output signal in the preset frequency range and the frequency value of the local oscillation signal.

Optionally, step S102 includes the following steps: (step S1021 to step S1024)

Step S1021: calculating the frequency value of the signal to be measured according to the frequency value of the partial signal of the mixing output signal in the preset frequency range and the frequency value of the local oscillation signal;

step S1022: judging whether the frequency value of the signal to be detected is unique; if yes, go to step S1023, otherwise go to step S1024:

step S1023: and determining the frequency value as the frequency value of the signal to be detected.

Step S1024: and adjusting the frequency value of the local oscillation signal, and determining the unique frequency value of the signal to be detected according to the change of the frequency value of the signal to be detected obtained through calculation.

The processing unit 5 is configured to perform calculations in different ways for the different situations described above.

In particular, when the processing unit 5 receives a frequency ω₁+ω₂By calculating ω₁＝ω₁+ω₂-ω₂The frequency value omega of the signal to be measured can be obtained₁. It should be noted that when the processing unit 5 receives the signals at the same time, the frequency is ω₁+ω₂And a frequency of | ω₁-ω₂I sub-signal, due to ω₁＞0，ω₂> 0, so ω₁+ω₂＞|ω₁-ω₂I, therefore, the higher sub-signal in the frequency value obtained by the processing unit 5 is the frequency ω₁+ω₂Is used to generate the sub-signals of (1).

When the processing unit 5 is connected onlyReceived frequency of | ω₁-ω₂If the sub-signal is |, the processing unit 5 cannot determine ω₁And ω₂So that the processing unit 5 calculates the frequency value omega of the signal to be measured₁Two, the frequency value omega of the signal to be measured cannot be determined₁Is what. For this reason, when the processing unit 5 receives only the frequency | ω₁-ω₂For the sub-signal of | the processing unit 5 adjusts the frequency of the local oscillation signal by a small amplitude. Taking the example of increasing the frequency of the local oscillation signal, if the processing unit 5 detects | ω₁-ω₂If | becomes larger, then ω₁＞ω₂If | ω is detected₁-ω₂I becomes smaller, then ω₁＜ω₂In this way the processing unit 5 is able to determine the frequency value omega of the actual signal to be measured₁。

Conversely, by reducing the frequency of the local oscillation signal, the processing unit 5 can also determine the frequency value ω of the unique signal to be measured₁I.e. if the processing unit 5 detects | ω₁-ω₂I becomes smaller, then ω₁＞ω₂If | ω is detected₁-ω₂If | becomes larger, then ω₁＜ω₂。

It can be understood that the preset frequency range preset by the receiving unit 4 can be adaptively adjusted according to actual detection requirements. Specifically, the preset frequency range can be adjusted by the processing unit 5.

After determining the unique frequency value of the signal to be measured, the display unit 6 can display the frequency value in the form of a spectrogram, where the frequency value can be displayed in the form of a spectrogram in each unit time, that is, all frequency values existing in each unit time in the signal to be measured can be displayed.

It is worth mentioning here that the signal to be measured has a frequency value ω in each frequency bin₁There may be a plurality. The following description is given of a specific detection process per unit time:

first, the signal receiving terminal 1 receives a signal to be measured in a unit time, and scans the signal to be measured in sequence from a low frequency to a high frequency according to divided frequency bands.

Then, when a plurality of frequency values are received in a frequency band, the specific value of each frequency is sequentially detected, and the detection process is to adjust the local oscillator signal generator 31 to a corresponding frequency range, so that the receiving unit 4 receives and analyzes each partial frequency mixing output signal or each complete frequency mixing output signal to obtain a corresponding frequency value, and the processing unit 5 demodulates to obtain the frequency value of the signal to be detected.

Finally, the obtained frequency values are sequentially displayed through the display unit 6.

Of course, the operator may also manually adjust the frequency step of the local oscillator signal generator 31 through the rotary encoder 9.

It can be understood that, in order to make the detection result of the spectrum detecting apparatus more accurate, the spectrum detecting apparatus is also correspondingly provided with an automatic calibration apparatus for calibration.

Referring to fig. 3, the automatic calibration apparatus includes a radio frequency signal source 11 and a calibration control unit 12.

Specifically, the radio frequency signal source 11 is connected to the calibration control unit 12, and is configured to output an original signal with a specified frequency under the control of the calibration control unit 12. It can be understood that, before the rf signal source 11 is connected to the calibration control unit 12, an accurate power meter needs to be connected to calibrate the rf signal source 11.

The spectrum detecting device is connected with the radio frequency signal source 11, receives the original signal and outputs a result signal. Wherein the frequency of the original signal is ω_AThe frequency detection value of the original signal contained in the output resultant signal is ω_B。

The calibration control unit 12 is connected to the spectrum sensing device via the communication unit 10 connected to the spectrum sensing device, and receives the result signal for calibrating the spectrum sensing device when the frequency value reflected by the result signal is not equal to the specified frequency of the original signal. I.e. the frequency detection value omega of the original signal detected by the spectrum detection means_BFrequency value omega of original signal_AAnd when errors exist, calibrating the frequency spectrum detection device. The calibration control unit 12 and the spectrum sensing device may be connected by wire and/or wirelessly.

The implementation principle of the spectrum detection device, the automatic calibration device and the detection method in the embodiment of the application is as follows: by setting the controllable frequency mixing unit 3 in the spectrum detecting device to be a single-stage frequency mixing, the number of the frequency mixers 32 is reduced, and the size of the spectrum detecting device is reduced. In some special cases, the mixing output signal output by the controllable mixing unit 3 during single-stage mixing may cause the processing unit 5 to be unable to determine the unique frequency value of the signal to be measured. Therefore, the processing unit 5 fine-tunes the frequency value of the local oscillation signal, so that the processing unit 5 can determine a unique frequency value, and further, the frequency detection function of the frequency spectrum detection device in the application is realized.

The foregoing is a preferred embodiment of the present application and is not intended to limit the scope of the application in any way, and any features disclosed in this specification (including the abstract and drawings) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.