Wireless signal acquisition circuit and equipment

Abstract

The invention relates to a wireless signal acquisition circuit and equipment. The wireless signal acquisition circuit comprises a signal receiving unit used for receiving a radio signal and outputting a radio frequency signal. And the multi-stage power division network is connected with the signal receiving unit, the multi-stage power division network is used for carrying out multi-stage power division processing on the radio frequency signal so as to at least obtain a first initial signal and a second initial signal, and the first initial signal and the second initial signal are located at two different frequency bands of wireless communication respectively. And the signal processing unit is connected with the multi-stage power division network, and the signal processing unit is used for respectively processing the first initial signal and the second initial signal so as to respectively obtain a first target signal and a second target signal. According to the invention, the number of components can be reduced, the layout of each frequency band signal link on the PCB can be better planned, the distance between the signal lines is increased, and the crosstalk between the lines is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless signals, and in particular, to a wireless signal acquisition circuit and device. Background Art

[0002] In the radio signal detection scenario, it is usually necessary to detect the cellular communication frequency band of the radio signals emitted by the terminal device to determine whether there are terminal devices relying on cellular communication in the scenario. In order to comprehensively detect radio signals, it is necessary to sample radio signals in the commonly used cellular communication frequency bands (including communication frequency bands such as 2G, 3G, 4G, 5G, etc.) to achieve signal full-frequency band coverage detection. However, due to the relatively wide overall frequency band of cellular communication (703 MHz - 5000 MHz), the current wireless signal acquisition circuit is prone to serious signal crosstalk problems during signal sampling. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a wireless signal acquisition circuit and device in view of the above-mentioned serious signal crosstalk defects existing in the traditional technology.

[0004] The embodiments of the present invention construct a wireless signal acquisition circuit, and the wireless signal acquisition circuit includes:

[0005] A signal receiving unit, configured to receive radio signals and output radio frequency signals;

[0006] A multi-stage power distribution network, connected to the signal receiving unit, where the multi-stage power distribution network is configured to perform multi-stage power distribution processing on the radio frequency signals to obtain at least a first initial signal and a second initial signal, and the first initial signal and the second initial signal are respectively located in two different frequency bands of wireless communication;

[0007] A signal processing unit, connected to the multi-stage power distribution network, where the signal processing unit is configured to perform signal processing on the first initial signal and the second initial signal respectively to obtain a first target signal and a second target signal.

[0008] Preferably, the multi-stage power distribution network includes a first power distribution circuit and a second power distribution circuit:

[0009] The first power distribution circuit, connected to the signal receiving unit, is configured to perform first-stage power distribution processing on the radio frequency signals to obtain at least a first first-stage power distribution signal and a second first-stage power distribution signal;

[0010] The second power distribution circuit, connected to the first power distribution circuit, is configured to perform second-stage power distribution processing on the first first-stage power distribution signal and the second first-stage power distribution signal respectively to obtain the first initial signal and the second initial signal.

[0011] Preferably, the first power splitting circuit is further configured to perform a first - stage power splitting process on the radio frequency signal to obtain a third first - stage power splitting signal;

[0012] The second power splitting circuit is further configured to perform a second - stage power splitting process on the third first - stage power splitting signal to obtain a third initial signal;

[0013] The signal processing unit is further configured to perform signal processing on the third initial signal to obtain a third target signal;

[0014] The frequency band of the first initial signal is lower than that of the third initial signal, and the frequency band of the third initial signal is lower than that of the second initial signal.

[0015] Preferably, the number of the first initial signal, the second initial signal, and the third initial signal is multiple;

[0016] The second power splitting circuit includes:

[0017] A first second - stage power splitting circuit, connected to the first power splitting circuit, the first second - stage power splitting circuit is configured to perform a second - stage power splitting process on the first first - stage power splitting signal to obtain multiple first initial signals;

[0018] A second second - stage power splitting circuit, connected to the first power splitting circuit, the second second - stage power splitting circuit is configured to perform a second - stage power splitting process on the second first - stage power splitting signal to obtain multiple second initial signals;

[0019] A power splitting unit, connected to the first power splitting circuit, the power splitting unit is configured to perform a power splitting process on the third first - stage power splitting signal to obtain multiple third initial signals.

[0020] Preferably, the power splitting unit includes:

[0021] A third second - stage power splitting circuit, connected to the first power splitting circuit, the third second - stage power splitting circuit is configured to perform a second - stage power splitting process on the third first - stage power splitting signal to obtain a second - stage power splitting signal;

[0022] A third - stage power splitting circuit, connected to the third second - stage power splitting circuit, the third - stage power splitting circuit is configured to perform a third - stage power splitting process on the second - stage power splitting signal to obtain multiple third initial signals.

[0023] Preferably, the signal processing unit includes:

[0024] A plurality of first signal processing units, each of the first signal processing units is respectively connected to one of the signal output terminals of the first two-stage power splitter circuit to access one path of the first initial signal; each of the first signal processing units is configured to perform signal processing on the accessed first initial signal to obtain one path of the first target signal;

[0025] A plurality of second signal processing units, each of the second signal processing units is respectively connected to one of the signal output terminals of the second two-stage power splitter circuit to access one path of the second initial signal; each of the second signal processing units is configured to perform signal processing on the accessed second initial signal to obtain one path of the second target signal;

[0026] A plurality of third signal processing units, each of the third signal processing units is respectively connected to one of the signal output terminals of the power splitter unit to access one path of the third initial signal; each of the third signal processing units is configured to perform signal processing on the accessed third initial signal to obtain one path of the third target signal.

[0027] Preferably, at least two of the first signal processing unit, the second signal processing unit, and the third signal processing unit have the same circuit structure.

[0028] Preferably, at least one of each of the first signal processing unit, each of the second signal processing unit, and each of the third signal processing unit includes a first filter, an attenuator, and a detector, and the first filter and the attenuator are connected between the second power splitter circuit and the detector.

[0029] Preferably, at least one of each of the first signal processing unit, each of the second signal processing unit, and each of the third signal processing unit further includes a test port, and the test port is disposed on the path between the multi-stage power splitter network and the detector;

[0030] When a test cable is connected to the test port, the test port disconnects the path between the output terminal of the multi-stage power splitter network and the detector, and is configured to output the signal output by the multi-stage power splitter network to the test cable;

[0031] When the test cable is not connected to the test port, the test port conducts the path between the output terminal of the multi-stage power splitter network and the detector, and is configured to output the signal output by the multi-stage power splitter network to the detector.

[0032] Preferably, the first and second power distribution circuits include a first resistor and a plurality of second resistors. The first end of the first resistor is connected to the first power distribution circuit, the second end of the first resistor is respectively connected to the first ends of the plurality of second resistors, and the second ends of the plurality of second resistors are connected to the plurality of first signal processing units one by one.

[0033] Preferably, the signal receiving unit includes an antenna and a first radio frequency amplification circuit; the antenna is used to receive radio signals; the first radio frequency amplification circuit is connected to the antenna and the first power distribution circuit, and is used to amplify the radio signals to obtain radio frequency signals;

[0034] The multi-stage power distribution network further includes:

[0035] A second radio frequency amplification circuit, which is arranged between the first power distribution circuit and the second power distribution circuit.

[0036] An embodiment of the present invention also constructs a signal detection device, including the above-mentioned wireless signal acquisition circuit.

[0037] An embodiment of the present invention also constructs a wiretapping and spying device detection device, including the above-mentioned wireless signal acquisition circuit.

[0038] In the technical solution provided by the embodiment of the present invention, by arranging a multi-stage power distribution network in the wireless signal acquisition circuit, the radio frequency signals output by the signal receiving unit can be subjected to multi-stage power distribution processing. First, signals of different frequency bands are separated, and then the signals of each frequency band are further subdivided. Through the characteristics of multiple output terminal branches separated after each stage of power distribution processing and the cascading between multiple stages, a multi-path signal line is formed to transmit the signals of the corresponding frequency band. Compared with the solution in which too many signal links are directly separated by one-stage power distribution, resulting in a small distance between each signal link and crosstalk between adjacent lines, the embodiment of the present invention can effectively reduce the number of components by means of gradual power distribution, so as to better plan the layout of signal links of each frequency band on the PCB, increase the distance between signal lines, and reduce the crosstalk between lines. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. In the drawings:

[0040] Figure 1 is a schematic diagram of the circuit module of the wireless signal acquisition circuit according to the first embodiment of the present invention;

[0041] Figure 2 It is a schematic diagram of the circuit modules of the wireless signal acquisition circuit according to the second embodiment of the present invention;

[0042] Figure 3 It is a partial schematic diagram of the circuit modules related to the first initial signal of the wireless signal acquisition circuit according to the second embodiment of the present invention;

[0043] Figure 4 It is a partial schematic diagram of the circuit modules related to the second initial signal of the wireless signal acquisition circuit according to the second embodiment of the present invention;

[0044] Figure 5 It is a partial schematic diagram of the circuit modules related to the third initial signal of the wireless signal acquisition circuit according to the second embodiment of the present invention;

[0045] Figure 6 It is a partial schematic diagram of the circuit modules related to the third target signal of the wireless signal acquisition circuit according to the second embodiment of the present invention;

[0046] Figure 7 It is a partial schematic diagram of the circuit modules related to the test of the wireless signal acquisition circuit according to the third embodiment of the present invention;

[0047] Figure 8 It is a schematic diagram of the internal principle of the test port of the wireless signal acquisition circuit according to the third embodiment of the present invention.

[0048] Label description:

[0049] 10: Wireless signal acquisition circuit; 101: Signal receiving unit; 102: Multistage power division network; 103: Signal processing unit;

[0050] 1011: First radio frequency amplification circuit; 1021: First power division circuit; 1022: Second power division circuit; 1023: Second radio frequency amplification circuit; 1031: First signal processing unit; 1032: Second signal processing unit; 1033: Third signal processing unit;

[0051] 10111: First-stage radio frequency amplification circuit; 10112: Second-stage radio frequency amplification circuit; 10221: First second-stage power division circuit; 10222: Second second-stage power division circuit; 10223: Power division unit;

[0052] 102231: Third second-stage power division circuit; 102232: Third-stage power division circuit;

[0053] Z1: First filter; Z3: Third filter; R1: First resistor; R2: Second resistor; AT: Attenuator; PD: Detector; ANT: Antenna; A1: First radio frequency amplifier; A2: Second radio frequency amplifier; A3: Third radio frequency amplifier; S1: Test port. Detailed implementation manners

[0054] For a clearer understanding of the technical features, objectives, and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0055] In the following description, specific details such as specific system architectures and technologies are presented for the purpose of illustration rather than limitation, in order to thoroughly understand the embodiments of the present invention. However, those skilled in the art should clearly understand that the present invention can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from hindering the description of the present invention.

[0056] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0057] In the embodiments of the present invention, unless otherwise clearly defined and limited, terms such as "installation", "connection", "attachment", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one. "Connection" can be a direct connection or an indirect connection through an intermediate medium. It can be the internal communication of two components or the interaction relationship between two components. It can also be the direct communication of two circuit modules or the communication through other modules. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] It should be understood that although terms such as "first", "second", "third", etc. may be used to limit components in the embodiments of the present invention, they are only used to facilitate the distinction of the corresponding components. Without further declaration, the above terms have no special meanings and therefore should not be construed as limiting the protection scope of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the technical field to which the present invention pertains. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0059] Different cellular communication technology standards will have their own frequency band configurations and quantity requirements, and different telecom operators will also adopt different frequency bands. Therefore, when collecting signals in cellular communication frequency bands, it is necessary to collect signals for each frequency band. The inventor found that all signals in the current 2G-5G cellular communication frequency bands can be received using 11 channels. In order to extract the signals of 11 frequency bands, the full-band signals of cellular communication can be subdivided in a direct 1-to-11 manner to output 11 corresponding frequency band signals. However, the direct 1-to-11 method directly divides too many signal links. On the one hand, due to the small frequency band distance between signal links, signal crosstalk is likely to occur between links with a small frequency band distance. On the other hand, in the PCB layout, it is easy to make the signal lines too close to each other, thus increasing the crosstalk risk between adjacent lines. Therefore, an embodiment of the present invention proposes a wireless signal acquisition circuit based on multi-stage power division.

[0060] Figure 1 FIG. 4 is a schematic diagram of the circuit modules of the wireless signal acquisition circuit 10 according to Embodiment 1 of the present invention. The wireless signal acquisition circuit 10 of this embodiment includes a signal receiving unit 101, a multi-stage power division network 102, and a signal processing unit 103. The signal receiving unit 101 is used to receive radio signals and output radio frequency signals. The multi-stage power division network 102 is connected to the signal receiving unit 101. The multi-stage power division network 102 is used to perform multi-stage power division processing on the radio frequency signals to obtain at least a first initial signal and a second initial signal, and the first initial signal and the second initial signal are respectively located in two different frequency bands of wireless communication. The signal processing unit 103 is connected to the multi-stage power division network 102. The signal processing unit 103 is used to perform signal processing on the first initial signal and the second initial signal respectively, including but not limited to filtering processing, to obtain a first target signal and a second target signal respectively.

[0061] Specifically, in the wireless signal acquisition circuit 10, radio signals based on cellular communication frequency bands within the detection area can be received through the signal receiving unit 101, and radio frequency signals can be output through processing such as signal amplification. It can be understood that the radio signals mentioned in the embodiments of the present invention are, for example, radio signals emitted by terminal devices such as mobile phones, eavesdropping devices, tablet computers, laptop computers, vehicle-mounted systems, Internet of Things devices, wearable devices, etc. when communicating using cellular communication frequency bands. The radio frequency signal is the radio frequency signal corresponding to the radio signal.

[0062] The multi-stage power splitting network 102 performs multi-stage power splitting processing on the radio frequency signal to obtain at least a first initial signal and a second initial signal. It can be understood that through the multi-stage power splitting network 102 in the embodiments of the present invention, multi-stage power distribution can be performed, and finally multiple signals corresponding to different frequency bands can be split out, covering radio signals of multiple frequency bands, such as signals in communication frequency bands such as 2G, 3G, 4G, and 5G. Each stage of power splitting in the multi-stage power splitting network 102 can split out multiple branches. The link where each branch of the previous stage is located is further split into multiple branches after the power splitting processing of the next stage. For example, according to requirements, signals of different frequency bands are first split out through the first-stage power splitting, and then the signals of each frequency band are further power split to subdivide into multiple signals. In this way, multiple branches are split out through each stage of power splitting processing and the cascading characteristics between multiple stages, and finally a multi-path signal link is formed, and each path of the signal link outputs a signal corresponding to a frequency band.

[0063] It should be noted that the power splitting processing mentioned in this embodiment only represents power distribution. Whether the power distribution is an even distribution or an uneven distribution, and whether the frequency bands of the branches are the same after each stage of power distribution are not limited in this embodiment. As long as the first initial signal and the second initial signal are finally output after multi-stage power splitting.

[0064] Exemplarily, the first initial signal may be a low-frequency band signal (such as a 2G band signal, or a custom low-frequency band range, such as a signal in the range of 617 MHz - 960 MHz is a low-frequency band signal). The second initial signal may be a high-frequency band signal with a higher frequency band than the first initial signal (such as a 5G band signal, or a custom high-frequency band range, such as a signal in the range of 3300 MHz - 5950 MHz is a high-frequency band signal). Of course, it is also possible that the second initial signal is a low-frequency band signal and the first initial signal is a high-frequency band signal with a higher frequency band than the second initial signal. In the following other embodiments, the wireless signal acquisition circuit 10 of the embodiments of the present invention is mainly explained by taking the first initial signal as a low-frequency band signal and the second initial signal as a high-frequency band signal as an example.

[0065] In the wireless signal acquisition circuit 10, each initial signal output by the multi-stage power division network 102 can be subjected to signal processing such as filtering through the signal processing unit 103 to obtain the corresponding target signal. Each target signal can be provided to the host computer, the processor, or other control terminals for calculation to determine whether there is a communication signal in the corresponding cellular communication frequency band. It can be understood that the target signals mentioned in the embodiments of the present invention are all the target signals corresponding to each initial signal. For example, the first target signal is the signal within the communication frequency band of the first initial signal obtained after signal processing of the first initial signal. Similarly, the second target signal is the signal within the communication frequency band of the second initial signal obtained after signal processing of the second initial signal. Exemplarily, if the first initial signal is a low-frequency band signal, the control terminal receives the first target signal and through calculation, it can determine that the low-frequency band signal in the cellular communication frequency band is received. Specifically, the number of branches of the last stage power division output of the multi-stage power division network 102 can correspond one-to-one to the number of target signals output by the signal processing unit 103.

[0066] The beneficial effect of the embodiment of the present invention by performing step-by-step power division processing on the received radio signals through the multi-stage power division network 102 is as follows: Taking the example that 11 frequency band signals are finally required, regardless of the signals of which frequency bands, after being output from the signal receiving unit 101, a series of signal processing operations such as amplification and filtering need to be performed on the signals. If the signals output by the signal receiving unit 101 are directly divided into 11 paths, then a series of devices are required for each of these 11 receiving links to process the received signals respectively. In this embodiment, however, the multi-stage power division network 102 does not divide into 11 paths at once, but performs power division step by step. In this way, for the front-end amplification and other processing operations, only a smaller number of devices need to be designed to complete (because the number of branches in the previous stages is less than 11 paths). In this way, the devices required for the entire wireless signal acquisition circuit 10 can be reduced.

[0067] Therefore, through the step-by-step power division processing method, this embodiment can not only effectively sample all frequency band signals, but also, compared with the solution where too many signal links are directly divided by one-stage power division, resulting in a small distance between each signal link and crosstalk between adjacent lines, the multi-stage power division solution of this embodiment can reduce the number of components, thereby effectively increasing the distance between signal lines, facilitating the PCB layout, conveniently and flexibly arranging the positions of each signal line on the PCB board, increasing the spacing between signal lines, and thus effectively reducing the signal crosstalk between different frequency band signals and adjacent signal lines.

[0068] Figures 2 to 6It is a schematic diagram of the overall and partial specific circuits of the wireless signal acquisition circuit 10 according to the second embodiment of the present invention. The wireless signal acquisition circuit 10 of this embodiment includes a signal receiving unit 101, a multi-stage power splitting network 102, and a signal processing unit 103. As an embodiment, the signal receiving unit 101 includes an antenna for receiving radio signals.

[0069] Further, as Figures 2 to 4 shown, the multi-stage power splitting network 102 includes a first power splitting circuit 1021 and a second power splitting circuit 1022. The first power splitting circuit 1021 is connected to the signal receiving unit 101 and is used to perform the first-stage power splitting process on the radio frequency signal to obtain at least a first first-stage power splitting signal and a second first-stage power splitting signal (as Figures 3 to 4 shown). It can be understood that the first first-stage power splitting signal and the second first-stage power splitting signal belong to signals of different frequency bands. The second power splitting circuit 1022 is connected to the first power splitting circuit 1021 and is used to perform the second-stage power splitting process on the first first-stage power splitting signal and the second first-stage power splitting signal respectively to obtain a first initial signal and a second initial signal. Specifically, in the embodiment of the present invention, the first power splitting circuit 1021 and the second power splitting circuit 1022 can achieve uniform power distribution within the corresponding frequency band ranges of signals of different frequency bands, and can cover at least signals in communication frequency bands such as 2G and 3G.

[0070] The first power splitting circuit 1021 first splits signals of different frequency bands from the radio frequency signal. In this embodiment, the signals split by the first power splitting circuit 1021 at least include a first first-stage power splitting signal (corresponding to a low-frequency band signal) and a second first-stage power splitting signal (corresponding to a high-frequency band signal) of different frequency bands, and can also split low, medium, and high-frequency band signals according to requirements. The second power splitting circuit 1022 respectively performs power distribution on the signals output from each branch of the first power splitting circuit 1021, so that signals having the same frequency band as the signals output from each branch of the first power splitting circuit 1021 can be obtained, that is, the second-stage power splitting process is performed on the first first-stage power splitting signal and the second first-stage power splitting signal to obtain a first initial signal and a second initial signal. For example, the first power splitting circuit 1021 outputs a low-frequency band signal and a high-frequency band signal through two branches respectively, and these signals are respectively subjected to the second-stage power splitting process by the second power splitting circuit 1022, and signals having the same frequency band as the low-frequency band signal output by the first power splitting circuit 1021 and signals having the same frequency band as the high-frequency band signal output by the first power splitting circuit 1021 can be obtained.

[0071] In this embodiment, the signal receiving unit 101 may further include a first radio frequency amplification circuit 1011. Both ends of the first radio frequency amplification circuit 1011 are respectively connected to the antenna ANT and the first power distribution circuit 1021, and are configured to amplify the radio signal output by the antenna ANT to obtain a radio frequency signal. In this embodiment, by first amplifying the received radio signal to a preset multiple by the first radio frequency amplification circuit 1011, the attenuation of the signal that may be caused by the multi-stage power distribution network 102 and the signal processing unit 103 can be effectively offset. Optionally, the first radio frequency amplification circuit 1011 can amplify the radio signal by about 30 dB.

[0072] As an option, as Figures 5 to 6 shown, the first power distribution circuit 1021 is further configured to perform a first-stage power distribution process on the radio frequency signal to obtain a third first-stage power distribution signal. The second power distribution circuit 1022 is further configured to perform a second-stage power distribution process on the third first-stage power distribution signal to obtain a third initial signal. The signal processing unit 103 is further configured to perform signal processing on the third initial signal to obtain a third target signal. It should be noted that the frequency band of the first initial signal is lower than that of the third initial signal, and the frequency band of the third initial signal is lower than that of the second initial signal. It can be understood that through the first power distribution circuit 1021 and the second power distribution circuit 1022 in the embodiments of the present invention, signals in more frequency bands can ultimately be output, and signals in communication frequency bands such as 2G, 3G, and 5G can be at least covered.

[0073] As an embodiment, the first power divider circuit 1021 first divides a radio frequency signal into three signals of different frequency bands, that is, it may include a first primary power-divided signal (corresponding to a low-frequency band signal), a second primary power-divided signal (corresponding to a high-frequency band signal), and a third primary power-divided signal (corresponding to a medium-frequency band signal), and the frequency band ranges of these three signals are relatively wide. Due to the relatively wide frequency band range, there is a greater degree of freedom in the selection of the first power divider circuit 1021, and the function of the first power divider circuit 1021 is to both perform power distribution and make the frequency band ranges of the different paths of the distributed signals different. For example, the first power divider circuit 1021 can select a common duplexer. The second power divider circuit 1022 further performs power distribution within the corresponding frequency band range of the signal output from each branch of the first power divider circuit 1021, so as to obtain signals having the same frequency band as the signals output from each branch of the first power divider circuit 1021, that is, the first initial signal, the second initial signal, and the third initial signal. For example, the first power divider circuit 1021 outputs a low-frequency band signal, a medium-frequency band signal, and a high-frequency band signal through three branches respectively, and these signals are respectively subjected to a second-stage power division process by the second power divider circuit 1022, and signals having the same frequency band as the low-frequency band signal, signals having the same frequency band as the medium-frequency band signal, and signals having the same frequency band as the high-frequency band signal can be obtained. The first power divider circuit 1021 can select a duplexer. In this embodiment, the second power divider circuit 1022 can only perform power distribution, and its main function is to finally output the required number of signals, such as outputting 11 signals. Since the second power divider circuit 1022 only needs to perform power distribution to divide the required number of signals and does not need to subdivide the frequency band, there are not many limiting factors in the design of the second power divider circuit 1022, and it is easier to implement. For example, several resistors can be directly used for power division. In addition, precisely because the second power divider circuit 1022 is relatively easy to implement, by reasonably designing the second power divider circuit 1022, different numbers of signals can be output in different application scenarios, such as 11 signals, 10 signals, 8 signals, etc., thereby improving the application range of the circuit.

[0074] Further, as Figures 2 to 6As shown, the number of the first initial signal, the second initial signal, and the third initial signal is multiple. The second power splitting circuit 1022 includes a first two-stage power splitting circuit 10221, a second two-stage power splitting circuit 10222, and a power splitting unit 10223. The first two-stage power splitting circuit 10221 is connected to the first power splitting circuit 1021. The first two-stage power splitting circuit 10221 is configured to perform a second-stage power splitting process on the first one-stage power splitting signal to obtain multiple first initial signals. The second two-stage power splitting circuit 10222 is connected to the first power splitting circuit 1021. The second two-stage power splitting circuit 10222 is configured to perform a second-stage power splitting process on the second one-stage power splitting signal to obtain multiple second initial signals. The power splitting unit 10223 is connected to the first power splitting circuit 1021. The power splitting unit 10223 is configured to perform a power splitting process on the third one-stage power splitting signal to obtain multiple third initial signals.

[0075] Among them, the first power splitting circuit 1021 first splits three signals with different frequency bands from the radio frequency signal, that is, it may include a first one-stage power splitting signal (corresponding to the low-frequency band signal), a second one-stage power splitting signal (corresponding to the high-frequency band signal), and a third one-stage power splitting signal (corresponding to the middle-frequency band signal). The first two-stage power splitting circuit 10221 can specifically perform uniform power distribution on the low-frequency band signal, so as to obtain multiple signals with the same frequency band as the low-frequency band signal, that is, multiple first initial signals, and the power of each first initial signal is the same. The second two-stage power splitting circuit 10222 can specifically perform uniform power distribution on the high-frequency band signal, so as to obtain multiple signals with the same frequency band as the high-frequency band signal output by this branch of the first power splitting circuit 1021, that is, multiple second initial signals, and the power of each second initial signal is the same. The power splitting unit 10223 can specifically perform uniform power distribution on the middle-frequency band signal, so as to obtain multiple signals with the same frequency band as the middle-frequency band signal, that is, multiple third initial signals, and the power of each third initial signal is the same.

[0076] It can be understood that the wireless signal acquisition circuit 10 in the embodiment of the present invention can detect more cellular communication frequency bands, such as the cellular communication frequency bands of 2G\3G\4G\5G signals of domestic telecommunications operators.

[0077] Next, take Figures 2 - 6The working principle of the wireless signal acquisition circuit 10 in the illustrated embodiment is described as follows: The signal receiving unit 101 receives radio signals. The first radio frequency amplification circuit 1011 amplifies the radio signals to obtain amplified radio frequency signals and outputs them to the first power distribution circuit 1021. The first power distribution circuit 1021 performs a first-stage power distribution process on the amplified radio frequency signals to obtain three first-stage power distribution signals in different frequency bands, such as the first-stage power distribution signal in the low frequency band (the first first-stage power distribution signal), the first-stage power distribution signal in the middle frequency band (the third first-stage power distribution signal), and the first-stage power distribution signal in the high frequency band (the second first-stage power distribution signal). Exemplarily, the low frequency band is 617 MHz - 960 MHz. The middle frequency band is 1452 MHz - 2690 MHz. The high frequency band is 3300 MHz - 5950 MHz. Then, the second power distribution circuit 1022 performs a second-stage power distribution process on the first-stage power distribution signals that have undergone the first-stage power distribution process, so as to obtain multiple initial signals (such as the first initial signal, the second initial signal, and the third initial signal). Then, the signal processing unit 103 processes each initial signal respectively to obtain multiple target signals, thereby completing the acquisition of 11 target signals.

[0078] In one embodiment, the signal processing unit 103 can further perform frequency band subdivision on the input signals. For example, different first target signals in different frequency bands are output by filtering the first initial signals of different paths. As Figures 2 - 6 shown, the signal processing unit 103 includes multiple first signal processing units 1031, multiple second signal processing units 1032, and multiple third signal processing units 1033. Each first signal processing unit 1031 is respectively connected to one of the signal output terminals of the first second-stage power distribution circuit 10221. Each first signal processing unit 1031 is used to process the first initial signal to obtain a first target signal of one path. Each second signal processing unit 1032 is respectively connected to one of the signal output terminals of the second second-stage power distribution circuit 10222. Each second signal processing unit 1032 is used to process the second initial signal to obtain a second target signal of one path. Each third signal processing unit 1033 is respectively connected to one of the signal output terminals of the power distribution unit 10223. Each third signal processing unit 1033 is used to process the third initial signal to obtain a third target signal of one path.

[0079] Among them, the frequency band of the first target signal can be within the frequency band range of the first initial signal, and the frequency bands of different first target signals are different. The first second-stage power distribution circuit 10221 can include multiple signal output terminals, and each signal output terminal outputs a signal obtained by power distribution of the first first-stage power distribution signal. Different signal output terminals can be connected to different first signal processing units 1031. Taking the first first-stage power distribution signal as a low frequency band signal as an example, Figure 3shows a specific circuit connection scheme between one signal output terminal of the first two-stage power splitting circuit 10221 and the first signal processing unit 1031 in the low-frequency signal link. The connection manners of other signal output terminals of the first two-stage power splitting circuit 10221 with other first signal processing units 1031 are the same as Figure 3 the same. The frequency band of the second target signal can be within the frequency band range of the second initial signal, and the frequency bands of different second target signals are different. The second two-stage power splitting circuit 10222 can include multiple signal output terminals, and each signal output terminal outputs a signal obtained by splitting the second first-stage power split signal. Different signal output terminals can be connected to different second signal processing units 1032. Taking the second first-stage power split signal as a high-frequency band signal as an example, Figure 4 shows a specific circuit connection between one signal output terminal of the second two-stage power splitting circuit 10222 and the second signal processing unit 1032 in the high-frequency signal link. The connections of other signal output terminals with other second signal processing units 1032 are the same as Figure 4 the same. The frequency band of the third target signal can be within the frequency band range of the third initial signal, and the frequency bands of different third target signals are different. The power splitting unit 10223 can include multiple signal output terminals, and each signal output terminal outputs a signal obtained by splitting the third first-stage power split signal. Different signal output terminals can be connected to different third signal processing units 1033. Taking the third first-stage power split signal as an intermediate-frequency signal as an example, Figure 5 shows a specific circuit connection between one signal output terminal of the power splitting unit 10223 and the third signal processing unit 1033 in the intermediate-frequency signal link. The connections of other signal output terminals with other third signal processing units 1033 are the same as Figure 5 the same. Specifically, each first target signal, each second target signal, and each third target signal can be the same as the currently common cellular communication frequency bands respectively. For example, the frequency band of one first target signal is 703 MHz - 748 MHz, the frequency band of another first target signal is 824 MHz - 835 MHz, and the frequency band of one third target signal is 1710 MHz - 1785 MHz.

[0080] Further, as Figure 5 and Figure 6As shown in the figure, the power splitter unit 10223 includes a third two-stage power splitter circuit 102231 and a three-stage power splitter circuit 102232. The third two-stage power splitter circuit 102231 is connected to the first power splitter circuit 1021. The third two-stage power splitter circuit 102231 is configured to perform a second-stage power splitting process on the third first-stage power split signal to obtain a two-stage power split signal. The three-stage power splitter circuit 102232 is connected to the third two-stage power splitter circuit 102231. The three-stage power splitter circuit 102232 is configured to perform a third-stage power splitting process on the two-stage power split signal to obtain multiple third initial signals. In this embodiment, each third signal processing unit 1033 can be specifically connected to one of the signal output terminals of the three-stage power splitter circuit 102232. Each third signal processing unit 1033 is configured to perform signal processing on the corresponding two-stage power split signal to obtain one third target signal.

[0081] It can be understood that in the embodiment of the present invention, the third two-stage power splitter circuit 102231 and the three-stage power splitter circuit 102232 are used to achieve further two-stage power distribution of the intermediate frequency band signals. For example, the third two-stage power splitter circuit 102231 performs a two-stage uniform power distribution on the third first-stage power split signal (such as an intermediate frequency band signal) output from one of the branches of the first power splitter circuit 1021 to obtain multiple two-stage power split signals with the same frequency band. The three-stage power splitter circuit 102232 performs a uniform power distribution on the two-stage power split signals output from each branch of the third two-stage power splitter circuit 102231, so that multiple signals with the same frequency band as the frequency band signal output by the first power splitter circuit 1021 can be obtained, that is, multiple third initial signals. The number of links of the third initial signals corresponds one-to-one to the number of the third signal processing units 1033.

[0082] It should be noted that the difference between the intermediate frequency signal link and the low frequency signal link and the high frequency signal link is that: instead of directly performing a one-time power splitting process to obtain each intermediate frequency band signal, a two-stage power splitting process is further adopted. Taking the need for 6 intermediate frequency band signals as an example, first, a one-to-three power splitter (corresponding to the third two-stage power splitter circuit 102231) is used to split out three intermediate frequency band signals, and then each intermediate frequency band signal passes through a one-to-two power splitter (the three-stage power splitter circuit 102232 can include 3 one-to-two power splitters) to split out 2 intermediate frequency band signals again, and a total of 6 intermediate frequency band signals are obtained. Since the number of specific communication frequency bands corresponding to the intermediate frequency band signals is more than that of the low frequency band and the high frequency band, in this embodiment, a two-stage power splitting process is further adopted for the intermediate frequency band. That is, the reason for not directly using a one-to-six power splitter is also to avoid that directly splitting out 6 paths will result in a small distance between the signal links of each path, which is not convenient for PCB layout.

[0083] Further, as an embodiment, at least two of the first signal processing unit 1031, the second signal processing unit 1032, and the third signal processing unit 1033 may have the same circuit structure, or all three may have the same circuit structure, so that the circuit structure has a high degree of reusability, thereby reducing the circuit design difficulty of the wireless signal acquisition circuit 10. As Figures 3 to 6 shown, at least one of the first signal processing unit 1031, the second signal processing unit 1032, and the third signal processing unit 1033 may further include a first filter Z1, an attenuator AT, and a detector PD. The first filter Z1 and the attenuator AT are disposed between the second power distribution circuit 1022 and the detector PD.

[0084] Further, as Figure 3 shown, the first two-stage power distribution circuit 10221 includes a first resistor R1 and a plurality of second resistors R2. The first end of the first resistor R1 is connected to the first power distribution circuit 1021, the second end of the first resistor R1 is respectively connected to the first ends of the plurality of second resistors R2, and the second ends of the plurality of second resistors R2 are connected to the plurality of first signal processing units 1031 in a one-to-one manner.

[0085] Further, as Figure 3 shown, the first two-stage power distribution circuit 10221 can be built with four resistors of equal resistance to form a low-frequency one-to-three power divider. The first two-stage power distribution circuit 10221 evenly distributes the power of the filtered signal (for example, when the input power is 19 dbm and it is attenuated by 10 dbm by the first two-stage power distribution circuit 10221, the output power of each of the three paths is 3 dbm), ensuring that the power of each frequency band signal of the filtered signal is equal. Further, as Figure 4 shown, the second two-stage power distribution circuit 10222 can be built with three resistors of equal resistance to form a high-frequency one-to-two power divider. The second two-stage power distribution circuit 10222 evenly distributes the power of the filtered signal (for example, when the input power is 10 dbm and it is attenuated by 6 dbm by the second two-stage power distribution circuit 10222, the output power of both paths is 2 dbm), ensuring that the power of each frequency band signal of the filtered signal is equal. Further, as Figures 5 to 6 shown, the third two-stage power distribution circuit 102231 of the power distribution unit 10223 can be built with four resistors of equal resistance to form a medium-frequency one-to-three power divider. The three-stage power distribution circuit 102232 of the power distribution unit 10223 can be built with nine resistors of equal resistance to form three medium-frequency one-to-three power dividers. Each one-to-three power divider of the three-stage power distribution circuit 102232 further evenly distributes the power of each path of the signal output by the third two-stage power distribution circuit 102231, and finally 6 medium-frequency signals can be obtained, and the power of each frequency band signal output can be made equal.

[0086] Further, at least one of the first signal processing unit 1031, the second signal processing unit 1032, and the third signal processing unit 1033 may further include two first filters Z1. For example: The signal processed by the first two-stage power splitting circuit 10221 sequentially flows through the two first filters Z1 for filtering, and there will be an attenuator AT between the two first filters Z1. Further, the frequency bands retained by the two first filters Z1 on the same signal link are the same. The signals of each frequency band can be further subdivided by the first filter Z1. Taking the high-frequency signal link (corresponding to the second initial signal and the second target signal) as an example, two second initial signals with the same frequency band as the high-frequency signal (for example, the custom high-frequency band range is 3300 MHz - 5950 MHz) are obtained after the processing of the second two-stage power splitting circuit 10222. Among them, the two signal output terminals of the second two-stage power splitting circuit 10222 are respectively connected to the two second signal processing units 1032. The first filters Z1 of the two second signal processing units 1032 further perform filtering respectively, so as to output two second target signals with different frequencies. For example, the frequency band of one of the second target signals is 3300 MHz - 3600 MHz, and the frequency band of the other second target signal is 4800 MHz - 5000 MHz.

[0087] The same applies to other signal links. The signal frequency bands after filtering by the first filter Z1 in each signal link are different from each other. Thus, 11 signals with different frequency bands can be finally obtained, and the 11 signals with different frequency bands can respectively correspond to the 11 actual signal usage frequency bands of the cellular communication frequency bands (703 MHz - 5000 MHz) of domestic operators from 2G to 5G.

[0088] The filtered signal enters the detector PD for detection. The detector PD outputs a voltage value according to the input signal, and this voltage value is proportional to the power of the input signal. The detector PD is, for example, an envelope detector. In this embodiment, the output terminal of the detector PD can be specifically connected to an analog-to-digital conversion circuit (not shown). The signal output by the detector PD is converted into a digital signal through the analog-to-digital conversion circuit, such as an ADC analog-to-digital conversion chip, and this digital signal can be transmitted to the control terminal.

[0089] Specifically, the first filter Z1 can be a Surface Acoustic Wave (SAW) filter (a band-pass filter is selected), and the attenuator AT can be a π-type attenuator. The SAW filter performs band-pass filtering on the signal, retaining the signals in the required frequency band and suppressing the signals outside the required frequency band. The π-type attenuator attenuates the power of the signal by changing the resistance value. The purpose of setting the π-type attenuator is to adjust the gain of each frequency band according to the requirements of the product application scenario (for example, increasing the attenuation value when close-range signal detection is needed and decreasing the attenuation value when long-range signal detection is needed).

[0090] In addition, another reason for selecting the SAW filter is that this filter is specifically designed for the radio frequency circuit of cellular communication. The signal frequency band allowed to pass through matches well with the cellular communication frequency band of the link where it is located, and it has good out-of-band suppression effect, which can effectively suppress the non-cellular communication frequency band. Moreover, even for other signals close to the cellular communication frequency band, such as the indoor wifi signal in the cellular communication frequency band close to 2.4 GHz, the wifi signal frequency band can still be filtered out by the SAW filter. The purpose of selecting two or more SAW filters is that for some detection scenarios, there are non-cellular communication frequency bands that are close to the cellular communication frequency band and have high intensity. For example, the wifi signal intensity in the indoor detection close to the 2.4 GHz frequency band is very high. In this case, the out-of-band suppression degree of using a single SAW filter may not be sufficient, so two or more can be selected and set.

[0091] It should be noted that the setting principle of multiple SAW filters is to ensure that at least one of them is located before the detector PD. Therefore, in this embodiment, the positions of the first SAW filter and the π-type attenuator AT can be interchanged. That is, in the circuit structures of the first signal processing unit 1031, the second signal processing unit 1032, and the third signal processing unit 1033, the signal output end of the second power distribution circuit 1022, the first first filter Z1, the attenuator AT, the second first filter Z1, and the detector PD are connected in sequence. Or, the signal output end of the second power distribution circuit 1022, two first filters Z1, the attenuator AT, and the detector PD are connected in sequence.

[0092] Taking the low-frequency band signal link (corresponding to the first initial signal and the first target signal) as an example, the control terminal can finally receive three digital signals in the low-frequency band with the same power. The three digital signals in the low-frequency band correspond to three cellular communication frequency bands divided in the low-frequency band, and each digital signal in the low-frequency band is used for the control terminal to calculate and determine whether the corresponding cellular communication frequency band signal is received.

[0093] Specifically, in the wireless signal acquisition circuit 10 provided in this embodiment, after the first power splitting circuit 1021 performs the first-stage power splitting process, signals in three frequency bands are generated, namely, low-frequency band signals, medium-frequency band signals, and high-frequency band signals. These three frequency band signals enter the low-frequency signal link, the medium-frequency signal link, and the high-frequency signal link respectively. In the low-frequency signal link (corresponding to the link where the first initial signal and the first target signal are located), as Figure 3 shown, the first two-stage power splitting circuit 10221 performs a second-stage power splitting process on the low-frequency band signals, splitting them into three paths of low-frequency band signals. In the high-frequency signal link (corresponding to the link where the second initial signal and the second target signal are located), as Figure 4 shown, the second two-stage power splitting circuit 10222 (optionally a one-to-two power splitter) performs a second-stage power splitting process on the high-frequency band signals, splitting them into two paths of high-frequency band signals. In the medium-frequency signal link (corresponding to the link where the third initial signal and the third target signal are located), as Figures 5 to 6 shown, the power splitting unit 10223 performs third-stage and fourth-stage power splitting processes on the medium-frequency band signals respectively, and finally outputs six paths of medium-frequency band signals. Thus, there are three paths of low-frequency band signals, six paths of medium-frequency band signals, and two paths of high-frequency band signals. The wireless signal acquisition circuit 10 of this embodiment obtains a total of 11 signals, and these 11 signals can cover the cellular communication frequency bands of 2G - 5G (703 MHz to 5000 MHz). It should be noted that the low-frequency signal link, the medium-frequency signal link, and the high-frequency signal link can use existing power splitters, or can adopt a resistor power splitting circuit composed of multiple cascaded resistors as Figures 3 to 6 shown.

[0094] Furthermore, as Figures 3 to 5 shown, the multi-stage power splitting network 102 further includes a second radio frequency amplification circuit 1023. The second radio frequency amplification circuit 1023 is arranged between the first power splitting circuit 1021 and the second power splitting circuit 1022, and is used to amplify the signals that have been power split by the first power splitting circuit 1021. In this embodiment, the second radio frequency amplification circuit 1023 may specifically include a third radio frequency amplifier A3.

[0095] Specifically, the multi-stage power splitting network 102 may further include a second filter Z2 to enhance the suppression effect on signals in non-cellular communication frequency bands.

[0096] As an embodiment, between the first output terminal of the first power splitting circuit 1021 and the first two-stage power splitting circuit 10221, 1 third radio frequency amplifier A3 and 1 second filter Z2 (optionally a low-pass filter) may be sequentially connected, as Figure 3As shown in the figure. The second radio frequency amplification circuit 1023 amplifies the first first-stage power-divided signal output by the first power-dividing circuit 1021. The second filter Z2 performs low-pass filtering on the amplified first first-stage power-divided signal to filter out non-cellular communication band signals with frequencies higher than the first first-stage power-divided signal (such as indoor Wi-Fi signals with frequencies of 2.4 GHz and 4.8 GHz), and transmits the filtered low-frequency band signal to the first second-stage power-dividing circuit 10221.

[0097] Similarly, between the second output terminal of the first power-dividing circuit 1021 and the second second-stage power-dividing circuit 10222, a third radio frequency amplifier A3 and a second filter Z2 (optionally a high-pass filter) can be sequentially connected, as Figure 4 shown in the figure. The second radio frequency amplification circuit 1023 amplifies the second first-stage power-divided signal output by the first power-dividing circuit 1021. The second filter Z2 performs high-pass filtering on the amplified second first-stage power-divided signal to filter out non-cellular communication band signals with frequencies lower than the second first-stage power-divided signal (such as indoor Wi-Fi signals with frequencies close to 2.4 GHz), and transmits the filtered high-frequency band signal to the second second-stage power-dividing circuit 10222.

[0098] As another embodiment, only the third radio frequency amplifier A3 can be provided between the third output terminal of the first power-dividing circuit 1021 and the power-dividing unit 10223, as Figure 5 shown in the figure. The second radio frequency amplification circuit 1023 amplifies the third first-stage power-divided signal output by the first power-dividing circuit 1021. Since the frequency band of the indoor Wi-Fi signal is close to the frequency band of the third first-stage power-divided signal in the middle frequency band (such as 1452 MHz - 2690 MHz), setting the second filter Z2 may filter out both the effective cellular communication band signal and the non-cellular communication band signal at the same time. Therefore, the second filter Z2 can be not provided before the power-dividing unit 10223. The second radio frequency amplification circuit 1023 directly transmits the amplified middle frequency band signal to the power-dividing unit 10223.

[0099] As an option, as Figures 3 to 5 shown in the figure, the first radio frequency amplification circuit 1011 can include a first-stage radio frequency amplification circuit 10111 and a second-stage radio frequency amplification circuit 10112 connected in series to perform multi-stage amplification processing on the radio signal so that it can reach a sufficient amplification factor to effectively offset the attenuation of the signal by the circuit. In this embodiment, the input terminal of the first-stage radio frequency amplification circuit 10111 is connected to the antenna ANT, and the first power-dividing circuit 1021 is arranged between the second-stage radio frequency amplification circuit 10112 and the second radio frequency amplification circuit 1023. Among them, the first-stage radio frequency amplification circuit 10111 includes a first radio frequency amplifier A1, and the second-stage radio frequency amplification circuit 10112 includes a second radio frequency amplifier A2.

[0100] It can be understood that the wireless signal acquisition circuit 10 in this embodiment forms a three-stage amplification, and moreover, the first power splitting circuit 1021 is between the second-stage amplification and the third-stage amplification. Compared with being arranged at other positions, for example, compared with the first power splitting circuit 1021 being arranged between the first-stage amplification and the second-stage amplification, the setting method of the first power splitting circuit 1021 in this embodiment can reduce the number of second radio frequency amplifiers A2. Compared with the first power splitting circuit 1021 being arranged between the third-stage amplification and the second filter Z2, the amplification gain of each frequency band signal after the output of the first power splitting circuit 1021 can be adjusted separately.

[0101] Further, the wireless signal acquisition circuit 10 may further include a third filter Z3, and the third filter Z2 is connected between a partial signal output end of the power splitting unit 10223 and the signal input end of the third signal processing unit 1033. As an embodiment, since different third signal processing units 1033 will further subdivide the frequency bands of the mid-frequency signals after uniform power distribution, and output third target signals of different frequency bands. Among them, the frequency bands of some of the third target signals after subdivision are far from the wifi signal frequency band (such as 2.4G). Therefore, a third filter Z3 can be arranged between the corresponding three-stage power splitting circuit 102232 and the third signal processing unit 1033 to filter out non-cellular communication frequency band signals (such as 2.4G wifi signals).

[0102] Specifically, as Figures 5 to 6 shown, the three-stage power splitting circuit 102232 further evenly distributes the power of each path of signal output by the third two-stage power splitting circuit 102231, and finally 6 mid-frequency signals can be obtained. The 6 signal output ends of the three-stage power splitting circuit 102232 respectively correspond to 6 third signal processing units 1033, so as to output 6 third target signals of different frequency bands, and for example, respectively correspond to the actual used frequency bands of 6 mid-frequency signals of domestic operators. Among them, as Figure 6As shown in the figure, taking a signal link with the third target signal corresponding frequency band of 1710 MHz - 1785 MHz as an example, a third filter Z3 (optionally a low-pass filter) can be set between the output end of the three-stage power divider circuit 102232 and the third signal processing unit 1033. In this embodiment, the third filter Z3 performs low-pass filtering on the intermediate frequency band signal output by the three-stage power divider circuit 102232, filters out non-cellular communication band signals (such as indoor wifi signals with a frequency band close to 2.4 GHz), and transmits the filtered low-frequency band signal to the third signal processing unit 1033, and the first filter Z1 of the third signal processing unit 1033 further filters it, so as to output the third target signal with a frequency band of 1710 MHz - 1785 MHz. Similarly, in other signal links where the frequency band interval between the third target signal corresponding frequency band and non-cellular communication band signals such as wifi signals is relatively far (such as signal links with the third target signal corresponding frequency band of 1885 MHz - 1915 MHz or 1920 MHz - 1980 MHz), a third filter Z3 can also be set between the output end of the three-stage power divider circuit 102232 and the third signal processing unit 1033, so as to further filter out non-cellular communication band signals.

[0103] Figure 7 It is a partial schematic diagram of the circuit module of the wireless signal acquisition circuit 10 in Embodiment 3 of the present invention. At least one of each first signal processing unit 1031, each second signal processing unit 1032, and each third signal processing unit 1033 further includes a test port S1, and the test port S1 is arranged on the path between the multi-stage power divider network 102 and the detector PD.

[0104] When the test cable is connected to the test port S1, the test port S1 disconnects the path between the output end of the multi-stage power divider network 102 and the detector PD, and is used to output the signal output by the multi-stage power divider network 102 to the test cable. When the test cable is not connected to the test port S1, the test port S1 conducts the path between the output end of the multi-stage power divider network 102 and the detector PD, and is used to output the signal output by the multi-stage power divider network 102 to the detector PD.

[0105] In this embodiment, in the signal link of each first signal processing unit 1031, second signal processing unit 1032, and / or third signal processing unit 1033, by adding a test port S1, it is convenient to debug and test the entire signal link of each frequency band from the antenna ANT to before the detector PD. Taking the second signal processing unit 1032 as an example, as Figure 7 shown, the test port S1 can be arranged between the first filter Z1 and the detector PD. The principle of the test port S1 is as Figure 8 shown. As Figure 8As shown in (a), if no test is required, the test cable is not inserted into the test port S1. At this time, the signal flows from left to right, that is, the signal normally flows from the second first filter Z1 in the second signal processing unit 1032 through the test port S1 to the detector PD. As Figure 8 As shown in (b), if a test is required, when the test cable is inserted into the test port S1, the internal spring contact of the test port S1 is pushed down by the cable thimble. At this time, the signal enters from the left and flows out from the top, that is, the signal does not flow from the second first filter Z1 of the second signal processing unit 1032 to the detector PD at the back end, but flows through the test port S1 to the test device. After the test cable is pulled out after the test, the spring contact will immediately return, and the signal flows from left to right, that is, from the second first filter Z1 to the detector PD at the back end through the test port S1 again.

[0106] Next, the working principle of the wireless signal acquisition circuit 10 of the Figures 3 - 6 embodiment shown will be described. In the wireless signal acquisition circuit 10, the antenna ANT in the signal receiving unit 101 receives a radio signal, and the first radio frequency amplification circuit 1011 amplifies the radio signal to obtain a radio frequency signal. The first power division circuit 1021 divides signals of different frequency bands from the radio frequency signal according to requirements. Signals of different frequency bands enter their respective corresponding links (that is, low-frequency signals enter the low-frequency signal link, medium-frequency signals enter the medium-frequency signal link, and high-frequency signals enter the high-frequency signal link). In each link, the signal is first amplified, then power-divided again, and finally enters the signal processing unit 103 for processing to obtain the corresponding target signal. Taking the low-frequency signal link as an example, the low-frequency signal is amplified by the second radio frequency amplification circuit 1023, and the second filter Z2 filters the amplified low-frequency signal. The filtered low-frequency signal is then transmitted to the first two-stage power division circuit 10221 for power division again, and three low-frequency signals (that is, three first initial signals) are output. After these three low-frequency signals are subjected to corresponding filtering and detection processing by the first signal processing unit 1031, three first target signals with different frequency bands are obtained. In this way, the control terminal can identify whether a signal corresponding to the cellular communication frequency band is received based on the first target signal. The working principles of the medium-frequency signal link and the high-frequency signal link are similar to that of the low-frequency signal link and will not be elaborated here.

[0107] The wireless signal acquisition circuit 10 proposed in the embodiments of the present invention can reduce the number of components by means of step-by-step power splitting. Specifically, for example, for the second radio frequency amplification circuit 1023, if the first power splitting circuit 1021 directly splits out 11 signals, then 11 second radio frequency amplification circuits 1023 would be required. However, in this embodiment, only 3 second radio frequency amplification circuits 1023 are needed (for example, 1 second radio frequency amplification circuit 1023 is actually shared by 3 first target signals), thus reducing the number of second radio frequency amplification circuits 1023. The principle of other components is similar. In short, in the embodiments of the present invention, since the signals are not directly split into the required number of signals at one time but through multiple levels of power splitting, the number of components can be reduced, which can effectively increase the distance between signal lines, better plan the layout of signal links of each frequency band on the PCB, increase the spacing between signal lines, and reduce crosstalk between lines.

[0108] In another preferred embodiment, a signal detection device is provided. The signal detection device includes the wireless signal acquisition circuit 10 as described in the above embodiment. By setting the wireless signal acquisition circuit 10, the signal detection device of this embodiment can be used to detect devices that can communicate using wireless signals. In this embodiment, by setting a multi-level power splitting network 102 in the wireless signal acquisition circuit 10, the radio frequency signals output by the signal receiving unit 101 can be subjected to multi-level power splitting processing, thereby effectively reducing crosstalk between signals of different frequency bands.

[0109] In another preferred embodiment, a wiretapping and espionage device detection device is provided. The device includes the wireless signal acquisition circuit 10 as described in the above embodiment. The wiretapping and espionage device detection device can be used to detect whether there are wiretapping devices that communicate using wireless signals, such as cameras, in the surrounding environment. In this embodiment, by setting a multi-level power splitting network 102 in the wireless signal acquisition circuit 10, the radio frequency signals output by the signal receiving unit 101 can be subjected to multi-level power splitting processing, thereby effectively reducing crosstalk between signals of different frequency bands.

[0110] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A wireless signal acquisition circuit, characterized in that: The wireless signal acquisition circuit comprises: A signal receiving unit, used for receiving a radio signal and outputting a radio frequency signal; a multi-stage power division network connected to the signal receiving unit, the multi-stage power division network being used to perform multi-stage power division processing on the radio frequency signal to obtain at least a first initial signal and a second initial signal, wherein the first initial signal and the second initial signal are respectively located in two different frequency bands of wireless communication; A signal processing unit is connected to the multi-stage power division network, and the signal processing unit is used to perform signal processing on the first initial signal and the second initial signal respectively to obtain a first target signal and a second target signal respectively.

2. The wireless signal acquisition circuit according to claim 1, characterized in that: The multi-stage power division network includes a first power division circuit and a second power division circuit: The first power division circuit is connected to the signal receiving unit and is used to perform a first-level power division process on the radio frequency signal to obtain at least a first-level power division signal and a second-level power division signal; The second power division circuit is connected to the first power division circuit, and is used to perform second-stage power division processing on the first primary power division signal and the second primary power division signal respectively to obtain the first initial signal and the second initial signal.

3. The wireless signal acquisition circuit according to claim 2, characterized in that: The first power division circuit is further used to perform first-level power division processing on the radio frequency signal to obtain a third first-level power division signal; The second power division circuit is further used for performing second-stage power division processing on the third first-stage power division signal to obtain a third initial signal; The signal processing unit is further used to perform signal processing on the third initial signal to obtain a third target signal; The frequency band of the first initial signal is lower than the frequency band of the third initial signal, and the frequency band of the third initial signal is lower than the frequency band of the second initial signal.

4. The wireless signal acquisition circuit according to claim 3, characterized in that: The number of the first initial signal, the second initial signal and the third initial signal are all multiple; The second power division circuit comprises: a first-secondary power division circuit, connected to the first power division circuit, the first-secondary power division circuit being used for performing second-level power division processing on the first-level power division signal to obtain a plurality of first initial signals; a second secondary power division circuit, connected to the first power division circuit, the second secondary power division circuit being used for performing a second-stage power division process on the second primary power division signal to obtain a plurality of second initial signals; A power division unit is connected to the first power division circuit, and is used for performing power division processing on the third primary power division signal to obtain multiple third initial signals.

5. The wireless signal acquisition circuit according to claim 4, characterized in that: The power division unit comprises: a third secondary power division circuit, connected to the first power division circuit, and configured to perform a second-stage power division process on the third primary power division signal to obtain a secondary power division signal; The three-stage power division circuit is connected to the third two-stage power division circuit, and the three-stage power division circuit is used to perform third-stage power division processing on the two-stage power division signal to obtain multiple third initial signals.

6. The wireless signal acquisition circuit according to claim 4, characterized in that: The signal processing unit comprises: A plurality of first signal processing units, each of which is connected to one of the signal output ends of the first secondary power dividing circuit to receive one of the first initial signals; each of the first signal processing units is used to perform signal processing on the received first initial signal to obtain one of the first target signals; A plurality of second signal processing units, each of which is connected to one of the signal output ends of the second secondary power dividing circuit to receive one channel of the second initial signal; each of the second signal processing units is used to perform signal processing on the received second initial signal to obtain one channel of the second target signal; Multiple third signal processing units, each of which is connected to one of the signal output ends of the power division unit to access one of the third initial signals; each of the third signal processing units is used to perform signal processing on the accessed third initial signal to obtain one of the third target signals.

7. The wireless signal acquisition circuit according to claim 6, characterized in that: At least two of the first signal processing unit, the second signal processing unit, and the third signal processing unit have the same circuit structure.

8. The wireless signal acquisition circuit according to claim 6, characterized in that: At least one of each of the first signal processing units, each of the second signal processing units, and each of the third signal processing units includes a first filter, an attenuator, and a detector, and the first filter and the attenuator are connected between the second power division circuit and the detector.

9. The wireless signal acquisition circuit according to claim 8, characterized in that: At least one of each of the first signal processing units, each of the second signal processing units, and each of the third signal processing units further comprises a test port, wherein the test port is provided on a path between the multi-stage power division network and the detector; When the test port is connected to a test cable, the test port disconnects the path between the output end of the multi-stage power division network and the detector, and is used to output the signal output by the multi-stage power division network to the test cable; When the test port is not connected to a test cable, the test port connects the path between the output end of the multi-stage power division network and the detector, and is used to output the signal output by the multi-stage power division network to the detector.

10. The wireless signal acquisition circuit according to claim 6, characterized in that: The first two-level power division circuit includes a first resistor and multiple second resistors, the first end of the first resistor is connected to the first power division circuit, the second end of the first resistor is respectively connected to the first ends of the multiple second resistors, and the second ends of the multiple second resistors are connected one-to-one to the multiple first signal processing units.

11. The wireless signal acquisition circuit according to claim 2, characterized in that: The signal receiving unit includes an antenna and a first radio frequency amplifying circuit; the antenna is used to receive a radio signal; two ends of the first radio frequency amplifying circuit are respectively connected to the antenna and the first power dividing circuit, and are used to amplify the radio signal to obtain a radio frequency signal; The multi-stage power division network also includes: A second radio frequency amplifying circuit, wherein the second radio frequency amplifying circuit is arranged between the first power dividing circuit and the second power dividing circuit.

12. A signal detection device, comprising the wireless signal acquisition circuit according to any one of claims 1 to 11.

13. A device for detecting eavesdropping or spying devices, characterized in that: The eavesdropping and spying device detection device comprises the wireless signal acquisition circuit as claimed in any one of claims 1 to 11.

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