A working mode reconfigurable multi-band radio frequency folding frequency measurement receiver

Abstract

The application discloses a working mode reconfigurable multi-band radio frequency folding frequency measurement receiver. The intermediate frequency combining circuit and the double-channel ADC circuit are connected in sequence. The intermediate frequency combining circuit has multiple channels. The intermediate frequency combining circuit and the double-channel ADC circuit are used for responding to different preset instructions, and sequentially performing combining and analysis processing on the sub-intermediate frequency signals in at least one channel in a full-band instantaneous mode, a high-sensitivity sweep frequency mode, a high-sensitivity sweep frequency fixed frequency mode or a high-sensitivity fixed frequency mode, and correspondingly obtaining first target signals to fourth target signals. The sub-intermediate frequency signals are obtained by phase shifting the intermediate frequency signals, and the intermediate frequency signals are at least one way and are obtained by frequency conversion based on corresponding source radio frequency signals. The problem that the superheterodyne receiver is restricted by the instantaneous coverage frequency range, the number of device channels and the intermediate frequency working frequency range is solved. The application has the advantages of simple hardware structure, low cost, wide instantaneous coverage frequency domain and high performance.

Description

Technical Field

[0001] The present application relates to the technical field of frequency measurement receivers for electronic countermeasures, and in particular to a multi-band radio frequency folding frequency measurement receiver with reconfigurable working modes. Background Art

[0002] In the field of frequency measurement receivers for electronic countermeasures, to improve the intercept probability of the equipment, it is necessary to maximize the intermediate frequency bandwidth and expand the instantaneous bandwidth. The only way to achieve this is to increase the number of channels or improve the analog bandwidth of the ADC. However, both increasing the number of channels and increasing the analog bandwidth of the ADC will lead to a series of problems:

[0003] (1) Increasing the number of channels will complicate the circuit and increase equipment costs;

[0004] (2) Increasing the analog bandwidth of the ADC increases the difficulty of ADC selection, and the price of ADCs with wider analog bandwidth is also high;

[0005] (3) The analog bandwidth of the ADC is relatively difficult to expand in the frequency domain compared to the working bandwidth of the receiver, and it is difficult to have an advantage for high-frequency working signals. Summary of the Invention

[0006] The main purpose of this application is to provide a multi-band RF folding frequency measurement receiver with reconfigurable working mode, aiming to solve the technical problem of the mutual constraints between the instantaneous coverage frequency range, the number of device channels and the intermediate frequency operating frequency range of the superheterodyne receiver.

[0007] To achieve the above-mentioned objectives, the present application provides a multi-band RF folding frequency measurement receiver with reconfigurable working mode, including: an intermediate frequency combining circuit and a dual-channel ADC circuit that are communicatively connected in sequence, and the intermediate frequency combining circuit has multiple channels; the intermediate frequency combining circuit and the dual-channel ADC circuit are used to respond to different preset instructions, in full-band instantaneous mode, high-sensitivity sweeping mode, high-sensitivity sweeping fixed frequency mode or high-sensitivity fixed frequency mode, to combine and analyze the sub-intermediate frequency signal in at least one channel in sequence, and obtain the first target signal to the fourth target signal accordingly, wherein the sub-intermediate frequency signal is obtained based on the phase shift of the intermediate frequency signal, and the intermediate frequency signal is at least one channel, and is obtained based on the frequency conversion of the corresponding source RF signal.

[0008] Optionally, one channel of the intermediate frequency signal is phase-shifted to obtain at least two sub-intermediate frequency signals, and there is a preset phase difference between the two adjacent sub-intermediate frequency signals; in the full-band instantaneous mode, the intermediate frequency combining circuit is used to receive the sub-intermediate frequency signals in all the channels, and the dual-channel ADC circuit is used to obtain the phase difference of the sub-intermediate frequency signals of the same intermediate frequency signal, and demodulate the sub-intermediate frequency signals of each channel according to the preset interval to which the phase difference belongs to obtain the first target signal, and the first target signal includes the source RF signals of each channel; in the high-sensitivity sweep mode, the intermediate frequency combining circuit is used to select the sub-intermediate frequency signals in at least two of the channels, and the two channels correspond to two consecutive source RF signals, and the dual-channel ADC circuit is used to obtain the intermediate frequency frequencies of the two sub-intermediate frequency signals and the intermediate frequency phases corresponding to the two channels respectively. Switch code, and demodulate the two sub-IF signals according to the IF frequency and the switch code to obtain a second target signal, which includes the two source RF signals; in the high-sensitivity swept frequency and fixed frequency mode, the IF combiner circuit is used to select the sub-IF signal in one of the channels, scan the bandwidth of the IF signal other than the selected IF signal, and the dual-channel ADC circuit is used to demodulate the selected sub-IF signal or the scanned sub-IF signal to obtain a third target signal; in the high-sensitivity fixed frequency mode, the IF combiner circuit is used to select the sub-IF signals in two channels, and the two channels are fixed, and the dual-channel ADC circuit is used to demodulate the two sub-IF signals to obtain the fourth target signal, which is the two fixed source RF signals.

[0009] Optionally, the receiver further includes: a pre-amplifier power division circuit, configured to perform power division amplification processing on the received radio frequency signals in sequence to obtain continuous frequency band signals.

[0010] Optionally, the pre-amplifier power splitter circuit includes: a first filter, used to filter the received source RF signals to obtain a first filtered signal, and send the first filtered signal; a first amplifier, used to amplify the received first filtered signal to obtain a first amplified signal, and send the first amplified signal; a first power splitter, used to distribute the power of the received first amplified signal to obtain at least one first power split signal, and send each first power split signal; a second filter, used to filter the received first power split signals to obtain corresponding continuous frequency band signals.

[0011] Optionally, the receiver further includes: a frequency conversion circuit, configured to perform frequency conversion and filtering processing on each channel of the continuous frequency band signal to obtain a corresponding intermediate frequency signal.

[0012] Optionally, the frequency conversion circuit includes at least one sub-frequency conversion circuit, and the number of the sub-frequency conversion circuits is the same as the number of the second filters. Each of the sub-frequency conversion circuits includes: a mixer, used to mix the received continuous frequency band signal with the local oscillator source signal to obtain a mixed signal, and send the mixed signal; a third filter, used to filter the received mixed signal to obtain a second filtered signal, and send the second filtered signal; a second amplifier, used to amplify the received second filtered signal to obtain an intermediate frequency signal.

[0013] Optionally, the receiver further includes: an intermediate frequency power division and phase shift channel circuit, which is used to perform power division and phase shift processing on each input intermediate frequency signal to obtain at least one corresponding sub-intermediate frequency signal, and the phase difference between two adjacent sub-intermediate frequency signals belongs to a preset range.

[0014] Optionally, the intermediate frequency power division phase shift channel circuit includes at least one sub-phase shift circuit, and the number of the sub-phase shift circuits is the same as the number of the sub-frequency conversion circuits, and each sub-phase shift circuit includes: a second power divider, used to distribute power of the received intermediate frequency signal, obtain at least two second power division signals, and send each second power division signal; multiple phase shifters 502, used to perform phase shift processing on each received second power division signal, respectively, to obtain each sub-intermediate frequency signal accordingly.

[0015] Optionally, the intermediate frequency combining circuit includes at least two combiners and each single-pole single switch group respectively connected to the input end of each combiner, and each fourth filter respectively connected to the output end of each combiner; the single-pole single switch group has at least two single-pole single switches, and each single-pole single switch group is used to select at least one sub-intermediate frequency signal in response to a preset instruction, and send the sub-intermediate frequency signal, and send the sub-intermediate frequency signal; each combiner is used to combine at least one sub-intermediate frequency signal to obtain a combined signal, and send the combined signal; each fourth filter is used to filter each received combined signal to obtain an intermediate frequency combined signal.

[0016] Optionally, the dual-channel ADC circuit includes a programmable logic device and at least two analog-to-digital converters connected to the input end of the programmable logic device, and the number of the analog-to-digital converters is equal to the number of the combiners; the analog-to-digital converter is used to perform analog-to-digital conversion on the received intermediate frequency combined signal to obtain a digital signal; the programmable logic device is used to demodulate each of the digital signals in response to the preset instruction to obtain the first target signal to the fourth target signal.

[0017] The embodiment of the present application proposes a multi-band RF folding frequency measurement receiver with reconfigurable working mode, which is connected to an intermediate frequency combiner circuit and a dual-channel ADC circuit in sequence through communication. The intermediate frequency combiner circuit has multiple channels; the intermediate frequency combiner circuit and the dual-channel ADC circuit are used to respond to different preset instructions, and in full-band instantaneous mode, high-sensitivity sweep mode, high-sensitivity sweep fixed frequency mode or high-sensitivity fixed frequency mode, sequentially combine and analyze the sub-intermediate frequency signals in at least one channel to obtain first to fourth target signals accordingly, wherein the sub-intermediate frequency signal is obtained based on the phase shift of the intermediate frequency signal, the intermediate frequency signal is at least one channel, and is obtained based on the frequency conversion of the corresponding source RF signal, which solves the problem of mutual constraints between the instantaneous coverage frequency range, the number of device channels and the intermediate frequency operating frequency range of the superheterodyne receiver, and has the advantages of simple hardware structure, low cost, wide instantaneous coverage frequency domain and high performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic block diagram of an embodiment of a multi-band RF folding frequency measurement receiver with reconfigurable working mode provided by this application;

[0019] Figure 2 A principle block diagram of a pre-amplifier power splitter circuit provided for an embodiment of a reconfigurable multi-band RF folding frequency measurement receiver in the working mode of this application;

[0020] Figure 3 A block diagram of the frequency conversion channel circuit provided for an embodiment of a reconfigurable multi-band RF folding frequency measurement receiver in accordance with the present application;

[0021] Figure 4 A block diagram of the principle of an intermediate frequency power division phase shift channel circuit provided for an embodiment of a reconfigurable multi-band RF folding frequency measurement receiver in the working mode of this application;

[0022] Figure 5 A block diagram of the principle of an intermediate frequency combining circuit provided for an embodiment of a multi-band RF folding frequency measurement receiver with reconfigurable working mode according to the present application;

[0023] Figure 6 A block diagram of a dual-channel ADC circuit provided for an embodiment of a reconfigurable multi-band RF folding frequency measurement receiver according to the present application;

[0024] Figure 7 Four reconfigurable mode diagrams are provided for an embodiment of a multi-band RF folding frequency measurement receiver with reconfigurable working modes in this application.

[0025] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0027] Reference Figure 1 The first embodiment of the present application provides a reconfigurable working mode multi-band RF folding frequency measurement receiver, and the reconfigurable working mode multi-band RF folding frequency measurement receiver may include: an intermediate frequency combiner circuit 10 and a dual-channel ADC circuit 20 that are sequentially communicatively connected, and the intermediate frequency combiner circuit 10 has multiple channels; the intermediate frequency combiner circuit 10 and the dual-channel ADC circuit 20 are used to respond to different preset instructions, in full-band instantaneous mode, high-sensitivity sweep mode, high-sensitivity sweep fixed frequency mode or high-sensitivity fixed frequency mode, to sequentially combine and analyze the sub-intermediate frequency signal in at least one channel, and obtain the first target signal to the fourth target signal accordingly, wherein the sub-intermediate frequency signal is obtained based on the phase shift of the intermediate frequency signal, and the intermediate frequency signal is at least one channel, and is obtained based on the frequency conversion of the corresponding source RF signal.

[0028] Among them, one intermediate frequency signal is phase-shifted to obtain at least two sub-intermediate frequency signals and there is a preset phase difference between the two adjacent sub-intermediate frequency signals; in the full-band instantaneous mode, the intermediate frequency combining circuit 10 is used to receive the sub-intermediate frequency signals in all channels, and the dual-channel ADC circuit 20 is used to obtain the phase difference of the sub-intermediate frequency signals of the same intermediate frequency signal, and demodulate the sub-intermediate frequency signals of each channel according to the preset interval to which the phase difference belongs to obtain a first target signal, and the first target signal includes the source RF signals of each channel; in the high-sensitivity sweep mode, the intermediate frequency combining circuit 10 is used to select the sub-intermediate frequency signals in at least two channels, the two channels correspond to two continuous source RF signals, and the dual-channel ADC circuit 20 is used to obtain the sub-intermediate frequency signals of the two channels. The intermediate frequency of the signal and the switch codes corresponding to the two channels are respectively determined, and the two sub-intermediate frequency signals are demodulated according to the intermediate frequency and the switch codes to obtain the second target signal; in the high-sensitivity swept frequency and fixed frequency mode, the intermediate frequency combining circuit 10 is used to select the sub-intermediate frequency signal in one channel, scan the bandwidth of the intermediate frequency signal other than the selected intermediate frequency signal, and the dual-channel ADC circuit 20 is used to demodulate the selected sub-intermediate frequency signal and the scanned sub-intermediate frequency signal to obtain the third target signal; in the high-sensitivity fixed frequency mode, the intermediate frequency combining circuit 10 is used to select the sub-intermediate frequency signals in two channels, and the two channels remain fixed, and the dual-channel ADC circuit 20 is used to demodulate the two sub-intermediate frequency signals to obtain the fourth target signal.

[0029] In an embodiment of the present invention, the receiver may further include a pre-amplifier power splitter circuit 30, which is configured to perform power splitter amplification processing on the received radio frequency signals in sequence to obtain continuous frequency band signals.

[0030] Specifically, the pre-amplifier power splitter circuit 30 may include a first filter 301, a first amplifier 302, a first power splitter 303, a second filter 304 and a second amplifier 305, wherein the first filter 301 is used to filter the received source RF signals to obtain a first filtered signal and send the first filtered signal; the first amplifier 302 is used to amplify the received first filtered signal to obtain a first amplified signal and send the first amplified signal; the first power splitter 303 is used to power distribute the received first amplified signal to obtain at least one first power split signal and send each first power split signal; the second filter 304 is used to filter the received first power split signals to obtain corresponding continuous frequency band signals.

[0031] For example, Figure 1 As shown, a reconfigurable X-band RF folding frequency measurement receiver includes a pre-amplifier power division circuit 30, a frequency conversion circuit 40, an intermediate frequency power division phase shift channel circuit 50, an intermediate frequency combining circuit 10 and a dual-channel ADC circuit 20. Figure 2 As shown, the pre-amplifier power splitter circuit 30 includes one input port and four output ports. The input port receives RF signals in the frequency range of 8 to 12 GHz. After filtering, amplification, power splitting, amplification, and filtering, it outputs four continuous frequency bands, with frequencies of 8 to 9 GHz, 9 to 10 GHz, 10 to 11 GHz, and 11 to 12 GHz, to the frequency conversion circuit 40. The circuit design of four second amplifiers 305 after the first power splitter 303 can increase the power of multiple signals.

[0032] In an embodiment of the present invention, the receiver may further include a frequency conversion circuit 40, which is configured to perform frequency conversion and filtering on each channel of continuous frequency band signals to obtain corresponding intermediate frequency signals.

[0033] Specifically, the frequency conversion circuit 40 includes at least one sub-frequency conversion circuit, and the number of the sub-frequency conversion circuits is the same as the number of the second filters 304. Each sub-frequency conversion circuit includes a mixer 401, a third filter 402 and a second amplifier 403, wherein the mixer 401 is used to mix the received continuous frequency band signal with the local oscillator source signal to obtain a mixed signal and send the mixed signal; the third filter 402 is used to filter the received mixed signal to obtain a second filtered signal and send the second filtered signal; the second amplifier 403 is used to amplify the received second filtered signal to obtain an intermediate frequency signal.

[0034] For example, Figure 3As shown, the frequency conversion circuit 40 includes one input port and one output port. The input port receives a radio frequency signal in the corresponding frequency range, and after down-conversion, filtering, and amplification by the built-in local oscillator, outputs an intermediate frequency signal with a frequency range of 1.3 to 2.3 GHz to the intermediate frequency power splitter and phase shifter channel circuit 50. When the input frequency range of the frequency conversion circuit 40 is 8 to 9 GHz, the frequency of the built-in local oscillator is 10.3 GHz; when the input frequency range of the frequency conversion circuit 40 is 9 to 10 GHz, the frequency of the built-in local oscillator is 11.3 GHz; when the input frequency range of the frequency conversion circuit 40 is 10 to 11 GHz, the frequency of the built-in local oscillator is 12.3 GHz; and when the input frequency range of the frequency conversion circuit 40 is 11 to 12 GHz, the frequency of the built-in local oscillator is 13.3 GHz.

[0035] In an embodiment of the present invention, the receiver may further include an intermediate frequency power division and phase shift channel circuit 50, which is used to perform power division and phase shift processing on each input intermediate frequency signal to obtain at least one corresponding intermediate frequency signal, and the phase difference between two adjacent intermediate frequency signals belongs to a preset range.

[0036] Specifically, the intermediate frequency power division phase shift channel circuit 50 includes at least one sub-phase shift circuit, and the number of the sub-phase shift circuits is the same as the number of the sub-frequency conversion circuits. Each sub-phase shift circuit includes a second power divider 501 and multiple phase shifters 502, wherein the second power divider 501 is used to perform power distribution on the received intermediate frequency signal to obtain at least two second power division signals and send each second power division signal; the multiple phase shifters 502 are used to perform phase shift processing on each received second power division signal respectively to obtain each sub-intermediate frequency signal accordingly.

[0037] For example, Figure 4 As shown, the IF power splitter and phase shifter channel circuit 50 includes one input port and two output ports. The input port receives an IF signal between 1.3 and 2.3 GHz. After power splitting and phase shifting, two IF signals, a and b, are generated, each with a phase difference within a preset range, and then transmitted to the IF combining circuit 10. The preset phase ranges for the IF power splitter and phase shifter channel circuit 50 can be -180° to -90°, -90° to -0°, 0° to 90°, and 90° to 180°.

[0038] In an embodiment of the present invention, the intermediate frequency combining circuit 10 includes at least two combiners 101 and single-pole single-switch groups 102 respectively connected to the input ends of each combiner 101, and fourth filters 103 respectively connected to the output ends of each combiner 101; the single-pole single-switch groups 102 have at least two single-pole single switches, each of which is used to select a sub-intermediate frequency signal in response to a preset instruction and transmit the sub-intermediate frequency signal; each combiner 101 is used to combine at least one sub-intermediate frequency signal to obtain a combined signal, and transmit the combined signal; each fourth filter 103 is used to filter each received combined signal to obtain an intermediate frequency combined signal.

[0039] For example, Figure 5 As shown, the intermediate frequency combining circuit 10 includes four input ports and one output port. The input port receives the intermediate frequency signal of 1.3 to 2.3 GHz, which is then processed by switching, combining, and filtering before being sent to the dual-channel ADC circuit 20. The intermediate frequency combining circuit (1) processes the first sub-intermediate frequency signals in the intermediate frequency power division phase shift channel circuit, and the intermediate frequency combining circuit (2) processes the second sub-intermediate frequency signals in the intermediate frequency power division phase shift channel circuit.

[0040] In an embodiment of the present invention, the dual-channel ADC circuit 20 includes a programmable logic device 201 and at least two analog-to-digital converters 202 connected to the input end of the programmable logic device 201, and the number of the analog-to-digital converters 202 is equal to the number of combiners 101; the analog-to-digital converter 202 is used to perform analog-to-digital conversion on a received intermediate frequency combined signal to obtain a digital signal; the programmable logic device 201 is used to demodulate each digital signal in response to a preset instruction to obtain a first target signal to a fourth target signal.

[0041] For example, Figure 6 As shown, the programmable logic device can be an FPGA, and the dual-channel ADC circuit 20 includes two input ports and one output port. The input port receives an intermediate frequency signal of 1.3 to 2.3 GHz, and after analog-to-digital conversion and data processing, the output signal is a PDW code.

[0042] like Figure 7 As shown, the receiver operating mode can be reconfigured.

[0043] Full-band instantaneous 4GHz mode: The receiver sets the single-pole single switches (1) to (8) in the intermediate frequency combiner circuit 10 to full selection, and the dual-channel ADC circuit 20 determines the actual frequency of the target signal by comparing the phase difference of the homologous signal between channels 1 and 2, and then according to the intermediate frequency value and the interval to which the phase difference value between channels 1 and 2 belongs.

[0044] High-sensitivity sweep frequency 2GHz mode: The receiver sequentially selects the two channels corresponding to the continuous radio frequency by the single-pole single switches (1) to (8) in the intermediate frequency combiner circuit 10, such as (1)(6), (3)(6), (3)(8) and (1)(8), and transmits them to the dual-channel ADC circuit 20. The two analog-to-digital converters 202 respectively determine the actual frequency of the target signal according to the selection switch code and the intermediate frequency value, so that the receiver can achieve instantaneous 2GHz sweep frequency operation in the X band. Since only one channel of the intermediate frequency combiner circuit 10 is selected at the same time, compared with the full-band instantaneous 4GHz mode, the noise is not power-synthesized, the receiver signal-to-noise ratio is better, and the sensitivity is improved by 6dB.

[0045] High-Sensitivity Swept-Frequency Fixed-Frequency 1GHz Mode: Based on mission requirements, the receiver selects one of its IF combiner circuits 10 to select a fixed single-pole single-switch to receive the corresponding 1GHz RF channel, while the other IF combiner circuit performs a 1GHz bandwidth sweep across the remaining three frequency bands. This enables real-time monitoring of key target frequency bands and full-band scanning coverage. Because only one IF combiner circuit 10 is selected at a time, compared to the full-band instantaneous 4GHz mode, noise is not power-combined, resulting in an improved receiver signal-to-noise ratio and a 6dB increase in sensitivity.

[0046] High-Sensitivity Fixed-Frequency 2GHz Mode: Based on mission requirements, the receiver selects each of the 10 IF combiner circuits to receive the corresponding 1GHz RF channel using a fixed single-pole single-switch, enabling real-time monitoring of two key target frequency bands. Since only one of the 10 IF combiner circuits is selected at a time, compared to the full-band instantaneous 4GHz mode, noise is not power-combined, resulting in a better receiver signal-to-noise ratio and a 6dB increase in sensitivity.

[0047] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A multi-band RF folding frequency measurement receiver with reconfigurable working mode, characterized in that: include: An intermediate frequency combining circuit and a dual-channel ADC circuit that are sequentially communicatively connected, wherein the intermediate frequency combining circuit has multiple channels; The intermediate frequency combining circuit and the dual-channel ADC circuit are used to respond to different preset instructions, in full-band instantaneous mode, high-sensitivity sweep mode, high-sensitivity sweep fixed frequency mode or high-sensitivity fixed frequency mode, sequentially combine and analyze the sub-intermediate frequency signals in at least one channel to obtain one target signal from the first target signal to the fourth target signal, wherein the first target signal to the fourth target signal correspond to the full-band instantaneous mode, the high-sensitivity sweep mode, the high-sensitivity sweep fixed frequency mode and the high-sensitivity fixed frequency mode, respectively, the sub-intermediate frequency signal is obtained based on the phase shift of the intermediate frequency signal, and there is at least one intermediate frequency signal, and all of them are obtained by frequency conversion of the corresponding source RF signal; wherein one path of the intermediate frequency signal is phase-shifted to obtain at least two paths of sub-intermediate frequency signals, and there is a preset phase difference between two adjacent paths of the sub-intermediate frequency signals; In the full-band instantaneous mode, the intermediate frequency combining circuit is used to receive the sub-intermediate frequency signals in all the channels, and the dual-channel ADC circuit is used to obtain the phase difference of the sub-intermediate frequency signals of the same intermediate frequency signal, and demodulate the sub-intermediate frequency signals of each channel according to the preset interval to which the phase difference belongs to obtain the first target signal, where the first target signal includes the source RF signals of each channel; In the high-sensitivity sweep mode, the intermediate frequency combiner circuit is used to select the sub-intermediate frequency signals in at least two of the channels, where the two channels correspond to two consecutive source RF signals. The dual-channel ADC circuit is used to obtain the intermediate frequency of the two sub-intermediate frequency signals and two switch codes corresponding to the two channels, respectively, and demodulate the two sub-intermediate frequency signals according to the intermediate frequency and the two switch codes to obtain a second target signal, where the second target signal includes the two source RF signals. In the high-sensitivity swept frequency and fixed frequency mode, the intermediate frequency combiner circuit is used to select the sub-intermediate frequency signal in one of the channels, scan the bandwidth of the intermediate frequency signals other than the selected intermediate frequency signal, and the dual-channel ADC circuit is used to demodulate the selected sub-intermediate frequency signal or one of the scanned sub-intermediate frequency signals to obtain a third target signal, wherein the third target signal includes one of the source RF signals; In the high-sensitivity fixed-frequency mode, the intermediate frequency combiner circuit is used to select the sub-intermediate frequency signals in the two channels, and the two channels are fixed. The dual-channel ADC circuit is used to demodulate the two sub-intermediate frequency signals to obtain a fourth target signal, which is the two fixed source RF signals.

2. The multi-band RF folding frequency measurement receiver with reconfigurable working mode according to claim 1, characterized in that: The receiver further comprises: The pre-amplifier power splitter circuit is used to perform power splitting and amplification processing on the received radio frequency signal in sequence to obtain continuous frequency band signals of various channels.

3. The multi-band RF folding frequency measurement receiver with reconfigurable working mode according to claim 2, characterized in that: The pre-amplifier power splitter circuit comprises: a first filter, configured to filter the received source RF signals to obtain first filtered signals, and send the first filtered signals; a first amplifier, configured to amplify the received first filtered signal to obtain a first amplified signal, and transmit the first amplified signal; a first power splitter, configured to perform power distribution on the received first amplified signal to obtain at least one first power split signal, and transmit each of the first power split signals; The plurality of second filters is the same as the number of the first power division signals, and each second filter is used to filter each received first power division signal to obtain each continuous frequency band signal.

4. The multi-band RF folding frequency measurement receiver with reconfigurable working mode according to claim 3, characterized in that: The receiver further comprises: The frequency conversion circuit is used to perform frequency conversion and filtering on the continuous frequency band signals of each channel to obtain the corresponding intermediate frequency signals of each channel.

5. The multi-band RF folding frequency measurement receiver with reconfigurable working mode according to claim 4, characterized in that: The frequency conversion circuit includes at least one sub-frequency conversion circuit, and the number of the sub-frequency conversion circuits is the same as the number of the first power dividers, and each of the sub-frequency conversion circuits includes: A mixer, configured to mix the received continuous frequency band signal with a local oscillator signal to obtain a mixed signal, and transmit the mixed signal; a third filter, configured to filter the received mixed signal to obtain a second filtered signal, and send the second filtered signal; The second amplifier is used to amplify the received second filtered signal to obtain the intermediate frequency signal and send the intermediate frequency signal.

6. The multi-band RF folding frequency measurement receiver with reconfigurable working mode according to claim 5, characterized in that: The receiver further comprises: The intermediate frequency power division and phase shift channel circuit is used to perform power division and phase shift processing on each input intermediate frequency signal in sequence to obtain at least one sub-intermediate frequency signal, and the phase difference between two adjacent sub-intermediate frequency signals belongs to a preset range.

7. The multi-band RF folding frequency measurement receiver with reconfigurable working mode according to claim 6, characterized in that: The intermediate frequency power division phase shift channel circuit includes at least one sub-phase shift circuit, and the number of the sub-phase shift circuits is the same as the number of the sub-frequency conversion circuits, and each of the sub-phase shift circuits includes: a second power splitter, configured to perform power distribution on the received intermediate frequency signal to obtain at least two second power split signals, and transmit each of the second power split signals; A plurality of phase shifters are used to perform phase shift processing on each of the received second power division signals, obtain the corresponding sub-intermediate frequency signals of each channel, and send the sub-intermediate frequency signals of each channel.

8. The multi-band RF folding frequency measurement receiver with reconfigurable working mode according to claim 1, characterized in that: The intermediate frequency combining circuit includes at least two combiners and single-pole single-switch groups respectively connected to the input ends of the combiners, and fourth filters respectively connected to the output ends of the combiners; The single-pole single-switch group comprises at least two single-pole single switches, each of the single-pole single-switch groups being used to select at least one of the sub-IF signals in response to a preset instruction and transmit each of the sub-IF signals; Each of the combiners is used to combine at least one of the sub-IF signals to obtain a combined signal, and send the combined signal; Each of the fourth filters is used to filter each of the received combined signals to obtain an intermediate frequency combined signal.

9. The multi-band RF folding frequency measurement receiver with reconfigurable working mode according to claim 8, characterized in that: The dual-channel ADC circuit includes a programmable logic device and at least two analog-to-digital converters connected to the input end of the programmable logic device, and the number of the analog-to-digital converters is equal to the number of the combiners; Each of the analog-to-digital converters is used to perform analog-to-digital conversion on each of the received intermediate frequency combined signals to obtain a digital signal; The programmable logic device is used to demodulate each of the digital signals in response to the preset instruction to obtain one target signal from the first to fourth target signals.

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