Ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing

Abstract

The invention relates to the technical field of electronic reconnaissance, in particular to an ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing. The receiver comprises an optical frequency comb pulse laser source M1, an optical frequency comb pulse laser source M2, a low-noise amplifier LNA1, a low-noise amplifier LNA2, a numerical control attenuator AGC, a power divider PS, a polarization controller PC1, a polarization controller PC2, an electro-optical modulator MZM1, an electro-optical modulator MZM2, a photoelectric detector PD1, a photoelectric detector PD2, an optical coupler OC1, an optical coupler OC2, a low-pass filter LF1 and a low-pass filter LF2. The output end of the low-pass filter LF1 and the output end of the low-pass filter LF2 are connected with the signal processing module FPGA; the low noise amplifier LNA1 is connected with the output end of the antenna RA, and the radio frequency output of the antenna RA is divided into two paths to enter the electro-optical modulator MZM1 and the electro-optical modulator MZM2 after passing through the power divider PS. The receiver can realize instantaneous electromagnetic information interception in an ultra-wideband range on the basis of meeting the index of light weight of equipment.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of electronic reconnaissance technology, and in particular to an ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing. Background Art

[0002] Traditional electromagnetic reconnaissance systems generally use direct detection receivers, instantaneous frequency measurement receivers, or superheterodyne receivers for electromagnetic reconnaissance reception. These receivers all have certain shortcomings and are difficult to cope with the challenges brought by emerging anti-interception and anti-eavesdropping technologies such as frequency agility, pulse compression, burst communication, and spread spectrum communication. They cannot adapt well to the future electromagnetic reconnaissance needs of ultra-wideband frequency domain and full interception in the time domain. Direct detection receivers are mainly used in scenes with relatively simple signal environments such as millimeter waves. The instantaneous bandwidth can reach 110GHz. It uses a detector diode to detect the signal and only retains the time domain information. This results in the lack of frequency domain dimension in signal identification, and the inability to complete the radiation source identification process. It lacks adaptability in the low frequency band (below 18GHz) where the signals overlap and mix. The instantaneous frequency measurement receiver is mainly used for rapid frequency domain interception. The instantaneous bandwidth can cover 2GHz to 18GHz, which cannot meet the requirements of intercepting ultra-short wave band signals. In addition, when the signals overlap in the time domain, it will only give the frequency information of the larger amplitude signal, and discard the smaller amplitude signal (signal amplitude difference is greater than 6dB) or give the wrong frequency information (signal amplitude difference is less than 6dB). The superheterodyne receiver has the advantages of high sensitivity and large instantaneous bandwidth, but it cannot instantly cover all threat frequency bands, and has a complex structure, large size, and high cost. The instantaneous bandwidth is limited by the ADC sampling frequency, which is generally 1GHz at present. The realization of ultra-wideband reception requires multi-channel parallel processing, which will greatly increase the complexity of the superheterodyne receiver algorithm processing and bring burdens to multiple factors such as volume, weight, power consumption, and cost.

[0003] In engineering, many factors such as system size, weight, power consumption, and cost must be balanced. Traditional superheterodyne receivers, direct detection receivers, and instantaneous frequency measurement receivers all have obvious shortcomings. To achieve the instantaneous full bandwidth requirements required for modern electromagnetic reconnaissance, it is necessary to use one or more of the above receivers in combination, and a comprehensive consideration must be made between lack of capability or high cost. Summary of the invention

[0004] In order to solve the above technical problems, the embodiments of the present application propose an ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing, which can realize instantaneous, ultra-wideband electromagnetic information interception on the basis of meeting the lightweight index of the equipment, and has good technical advancement and application adaptability.

[0005] In order to achieve the above-mentioned purpose, an embodiment of the present application proposes an ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing, wherein the receiver includes: an optical frequency comb pulse laser source M1, an optical frequency comb pulse laser source M2, a low noise amplifier LNA1, a low noise amplifier LNA2, a digitally controlled attenuator AGC, a power divider PS, a polarization controller PC1, a polarization controller PC2, an electro-optical modulator MZM1, an electro-optical modulator MZM2, a photodetector PD1, a photodetector PD2, an optical coupler OC1, an optical coupler OC2, a low-pass filter LF1 and a low-pass filter LF2; the output of the optical frequency comb pulse laser source M1 is connected to the input end of the polarization controller PC1 through the optical coupler OC1, the output of the polarization controller PC1 is connected to the optical input end of the electro-optical modulator MZM1, the optical output end of the electro-optical modulator MZM1 is connected to the optical input end of the photodetector PD1, and the radio frequency output end of the photodetector PD1 is connected to the low The output of the optical frequency comb pulse laser source M2 is connected to the input end of the polarization controller PC2 through the optical coupler OC2, the output of the polarization controller PC2 is connected to the optical input end of the electro-optical modulator MZM2, the optical output end of the electro-optical modulator MZM2 is connected to the optical input end of the photodetector PD2, the radio frequency output end of the photodetector PD2 is connected to the input end of the low-pass filter LF2, and the output end of the low-pass filter LF2 is connected to the signal processing module FPGA; the low-noise amplifier LNA1 is connected to the output end of the antenna RA, the radio frequency output of the antenna RA is connected to the input end of the power divider PS after passing through the low-noise amplifier LNA1, the digitally controlled attenuator AGC and the low-noise amplifier LNA2, and the two outputs of the power divider PS are respectively connected to the radio frequency input ends of the electro-optical modulator MZM1 and the electro-optical modulator MZM2.

[0006] In some optional embodiments, the RF signal received by the antenna RA is sequentially amplified by the low noise amplifier LNA1, attenuated by the digitally controlled attenuator AGC, and amplified by the low noise amplifier LNA2, and then enters the power divider PS and is divided into two paths, wherein the RF signal after the first path is processed enters the electro-optical modulator MZM1, and the RF signal after the second path is processed enters the electro-optical modulator MZM2.

[0007] In some optional embodiments, the optical frequency comb signal generated by the optical frequency comb pulse laser source M1 is injected into the electro-optical modulator MZM1 after passing through the optical coupler OC1 and the polarization controller PC1. The electro-optical modulator MZM1 performs electro-optical modulation based on the input first processed RF signal and the input optical frequency comb signal to obtain a modulated signal and input it to the photodetector PD1 to realize the conversion from optical signal to electrical signal. The output of the photodetector PD1 is filtered by the low-pass filter LF1 to obtain the first intermediate frequency signal and input it to the signal processing module FPGA.

[0008] In some optional embodiments, the optical frequency comb signal generated by the optical frequency comb pulse laser source M2 is injected into the electro-optical modulator MZM1 after passing through the optical coupler OC2 and the polarization controller PC2. The electro-optical modulator MZM2 performs electro-optical modulation based on the input second processed RF signal and the input optical frequency comb signal to obtain a modulated signal and input it to the photodetector PD2 to realize the conversion from optical signal to electrical signal. The output of the photodetector PD2 is filtered by the low-pass filter LF2 to obtain the second intermediate frequency signal and input it to the signal processing module FPGA.

[0009] In some optional embodiments, the signal processing module FPGA is used to perform analog-to-digital conversion on the two input intermediate frequency signals, and based on the frequencies of the two intermediate frequency signals and the repetition frequency of the optical frequency comb laser source, the frequency, pulse width, amplitude, and repetition period of the RF signal are solved.

[0010] In some optional embodiments, the signal processing module FPGA is also connected to the digital controlled attenuator AGC via a TTL interface; the signal processing module FPGA is also used to dynamically adjust the attenuation of the digital controlled attenuator AGC based on the calculated amplitude of the RF signal. The larger the amplitude of the RF signal, the greater the attenuation of the set digital controlled attenuator AGC.

[0011] In some optional embodiments, the repetition frequency of the optical frequency comb pulse laser source M1 is different from the repetition frequency of the optical frequency comb pulse laser source M2 and has a small frequency difference.

[0012] In some optional embodiments, the frequency of the low-pass filter LF1 and the frequency of the low-pass filter LF2 are both greater than the repetition rate of the optical frequency comb pulse laser source M1 and the repetition rate of the optical frequency comb pulse laser source M2, and are both less than twice the repetition rate of the optical frequency comb pulse laser source M1 and twice the repetition rate of the optical frequency comb pulse laser source M2.

[0013] In some optional embodiments, the gains of the low noise amplifier LNA1 and the low noise amplifier LNA2 are both 20 dB.

[0014] In some optional embodiments, each module in the receiver is also connected to a secondary power supply SP, and the secondary power supply SP is used to supply power to each module in the receiver.

[0015] The present application proposes an ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing, which has the following advantages compared to traditional reconnaissance receivers.

[0016] First, it has the capability of ultra-wideband frequency domain and instantaneous interception in time domain. The reconnaissance receiver proposed in this application realizes the detection of space electromagnetic signals through the dual optical frequency comb optical undersampling technology, and can achieve full spectrum coverage and instantaneous interception of ultra-wideband (30MHz to 18GHz) radio frequency signals.

[0017] Second, it has good in-band intermodulation and spurious suppression characteristics. The reconnaissance receiver proposed in this application, based on the microwave photon frequency conversion technology system, can effectively avoid the in-band intermodulation and harmonic noise introduced by the traditional electrical domain local oscillator frequency conversion processing method, and effectively improve the signal quality.

[0018] Third, it has the characteristics of low cost, light weight and low power consumption. The reconnaissance receiver proposed in this application is based on microwave photonic technology of optical frequency comb compression. The signal processing module only needs to sample the compressed signal, which reduces the requirements for hardware resources and the pressure of ADC sampling, helps to reduce costs and increase the number of AD quantization bits. At the same time, it avoids the weight and power consumption limitations of electrical domain broadband scanning equipment. The system weight is no more than 3kg and the power consumption is no more than 15W.

[0019] In summary, the ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing proposed in this application has achieved significant improvements in in-band intermodulation and spurious suppression, time-sensitive signal interception, and low power consumption, providing a new and efficient solution for the field of modern electronic reconnaissance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related technologies, the drawings required for use in the embodiments of the present application or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a structural schematic diagram of an ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing provided in one embodiment of the present application;

[0022] Figure 2 is a schematic diagram of an optical frequency comb pulse laser source provided in one embodiment of the present application;

[0023] Figure 3 is a schematic diagram of a polarization controller provided in one embodiment of the present application;

[0024] Figure 4 is a schematic diagram of an electro-optic modulator provided in one embodiment of the present application;

[0025] Figure 5is a schematic diagram of a photodetector provided in one embodiment of the present application;

[0026] Figure 6 is a schematic diagram of a power divider provided in one embodiment of the present application;

[0027] Figure 7 is a schematic diagram of a low noise amplifier provided in one embodiment of the present application;

[0028] Figure 8 is a schematic diagram of a low-pass filter provided in one embodiment of the present application;

[0029] Fig. 9 is a schematic diagram of a signal processing module provided in one embodiment of the present application;

[0030] Fig.10 is a schematic diagram of an antenna provided in one embodiment of the present application;

[0031] Fig.11 It is a spectrum characteristic and spectrum characteristic diagram of an optical frequency comb signal of an optical frequency comb pulse laser source provided in one embodiment of the present application;

[0032] Fig.12 This is a diagram of output results after 30 MHz and 18 GHz modulation provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. In the various embodiments of the present application, many technical details are proposed in order to make the reader better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can also be implemented. The division of the following embodiments is only for the convenience of description, and the specific implementation mode of the present application should not constitute any limitation. The various embodiments can be combined with each other and referenced to each other under the premise of no contradiction.

[0034] An embodiment of the present application proposes an ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing. The following is a detailed description of the implementation details of the ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing proposed in this embodiment. The following content is only for the convenience of understanding the implementation details and is not necessary for the implementation of this solution. The specific structure of the ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing proposed in this embodiment is as follows: Figure 1As shown, it includes: an optical frequency comb pulse laser source M1, an optical frequency comb pulse laser source M2, a low noise amplifier LNA1, a low noise amplifier LNA2, a digitally controlled attenuator AGC, a power divider PS, a polarization controller PC1, a polarization controller PC2, an electro-optical modulator MZM1, an electro-optical modulator MZM2, a photodetector PD1, a photodetector PD2, an optical coupler OC1, an optical coupler OC2, a low-pass filter LF1 and a low-pass filter LF2.

[0035] The output of the optical frequency comb pulse laser source M1 is connected to the input end of the polarization controller PC1 through the optical coupler OC1, the output of the polarization controller PC1 is connected to the optical input end of the electro-optic modulator MZM1, the optical output end of the electro-optic modulator MZM1 is connected to the optical input end of the photodetector PD1, the radio frequency output end of the photodetector PD1 is connected to the input end of the low-pass filter LF1, and the output end of the low-pass filter LF1 is connected to the signal processing module FPGA.

[0036] The output of the optical frequency comb pulse laser source M2 is connected to the input end of the polarization controller PC2 through the optical coupler OC2, the output of the polarization controller PC2 is connected to the optical input end of the electro-optic modulator MZM2, the optical output end of the electro-optic modulator MZM2 is connected to the optical input end of the photodetector PD2, the radio frequency output end of the photodetector PD2 is connected to the input end of the low-pass filter LF2, and the output end of the low-pass filter LF2 is connected to the signal processing module FPGA.

[0037] The low noise amplifier LNA1 is connected to the output end of the antenna RA. The RF output of the antenna RA is connected to the input end of the power divider PS after passing through the low noise amplifier LNA1, the digitally controlled attenuator AGC and the low noise amplifier LNA2. The two outputs of the power divider PS are respectively connected to the RF input ends of the electro-optical modulator MZM1 and the electro-optical modulator MZM2.

[0038] The following describes the working principle of an ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing proposed in this embodiment from the perspective of signal (data) flow.

[0039] The antenna RA can receive the radio frequency signal sent from the outside in real time. The radio frequency signal received by the antenna RA enters the power divider PS after being amplified by the low noise amplifier LNA1, attenuated by the digital controlled attenuator AGC, and amplified by the low noise amplifier LNA2, and is divided into two paths by the power divider PS. Among them, the radio frequency signal after the first path is processed enters the electro-optical modulator MZM1, and the radio frequency signal after the second path is processed enters the electro-optical modulator MZM2.

[0040] The optical frequency comb signal generated by the optical frequency comb pulse laser source M1 is injected into the electro-optic modulator MZM1 after passing through the optical coupler OC1 and the polarization controller PC1. The electro-optic modulator MZM1 performs electro-optical modulation based on the input first processed RF signal and the input optical frequency comb signal to obtain a modulated signal and input it to the photodetector PD1 to realize the conversion from optical signal to electrical signal. The output of the photodetector PD1 is filtered by the low-pass filter LF1 to obtain the first intermediate frequency signal and input it to the signal processing module FPGA.

[0041] The optical frequency comb signal generated by the optical frequency comb pulse laser source M2 is injected into the electro-optic modulator MZM1 after passing through the optical coupler OC2 and the polarization controller PC2. The electro-optic modulator MZM2 performs electro-optical modulation based on the input second processed RF signal and the input optical frequency comb signal to obtain a modulated signal and input it to the photodetector PD2 to realize the conversion from optical signal to electrical signal. The output of the photodetector PD2 is filtered by the low-pass filter LF2 to obtain the second intermediate frequency signal and input it to the signal processing module FPGA.

[0042] After receiving the two intermediate frequency signals output by the reconnaissance receiver, the signal processing module FPGA can perform analog-to-digital conversion on the two intermediate frequency signals input, and solve the frequency, pulse width, amplitude, and repetition period of the RF signal based on the frequency of the two intermediate frequency signals and the repetition frequency of the optical frequency comb laser source. The signal processing module FPGA is mainly composed of ADC chips, high-performance FPGA chips, and other auxiliary circuits. The ADC chip is used to realize AD conversion. By building a butterfly operation complex multiplier in the FPGA, the center frequency, bandwidth and other frequency domain parameters of the signal after down-conversion are obtained in the form of sliding window FFT. The frequency difference and repetition frequency difference of the two RF signals (intermediate frequency signals) of the same frame are processed by the defuzzification algorithm based on phase residue matching to complete the frequency defuzzification, and the time domain parameter measurement is performed by channel detection, and the measurement results are sent to the terminal host computer through the network port.

[0043] In one example, the signal processing module FPGA is also connected to the digital controlled attenuator AGC through a TTL interface. The signal processing module FPGA is also used to dynamically adjust the attenuation of the digital controlled attenuator AGC based on the calculated amplitude of the RF signal. The larger the amplitude of the RF signal, the larger the attenuation of the set digital controlled attenuator AGC. Similarly, the smaller the amplitude of the RF signal, the smaller the attenuation of the set digital controlled attenuator AGC.

[0044] In one example, the repetition frequency of the optical frequency comb pulse laser source M1 is different from the repetition frequency of the optical frequency comb pulse laser source M2 and has a small frequency difference.

[0045] In one example, the repetition rate of the optical frequency comb pulse laser source M1 is 181.7 MHz, and the repetition rate of the optical frequency comb pulse laser source M2 is 183.4 MHz.

[0046] In an example, the frequency of the low-pass filter LF1 and the frequency of the low-pass filter LF2 are both greater than the repetition rate of the optical frequency comb pulse laser source M1 and the repetition rate of the optical frequency comb pulse laser source M2, and are both less than twice the repetition rate of the optical frequency comb pulse laser source M1 and twice the repetition rate of the optical frequency comb pulse laser source M2.

[0047] In an example, the repetition frequency of the optical frequency comb pulse laser source M1 is 181.7 MHz, the repetition frequency of the optical frequency comb pulse laser source M2 is 183.4 MHz, and the frequencies of the low-pass filters LF1 and LF2 are both 200 MHz.

[0048] In one example, the gains of the low noise amplifier LNA1 and the low noise amplifier LNA2 are both 20 dB.

[0049] In one example, each module in the receiver is also connected to a secondary power supply SP, which is used to supply power to each module in the receiver. The secondary power supply SP is composed of a filter circuit, a DC-DC conversion module and related structural components.

[0050] In one example, a frequency comb pulse laser source can be Figure 2 As shown, the polarization controller can be Figure 3 As shown, the electro-optic modulator can be Figure 4 As shown, the photodetector can be Figure 5 As shown, the power divider can be Figure 6 As shown, the low noise amplifier can be Figure 7 As shown, the low-pass filter can be Figure 8 As shown, the signal processing module can be Fig. 9 As shown, the antenna can be Fig.10 shown.

[0051] It is understandable that the electro-optic modulator will load the RF signal onto the optical signal inside it. Due to the special optical undersampling effect of the optical frequency comb, it will down-convert the high-frequency signal distributed in the broadband range to each repetition frequency interval. Since the signals in all repetition frequency intervals are equivalent, only the first repetition frequency interval needs to be detected to achieve the reception of all frequency signals in the working frequency band. The spectrum before and after the modulation of the optical frequency comb is as follows: Fig.11 and Fig.12 The optical frequency comb signal modulated by the electro-optic modulator is sent to the photoelectric detector to complete the photoelectric conversion, and the converted electrical signal is filtered by a low-pass filter to retain the signal in the first repetition frequency interval, and then the filtered signal is sent to the signal processing module for processing.

[0052] The ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing proposed in this embodiment has the following advantages compared to traditional reconnaissance receivers.

[0053] First, it has frequency domain ultra-wideband and time domain instantaneous interception capabilities. The reconnaissance receiver proposed in this embodiment realizes the detection of space electromagnetic signals through dual optical frequency comb optical undersampling technology, and can achieve full spectrum coverage and instantaneous interception of ultra-wideband (30MHz to 18GHz) radio frequency signals.

[0054] Second, it has good in-band intermodulation and spurious suppression characteristics. The reconnaissance receiver proposed in this embodiment is based on the microwave photon frequency conversion technology system, which can effectively avoid the in-band intermodulation and harmonic noise introduced by the traditional electrical domain local oscillator frequency conversion processing method, and effectively improve the signal quality.

[0055] Third, it has the characteristics of low cost, light weight and low power consumption. The reconnaissance receiver proposed in this embodiment is based on microwave photonic technology of optical frequency comb compression. The signal processing module only needs to sample the compressed signal, which reduces the requirements for hardware resources and the pressure of ADC sampling, helps to reduce costs and increase the number of AD quantization bits. At the same time, it avoids the weight and power consumption limitations of electrical domain broadband scanning equipment. The system weight is no more than 3kg and the power consumption is no more than 15W.

[0056] In summary, the ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing proposed in this embodiment has achieved significant improvements in in-band intermodulation and spurious suppression, time-sensitive signal interception, low power consumption, etc., providing a new and efficient solution for the field of modern electronic reconnaissance.

[0057] It is worth mentioning that all modules involved in this embodiment are logic modules. In practical applications, a logic unit can be a physical unit, a part of a physical unit, or a combination of multiple physical units. In addition, in order to highlight the innovative part of this application, this embodiment does not introduce units that are not closely related to solving the technical problems proposed by this application, but this does not mean that there are no other units in this embodiment.

[0058] Those skilled in the art will appreciate that the above embodiments are specific embodiments for implementing the present application, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present application.

Claims

1. An ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing, characterized in that: include: Optical frequency comb pulse laser source M1, optical frequency comb pulse laser source M2, low noise amplifier LNA1, low noise amplifier LNA2, digitally controlled attenuator AGC, power divider PS, polarization controller PC1, polarization controller PC2, electro-optic modulator MZM1, electro-optic modulator MZM2, photodetector PD1, photodetector PD2, optical coupler OC1, optical coupler OC2, low pass filter LF1 and low pass filter LF2; The output of the optical frequency comb pulse laser source M1 is connected to the input end of the polarization controller PC1 through the optical coupler OC1, the output of the polarization controller PC1 is connected to the optical input end of the electro-optic modulator MZM1, the optical output end of the electro-optic modulator MZM1 is connected to the optical input end of the photodetector PD1, the radio frequency output end of the photodetector PD1 is connected to the input end of the low-pass filter LF1, and the output end of the low-pass filter LF1 is connected to the signal processing module FPGA; The output of the optical frequency comb pulse laser source M2 is connected to the input end of the polarization controller PC2 through the optical coupler OC2, the output of the polarization controller PC2 is connected to the optical input end of the electro-optic modulator MZM2, the optical output end of the electro-optic modulator MZM2 is connected to the optical input end of the photodetector PD2, the radio frequency output end of the photodetector PD2 is connected to the input end of the low-pass filter LF2, and the output end of the low-pass filter LF2 is connected to the signal processing module FPGA; The low noise amplifier LNA1 is connected to the output end of the antenna RA. The RF output of the antenna RA is connected to the input end of the power divider PS after passing through the low noise amplifier LNA1, the digitally controlled attenuator AGC and the low noise amplifier LNA2. The two outputs of the power divider PS are respectively connected to the RF input ends of the electro-optical modulator MZM1 and the electro-optical modulator MZM2.

2. The ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing according to claim 1 is characterized in that: The RF signal received by the antenna RA is amplified by the low noise amplifier LNA1, attenuated by the digital controlled attenuator AGC, and amplified by the low noise amplifier LNA2, and then enters the power divider PS and is divided into two paths. The RF signal after the first path is processed enters the electro-optical modulator MZM1, and the RF signal after the second path is processed enters the electro-optical modulator MZM2.

3. The ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing according to claim 2 is characterized in that: The optical frequency comb signal generated by the optical frequency comb pulse laser source M1 is injected into the electro-optic modulator MZM1 after passing through the optical coupler OC1 and the polarization controller PC1. The electro-optic modulator MZM1 performs electro-optical modulation based on the input first processed RF signal and the input optical frequency comb signal to obtain a modulated signal and input it to the photodetector PD1 to realize the conversion from optical signal to electrical signal. The output of the photodetector PD1 is filtered by the low-pass filter LF1 to obtain the first intermediate frequency signal and input it to the signal processing module FPGA.

4. The ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing according to claim 3 is characterized in that: The optical frequency comb signal generated by the optical frequency comb pulse laser source M2 is injected into the electro-optic modulator MZM1 after passing through the optical coupler OC2 and the polarization controller PC2. The electro-optic modulator MZM2 performs electro-optical modulation based on the input second processed RF signal and the input optical frequency comb signal to obtain a modulated signal and input it to the photodetector PD2 to realize the conversion from optical signal to electrical signal. The output of the photodetector PD2 is filtered by the low-pass filter LF2 to obtain the second intermediate frequency signal and input it to the signal processing module FPGA.

5. The ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing according to claim 4 is characterized in that: The signal processing module FPGA is used to perform analog-to-digital conversion on the two input intermediate frequency signals, and based on the frequencies of the two intermediate frequency signals and the repetition frequency of the optical frequency comb laser source, the frequency, pulse width, amplitude, and repetition period of the RF signal are solved.

6. The ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing according to claim 5, characterized in that: The signal processing module FPGA is also connected to the digital controlled attenuator AGC through a TTL interface; The signal processing module FPGA is also used to dynamically adjust the attenuation of the digital controlled attenuator AGC based on the calculated amplitude of the RF signal. The larger the amplitude of the RF signal, the greater the attenuation of the digital controlled attenuator AGC is set.

7. An ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing according to any one of claims 1 to 6, characterized in that: The repetition frequency of the optical frequency comb pulse laser source M1 is different from the repetition frequency of the optical frequency comb pulse laser source M2 and has a small frequency difference.

8. An ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing according to any one of claims 1 to 6, characterized in that: The frequencies of the low-pass filter LF1 and the low-pass filter LF2 are both greater than the repetition rates of the optical frequency comb pulse laser source M1 and the optical frequency comb pulse laser source M2, and are both less than twice the repetition rates of the optical frequency comb pulse laser source M1 and the optical frequency comb pulse laser source M2.

9. An ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing according to any one of claims 1 to 6, characterized in that: The gains of the low noise amplifier LNA1 and the low noise amplifier LNA2 are both 20 dB.

10. An ultra-wideband lightweight electromagnetic reconnaissance receiver based on electro-optical sensing according to any one of claims 1 to 6, characterized in that: Each module in the receiver is also connected to a secondary power supply SP, and the secondary power supply SP is used to supply power to each module in the receiver.

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