Photonics beam domain receiving blind source separation device and method for main lobe interference

Abstract

The invention provides a photonics beam domain receiving large-bandwidth blind source separation device and method for main lobe interference, and belongs to the technical field of wireless communication. The device comprises an optical domain multi-beam receiving module, an optical domain convolution mixing-instantaneous mixing conversion module and an optical domain instantaneous mixing blind source separation module. The optical domain multi-beam receiving module estimates an arrival angle of an antenna array element receiving signal, and the optical delay network constructs a plurality of receiving beams according to the arrival angle to realize synchronous receiving of a mixed signal; the variable optical delay array realizes delay synchronization of different receiving beams and completes conversion from optical domain convolution mixing to instantaneous mixing; and the optical domain instantaneous mixed blind source separation module completes extraction of a target signal through optical domain amplitude weighted iterative optimization. The photonics beam domain reception large-bandwidth blind source separation device and method have the advantages of being wide in working frequency band range, large in bandwidth and low in energy consumption, interference in a beam main lobe is effectively restrained, and the anti-interference capacity of a phased-array antenna is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of wireless communications, and relates to a device and method for photonic beam domain reception blind source separation for main lobe interference. Background Art

[0002] Phased array antennas are antenna arrays composed of multiple antenna elements arranged according to certain rules. They form beamforming and achieve beam scanning by changing the amplitude and phase of the antenna elements. They are widely used in radar systems. With the rapid development of communication technology, phased array antennas have also received great attention in new generation wireless communication fields such as 5G and 6G, and have been gradually applied.

[0003] Phased array antennas are used in wireless communication systems, which is also based on the beamforming mechanism. The rapid development of the new generation of wireless communication technology faces the challenges of increasingly complex electromagnetic environments and increasingly severe interference. The signal received by the phased array antenna is a mixed signal containing the target signal and the interference signal. Especially when the main lobe of the receiving beam contains the interference signal, the interference to the target signal is extremely serious. Traditional sidelobe cancellation, sidelobe blanking, adaptive filtering and other methods are difficult to effectively remove it. Therefore, mainlobe interference is a key problem that must be solved when using phased array antennas in complex electromagnetic environments.

[0004] The following are several well-known literature technologies:

[0005] Prior art [1] uses the spatial polarization characteristics of antennas to suppress main-lobe interference (Dai Huanyao, Wang Xuesong, Li, Yongzhen, Liu, Yong, Xiao, Shunping. Main-lobe jamming suppression method of using spatial polarization characteristics of antennas [J]. IEEE Transactions on Aerospace and Electronic Systems, 2012, 48 (3): 2167-2179).

[0006] This technology uses the slowly changing polarization characteristics of the antenna when scanning in the airspace to process the received interference signal, obtain the orthogonal polarization echo and the estimation of the polarization state, and then perform polarization filtering with the optimal polarization to achieve the purpose of suppressing interference. This method requires that each channel must be a polarization channel, so the cost is high and is not conducive to practical engineering applications.

[0007] Prior art [2] (Li Shuai, Ning Liyue, Yang Xiaopeng, Zeng Tao, Long Teng. Main lobe interference suppression algorithm for broadband constant beamwidth beamforming [J]. Aviation Weapons, 2016, 23(6): 21-24). This technology constructs a frequency-band blocking matrix to target the main lobe interference of broadband beamforming, implements interference cancellation preprocessing in the data domain, compensates for the signal envelope error caused by the preprocessing, and uses the second-order cone programming method to achieve a constant beamwidth design of the broadband beam at the frequency center of each frequency band, thereby suppressing the main lobe interference while achieving distortion-free reception of the desired signal.

[0008] In the prior art [3] (Yang Shuning, Yang Zhongping, Zhang Jianyun, Zhou Qingsong. Spatial-polarization domain joint anti-mainlobe interference method based on sparse reconstruction [J]. Signal Processing, 2022, 38(2): 401-409), this technology uses sparse reconstruction to estimate the angle of arrival of the interference signal, and then estimates the polarization parameters of the interference signal based on the principle of maximum correlation based on the constant modulus constraint; finally, the estimated signal steering vector is used to construct a spatial-polarization domain joint oblique projection filter for interference suppression.

[0009] Although the above technology shows good characteristics in solving the main lobe interference problem of phased antenna array system, it is limited by the electronic bottleneck of signal acquisition and processing, and it is difficult for the above technical solution to effectively suppress the main lobe interference under large bandwidth conditions. Summary of the invention

[0010] The present invention provides a device and method for blind source separation of photonic beam domain reception for main lobe interference, which effectively solves the problems in the background technology such as difficulty in suppressing main lobe interference, complex structure of array element domain processing system, narrow bandwidth of signal acquisition and processing, etc.

[0011] In order to achieve the above object, the technical solution adopted by the present invention is:

[0012] A device and method for blind source separation of photonic beam domain reception for main lobe interference, characterized in that the device comprises: an optical domain multi-beam receiving module, an optical domain convolution mixing-instantaneous mixing conversion module, and an optical domain instantaneous mixing blind source separation module;

[0013] The optical domain multi-beam receiving module includes: a first receiving antenna, a second receiving antenna, ..., a Pth receiving antenna, a P+1th receiving antenna, ..., an Nth receiving antenna, a first laser light source, a second laser light source, ..., a Pth laser light source, a first electro-optical conversion unit, a second electro-optical conversion unit, ..., a Pth electro-optical conversion unit, a photonic arrival angle estimation unit, and a beam receiving delay network. The first receiving antenna and the first electro-optical conversion unit are connected in sequence via a cable or a microstrip line; the second receiving antenna and the second electro-optical conversion unit are connected in sequence via a cable or a microstrip line; ...; the Nth receiving antenna and the Nth electro-optical conversion unit are connected in sequence via a cable or a microstrip line; the first to Pth laser light sources, the first to Pth electro-optical conversion units, and the beam receiving delay network are connected in sequence via optical fibers or integrated optical waveguides;

[0014] The photonic arrival angle estimation unit estimates the arrival angles of the signals entering the P+1th, ..., Nth receiving antennas, and outputs control signals of the required delay change to the variable optical delay array A and the variable optical delay array B respectively.

[0015] The beam receiving delay network is composed of a splitter array, a variable optical delay array A, and a wavelength division multiplexing array. The splitter array is composed of a first 1×M optical splitter, a second 1×M optical splitter, ..., a P1×M optical splitter; the wavelength division multiplexing array is composed of a first wavelength division multiplexer, a second wavelength division multiplexer, ..., an Mth wavelength division multiplexer; the variable optical delay array A is composed of an optical delay matrix 1, an optical delay matrix 2, ..., an optical delay matrix P, and the delay amount of each delay unit in the optical delay matrix is ​​adjustable to realize the beam domain reception function for signals with different arrival angles. The splitter array, the variable optical delay array A, and the wavelength division multiplexing array are connected in sequence by optical fibers or integrated optical waveguides;

[0016] The first laser light source, the second laser light source, ..., and the Pth laser light source have different wavelengths of output light waves;

[0017] The convolution mixing-instantaneous mixing conversion module is composed of a variable optical delay array B, which is composed of a first single-channel adjustable optical delay unit Δt1, a second single-channel adjustable delay unit Δt2, ..., an Mth single-channel adjustable delay unit Δt M It realizes the function of converting the beam receiving signal from optical domain convolution mixing to instantaneous mixing.

[0018] The optical domain instantaneous hybrid blind source separation module is composed of an amplitude weighted array, a photoelectric receiving array, an M×1 electrical combiner, a 1×2 electrical splitter, and a signal acquisition and data processing unit.

[0019] The amplitude weighting array is composed of M dual-output light domain amplitude weighting units OW1, OW2, ..., OW MComposition: The intensity changes of the two output ports of the dual-output optical domain amplitude weighting unit satisfy a complementary relationship.

[0020] The photoelectric receiving array is composed of M balanced photoelectric detectors; the two optical input ports of the balanced photoelectric detectors are respectively connected to the two output ports of the dual-output optical domain amplitude weighting unit;

[0021] The M output ports of the optoelectronic receiving array are respectively connected to the M input ports of the M×1 electrical combiner; the output port of the M×1 electrical combiner is connected to the input port of the 1×2 electrical splitter; one output port of the 1×2 electrical splitter is connected to the signal sampling and data processing unit; and the other output port outputs the target signal of blind source separation and demixing.

[0022] The signal acquisition and data processing unit has the function of undersampling the received signal and running a feedback algorithm, and outputs a control signal to the amplitude weighted array.

[0023] The amplitude weighted array and the photoelectric receiving array are connected in sequence through optical fibers or waveguides; the photoelectric receiving array, the M×1 electrical combiner, the 1×2 electrical splitter, and the signal acquisition and data processing unit are connected in sequence through cables or microstrip lines.

[0024] The beam domain receiving photonics large bandwidth blind source separation method for main lobe interference is characterized by the following steps:

[0025] In the first step, multiple signal sources emit mixed signals which are transmitted in space. The mixed signal is received by the first receiving antenna and modulated onto the light wave emitted by the first laser light source via the first electro-optical conversion unit. The mixed signal is received by the second receiving antenna and modulated onto the light wave emitted by the second laser light source via the second electro-optical conversion unit. ... The mixed signal is received by the Pth receiving antenna and modulated onto the light wave emitted by the Pth laser light source via the Pth electro-optical conversion unit.

[0026] In the second step, the P+1th receiving antenna, ..., Nth receiving antenna receive the mixed signal transmitted from space and enter the photonic arrival angle estimation unit, and output the control signal of the required delay change amount according to the estimated arrival angle to the variable optical delay array A and the variable optical delay array B respectively.

[0027] In the third step, the optical microwave signal output by the electro-optical conversion unit is transmitted to the optical splitter of the optical splitter array in the beam receiving delay network; each optical splitter divides the optical microwave signal into M paths, and the M paths of optical microwave signals output by the first optical splitter are respectively transmitted to the first input port of each wavelength division multiplexer in the wavelength division multiplexing array via the optical delay matrix 1; the M paths of optical microwave signals output by the second optical splitter are respectively transmitted to the second input port of each wavelength division multiplexer in the wavelength division multiplexing array via the optical delay matrix 2; ...; the M paths of optical microwave signals output by the Mth optical splitter are respectively transmitted to the Mth input port of each wavelength division multiplexer in the wavelength division multiplexing array via the optical delay matrix P;

[0028] The fourth step is to control the delay of each multi-channel adjustable optical delay unit in the variable optical delay array A according to the arrival angle estimated by the photonic arrival angle estimation unit, so that different receiving beams are aligned with the arrival angle directions of different incident signals.

[0029] In the fifth step, the optically controlled multi-beam receiving module outputs the first beam, the second beam, ..., the Mth beam, which respectively enter the first adjustable delay unit Δt1, the second adjustable delay unit Δt2, ..., the Mth adjustable delay unit Δt M According to the arrival angle measured by the photonic arrival angle estimation unit, the delay amount Δt1, Δt2, ..., Δt of each single-channel adjustable optical delay unit in the variable optical delay array B is controlled. M , realize the delayed synchronization of different receiving beams and complete the conversion from convolution mixing to instantaneous mixing.

[0030] Step 6: The optical domain convolution mixing-instantaneous mixing conversion module outputs the delayed synchronized 1st beam, 2nd beam, ..., Mth beam, which enter the first amplitude weighting unit OW1, the second amplitude weighting unit OW2, ..., the Mth amplitude weighting unit OW1 of the optical domain amplitude weighting array respectively. M The optical powers of the two output ports of each amplitude weighting unit are adjustable, respectively realizing complementary weighting of the optically-carried microwave signal in the range of 0 to 1.

[0031] Step 7: The optical microwave signal output from the two ports of the first amplitude weighting unit OW1 of the optical domain amplitude weighting array enters the two input ports of the first balanced photodetector of the photoelectric conversion array; the optical microwave signal output from the two ports of the second amplitude weighting unit OW2 enters the two input ports of the second balanced photodetector of the photoelectric conversion array; ...; the Mth amplitude weighting unit OW M The optical microwave signals output from the two ports enter the two input ports of the Mth balanced photodetector of the photoelectric conversion array. Each balanced photodetector performs photoelectric detection on the two input optical microwave signals, converts them into photocurrents, and performs differential combined output, thereby expanding the amplitude weighted value range of the optical microwave signals to -1 to 1.

[0032] The M×1 electrical combiner combines the weighted microwave signals to achieve the function of adding the mixed signals in different weighted beams. The weighted combined signal output by the 1×2 electrical splitter enters the signal acquisition and data processing unit, which obtains the statistical information of the output signal, uses the statistical information as the objective function of the feedback algorithm to perform photon principal component analysis and photon independent component analysis, and performs matrix solution on the source signal. By changing the amplitude ratio of the two-port output of the amplitude weighting unit in the optical domain amplitude weighting array, the weight value of the instantaneous mixed signal can be adjusted.

[0033] The eighth step is to initialize the weight value added by the optical domain weighting unit to the instantaneous mixed signal, compare the signal statistical information obtained by the signal acquisition and data processing unit with the convergence condition of the feedback algorithm, adjust the weight value applied by the optical domain amplitude weighting unit to the mixed signal, iterate, achieve the convergence condition of the feedback algorithm, realize the separation of the blind source signal, and output the target signal.

[0034] The beneficial effects of the present invention are:

[0035] (1) Photonic methods are used for beam domain reception. By constructing beams with different directional directions to receive signals, the convolution mixing is further converted to instantaneous mixing through optical delay control, thus avoiding direct processing of multi-dimensional array element domain signals, achieving data dimensionality reduction, and effectively reducing the amount of calculation.

[0036] (2) The mixed signal in the beam is weighted and controlled by using optical domain amplitude weighting. The photon principal component analysis and independent component analysis are performed with the output signal statistical information as the objective function to separate the target signal and the interference signal in the main lobe. No prior information of the source signal is required. It has the advantages of large processing bandwidth, wide frequency band range and low power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural diagram of a blind source separation device for photonic beam domain reception targeting main lobe interference according to the present invention.

[0038] Figure 2 This is a structural diagram of a 10-element linear array photonics beam-domain receiving blind source separation device.

[0039] Figure 3 is the mixed signal constellation diagram received by beam 1.

[0040] Figure 4 It is the mixed signal constellation diagram received by beam 2.

[0041] Figure 5 It is the constellation diagram of the target signal after demodulation. DETAILED DESCRIPTION

[0042] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0043] The device for realizing the blind source separation function of photonic beam domain reception for main lobe interference comprises: an optical domain multi-beam receiving module, an optical domain convolution mixing-instantaneous mixing conversion module, and an optical domain instantaneous mixing blind source separation module.

[0044] Figure 2 The device structure diagram of the blind source separation function of the 10-element linear array photonic beam domain reception is given. The optical domain multi-beam receiving module includes: a first receiving antenna, a second receiving antenna, ..., a tenth receiving antenna, a first laser light source, a second laser light source, ..., a tenth laser light source (where the ninth laser light source and the tenth laser light source are located in the photonic arrival angle estimation unit), a first electro-optical conversion unit, a second electro-optical conversion unit, ..., a tenth electro-optical conversion unit (where the ninth electro-optical conversion unit and the tenth electro-optical conversion unit are located in the photonic arrival angle estimation unit), a photonic arrival angle estimation unit, and a beam reception delay network.

[0045] The optical domain convolution mixing-instantaneous mixing conversion module is composed of a variable optical delay array B, which is composed of a first single-channel adjustable optical delay unit Δt1 and a second single-channel adjustable delay unit Δt2. Each single-channel adjustable delay unit adjusts the transmission delay of beam 1 and beam 2 to match them, thereby realizing the function of converting optical domain convolution mixing to instantaneous mixing.

[0046] The optical domain instantaneous hybrid blind source separation module is composed of an amplitude weighted array, a photoelectric receiving array, a 2×1 electrical combiner, a 1×2 electrical splitter, and a signal acquisition and data processing unit.

[0047] The light domain amplitude weighting array is composed of two dual-output light domain amplitude weighting units (OW1 and OW2); the intensity changes of the two output ports of the dual-output light domain amplitude weighting unit satisfy a complementary relationship.

[0048] The photoelectric receiving array is composed of two balanced photoelectric detectors; the two output ports of the dual-output optical domain amplitude weighting unit are respectively connected to the two optical input ports of the balanced photoelectric detector; the balanced photoelectric detector outputs an electrical signal after performing photoelectric detection differential combination, and the relative amplitude variation range of the electrical signal is from -1 to +1;

[0049] The two output ports of the photoelectric receiving array are respectively connected to the two input ports of the 2×1 electrical combiner; the output port of the 2×1 electrical combiner is connected to the input port of the 1×2 electrical splitter; one output port of the 1×2 electrical splitter is connected to the signal sampling and data processing unit; and the other output port outputs the target signal of blind source separation and demixing.

[0050] Example

[0051] The carrier frequency of the target signal and the interference signal are both 3GHz, the bandwidth is 576MHz, the modulation format of the target signal is 16QAM, and the modulation format of the interference signal is 4QAM. The source signal composed of the target signal and the interference signal is mixed and transmitted to the receiving antenna through spatial transmission.

[0052] First, the photonic arrival angle estimation unit estimates the angle of the input signal. The mixed signal received by the ninth receiving antenna and the mixed signal received by the tenth receiving antenna are modulated by the ninth electro-optical conversion unit and the tenth electro-optical conversion unit to the optical carrier output by the ninth laser light source and the tenth laser light source, respectively. The optically-carried microwave signal is transmitted to the variable delay array 3, and the signal acquisition and processing unit 1 analyzes and obtains the arrival angles θ1 and θ2 of the signal entering the linear array through the delay search of the first variable delay unit (VODL1) and the second variable delay unit (VODL2) in the variable delay array 3.

[0053] The signal acquisition and processing unit 1 outputs a delay control signal for forming beam pointing angles θ1 and θ2 to the beam receiving delay network. The variable optical delay array A adjusts the delay of the delay unit in each optical delay matrix according to the delay control signal to form receiving beams with pointing angles θ1 and θ2, respectively, and receives the mixed signal transmitted from the spatial domain. The mixed signal constellation diagram received by beam 1 is shown in Figure 3 As shown, the mixed signal constellation diagram received by beam 2 is as follows Figure 4 As shown, it can be seen that the constellation diagrams of the signals received by the two beams are confused.

[0054] The signal acquisition and processing unit 1 outputs beam delay difference control signals with beam pointing angles of θ1 and θ2 to the variable optical delay array B. The variable optical delay array B adjusts the delay amount (Δt1 and Δt2) of each single-channel adjustable delay unit according to the delay difference control signal to realize the delay synchronization function of different receiving beams. At this time, the same signal has only amplitude difference but no delay difference in different beams, completing the conversion from convolution mixing to instantaneous mixing. The signal output by the optical domain convolution mixing-instantaneous mixing conversion module is transmitted to the optical domain instantaneous mixing blind source separation module.

[0055] The signal acquisition and data processing unit 2 in the optical domain instantaneous mixed blind source separation module uses the statistical information of the signal as the objective function of the feedback algorithm to perform photon principal component analysis and photon independent component analysis, solve the matrix of the mixed signal, and realize the weighted value regulation by changing the ratio of the output of the two ports of the amplitude weighting unit (OW1 and OW2). When the algorithm converges, the signal output by the optical domain instantaneous mixed blind source separation module is the source signal. Figure 5The constellation diagram of the target signal (16QAM) after blind source separation is given, and the vector magnitude error value (EVM) of the signal is 8.26%, which meets the standard requirements of wireless communication and completes the function of blind source separation signal extraction.

[0056] The above-described embodiments merely express the implementation methods of the present invention, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A blind source separation device for photonic beam domain reception against main lobe interference, characterized in that: include: Optical domain multi-beam receiving module, optical domain convolution mixing-instantaneous mixing conversion module, optical domain instantaneous mixing blind source separation module; The optical domain multi-beam receiving module includes: a first receiving antenna, a second receiving antenna, ..., a Pth receiving antenna, a P+1th receiving antenna, ..., an Nth receiving antenna, a first laser light source, a second laser light source, ..., a Pth laser light source, a first electro-optical conversion unit, a second electro-optical conversion unit, ..., a Pth electro-optical conversion unit, a photonic arrival angle estimation unit, and a beam receiving delay network; the first receiving antenna and the first electro-optical conversion unit are connected in sequence through a cable or a microstrip line; the second receiving antenna and the second electro-optical conversion unit are connected in sequence through a cable or a microstrip line; ...; the Nth receiving antenna and the Nth electro-optical conversion unit are connected in sequence through a cable or a microstrip line; the first to Pth laser light sources, the first to Pth electro-optical conversion units, and the beam receiving delay network are connected in sequence through optical fibers or integrated optical waveguides; The photonic arrival angle estimation unit estimates the arrival angles of the signals entering the P+1th receiving antenna, ..., the Nth receiving antenna, and outputs control signals of the required delay change amount to the variable optical delay array A and the variable optical delay array B respectively; The beam receiving delay network is composed of a splitter array, a variable optical delay array A, and a wavelength division multiplexing array; the splitter array is composed of a first 1×M optical splitter, a second 1×M optical splitter, ..., and a Pth 1×M optical splitter; the wavelength division multiplexing array is composed of a first wavelength division multiplexer, a second wavelength division multiplexer, ..., and an Mth wavelength division multiplexer; the variable optical delay array A is composed of an optical delay matrix 1, an optical delay matrix 2, ..., and an optical delay matrix P, and the delay amount of each delay unit in the optical delay matrix is ​​adjustable to realize the beam domain receiving function of signals with different arrival angles; the splitter array, the variable optical delay array A, and the wavelength division multiplexing array are sequentially connected by optical fibers or integrated optical waveguides; The first laser light source, the second laser light source, ..., and the Pth laser light source have different wavelengths of output light waves; The convolution mixing-instantaneous mixing conversion module is composed of a variable optical delay array B, which is composed of a first single-channel adjustable optical delay unit Δt1, a second single-channel adjustable delay unit Δt2, ..., an Mth single-channel adjustable delay unit Δt M Composition, realizing the function of transforming the beam receiving signal from optical domain convolution mixing to instantaneous mixing; The optical domain instantaneous hybrid blind source separation module is composed of an amplitude weighted array, a photoelectric receiving array, an M×1 electrical combiner, a 1×2 electrical splitter, and a signal acquisition and data processing unit; The amplitude weighted array is composed of M dual-output light domain amplitude weighted units OW1, OW2, ..., OW M Composition: The intensity changes of the two output ports of the dual-output optical domain amplitude weighting unit satisfy a complementary relationship; The photoelectric receiving array is composed of M balanced photoelectric detectors; the two optical input ports of the balanced photoelectric detectors are respectively connected to the two output ports of the dual-output optical domain amplitude weighting unit; The M output ports of the photoelectric receiving array are respectively connected to the M input ports of the M×1 electrical combiner; the output port of the M×1 electrical combiner is connected to the input port of the 1×2 electrical splitter; one output port of the 1×2 electrical splitter is connected to the signal sampling and data processing unit; the other output port outputs the target signal of blind source separation and demixing; The signal acquisition and data processing unit has the function of undersampling the received signal and running a feedback algorithm, and outputting a control signal to the amplitude weighted array; The amplitude weighted array and the photoelectric receiving array are connected in sequence through optical fibers or waveguides; the photoelectric receiving array, the M×1 electrical combiner, the 1×2 electrical splitter, and the signal acquisition and data processing unit are connected in sequence through cables or microstrip lines.

2. The method for photonics beam domain reception blind source separation of the device for photonics beam domain reception blind source separation of claim 1 is characterized in that Here are the steps: In the first step, multiple signal sources transmit in space to form a mixed signal, the mixed signal is received by the first receiving antenna and modulated by the first electro-optical conversion unit onto the light wave emitted by the first laser light source; the mixed signal is received by the second receiving antenna and modulated by the second electro-optical conversion unit onto the light wave emitted by the second laser light source; ...; the mixed signal is received by the Pth receiving antenna and modulated by the Pth electro-optical conversion unit onto the light wave emitted by the Pth laser light source; In the second step, the mixed signal transmitted from the space is received by the P+1th receiving antenna, ..., and the Nth receiving antenna and enters the photonic arrival angle estimation unit, and the control signal of the required delay change amount is output according to the estimated arrival angle to the variable optical delay array A and the variable optical delay array B respectively; In the third step, the optical microwave signal output by the electro-optical conversion unit is transmitted to the optical splitter of the optical splitter array in the beam receiving delay network; each optical splitter divides the optical microwave signal into M paths, and the M paths of optical microwave signals output by the first optical splitter are respectively transmitted to the first input port of each wavelength division multiplexer in the wavelength division multiplexing array via the optical delay matrix 1; the M paths of optical microwave signals output by the second optical splitter are respectively transmitted to the second input port of each wavelength division multiplexer in the wavelength division multiplexing array via the optical delay matrix 2; ...; the M paths of optical microwave signals output by the Mth optical splitter are respectively transmitted to the Mth input port of each wavelength division multiplexer in the wavelength division multiplexing array via the optical delay matrix P; The fourth step is to control the delay of each multi-channel adjustable optical delay unit in the variable optical delay array A according to the arrival angle estimated by the photonic arrival angle estimation unit, so that different receiving beams are aligned with the arrival angle directions of different incident signals; In the fifth step, the optically controlled multi-beam receiving module outputs the first beam, the second beam, ..., the Mth beam, which respectively enter the first adjustable delay unit Δt1, the second adjustable delay unit Δt2, ..., the Mth adjustable delay unit Δt M According to the arrival angle measured by the photonic arrival angle estimation unit, the delay amount Δt1, Δt2, ..., Δt of each single-channel adjustable optical delay unit in the variable optical delay array B is controlled. M , realize the delayed synchronization of different receiving beams and complete the conversion from convolution mixing to instantaneous mixing; Step 6: The optical domain convolution mixing-instantaneous mixing conversion module outputs the delayed synchronized 1st beam, 2nd beam, ..., Mth beam, which enter the first amplitude weighting unit OW1, the second amplitude weighting unit OW2, ..., the Mth amplitude weighting unit OW1 of the optical domain amplitude weighting array respectively. M The optical power of the two output ports of each amplitude weighting unit is adjustable, respectively realizing complementary weighting of the optically-carried microwave signal in the range of 0 to 1; Step 7: The optical microwave signal output from the two ports of the first amplitude weighting unit OW1 of the optical domain amplitude weighting array enters the two input ports of the first balanced photodetector of the photoelectric conversion array; the optical microwave signal output from the two ports of the second amplitude weighting unit OW2 enters the two input ports of the second balanced photodetector of the photoelectric conversion array; ...; the Mth amplitude weighting unit OW M The optical microwave signals output from the two ports enter the two input ports of the Mth balanced photodetector of the photoelectric conversion array; each balanced photodetector performs photoelectric detection on the two input optical microwave signals, converts them into photocurrents, and performs differential combined output, thereby expanding the amplitude weighted value range of the optical microwave signals to -1 to 1; The M×1 electrical combiner combines the weighted microwave signals to achieve the addition function of the mixed signals in different weighted beams; the weighted combined signal output by the 1×2 electrical splitter enters the signal acquisition and data processing unit, which obtains the statistical information of the output signal, uses the statistical information as the objective function of the feedback algorithm to perform photon principal component analysis and photon independent component analysis, performs matrix solution on the source signal, and realizes the regulation of the instantaneous mixed signal weight value by changing the amplitude ratio of the two-port output of the amplitude weighting unit in the optical domain amplitude weighting array; The eighth step is to initialize the weight value added by the optical domain weighting unit to the instantaneous mixed signal, compare the signal statistical information obtained by the signal acquisition and data processing unit with the convergence condition of the feedback algorithm, adjust the weight value applied by the optical domain amplitude weighting unit to the mixed signal, iterate, achieve the convergence condition of the feedback algorithm, realize the separation of the blind source signal, and output the target signal.

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