A method and system for realizing simultaneous imaging and detection based on coded array

Abstract

The present invention relates to a method and system for realizing simultaneous imaging and detection based on a coded array; wherein the method comprises: assigning a separate coded pulse signal to each radiating element of a radar array; the separate coded pulse signal enables the echo signal generated by the target reflection to be separable in time, space or frequency; or the echo signal can be separated after being decoded; when the radar is working, each radiating element of the radar array transmits its own coded pulse signal, and each radiating element receives the echo signal of the coded pulse signal transmitted by itself and other radiating elements; the echo signal received by each radiating element is collected and decoded; according to the decoded echo signal, imaging processing and signal detection processing are performed, and radar images and moving target detection results are obtained at the same time. The present invention improves the system performance of simultaneous imaging and detection of the radar, and can flexibly adjust the imaging performance and moving target detection performance.

Description

Technical Field

[0001] The present invention belongs to the field of radar technology, and in particular relates to a method and system for realizing simultaneous imaging and detection based on a coded array. Background Art

[0002] Radar is a radio remote sensing detection device that obtains target information by emitting detection signals and receiving reflected signals from the target. It can detect both stationary and moving targets, and can achieve high-resolution radar imaging and obtain target image information through aperture synthesis technology.

[0003] In the existing technology, synthetic aperture radar or inverse synthetic aperture radar is usually used to achieve high-resolution imaging of the target. These two radars use pulse compression technology to improve range resolution and use synthetic aperture or inverse synthetic aperture technology to improve azimuth resolution.

[0004] In the existing technology, pulse Doppler radar or MTI radar is used to detect moving targets. The speed difference between the moving target and background clutter is utilized to suppress background clutter through Doppler filtering technology, thereby improving the detection performance of the moving target.

[0005] In existing technologies, imaging and detection can also be achieved simultaneously. By integrating synthetic aperture radar and MTI radar, it is possible to simultaneously image stationary targets and detect moving targets. Figure 1 However, when integrating the two radar systems simultaneously, it is difficult to simultaneously address the design requirements of both systems. Synthetic aperture radar and MTI radar have different requirements for signal waveform, signal bandwidth, signal accumulation method, and signal accumulation time. When the two technologies are implemented simultaneously in a single radar, these parameters usually need to be compromised, resulting in reduced imaging or detection performance, such as spatial resolution, temporal resolution, and detection range.

[0006] Therefore, there is a need in the art for a radar operating method and system that can overcome the high performance of traditional imaging radar and pulse Doppler radar or MTI radar at the same time and can flexibly configure imaging and detection performance according to needs. Summary of the Invention

[0007] In view of the above analysis, the present invention aims to disclose a method and system for achieving simultaneous imaging and detection based on a coded array, overcoming the shortcomings of traditional imaging radars and moving target detection radars, and meeting the requirements for improving the system performance of simultaneous radar imaging and detection.

[0008] The present invention discloses a method for realizing simultaneous imaging and detection based on a coding array, comprising the following steps:

[0009] Assigning a separate coded pulse signal to each radiating element of the radar array; the separate coded pulse signal enables the echo signal generated by the target reflection to be separated in time, space or frequency; or the echo signal can be separated after decoding processing;

[0010] When the radar is working, each radiating element of the radar array transmits its own coded pulse signal, and each radiating element receives the echo signal of the coded pulse signal transmitted by itself and other radiating elements;

[0011] The echo signal received by each radiation array element is collected and decoded; imaging processing and signal detection processing are performed based on the decoded echo signal, and radar images and moving target detection results are obtained at the same time.

[0012] Furthermore, the separate coded pulse signal is a frequency-divided coded pulse signal, a time-phase combined coded pulse signal, or a time-phase-frequency combined coded pulse signal.

[0013] Furthermore, the separate coded pulse signal is a frequency-divided coded pulse signal; when transmitting, each array element transmits at a different frequency, isolating the transmission channel by frequency; when receiving, after each array element receives the echo signal, the echo signal corresponding to the transmission signal of the different array elements is separated by frequency domain filtering;

[0014] The separate coded pulse signal is a time-phase combined coded pulse signal, and the basic constraint of coding is that the coding channels are orthogonal to each other; during transmission, each array element transmits using a different code; during reception, after each array element receives the echo signal, it separates the echo signals corresponding to the transmitted signals of different array elements through decoding processing;

[0015] The separate coded pulse signal is a time-phase-frequency combined coded pulse signal, and the basic constraint of the coding is that the coding channels are orthogonal to each other; during transmission, each array element uses different coding for transmission; during reception, after each array element receives the echo signal, the echo signals corresponding to the transmission signals of different array elements are separated through decoding processing.

[0016] Furthermore, the collecting the echo signal received by each radiating array element and performing decoding processing includes:

[0017] For frequency-division coded pulse signals, frequency domain filtering is used for decoding;

[0018] For a time-phase combined coded pulse signal, a decoding matrix is ​​obtained through the encoding matrix, and then the echo signal is decoded using the decoding matrix; the decoding matrix corresponds to the encoding matrix and includes a pulse decoding method corresponding to the pulse encoding method of all array elements;

[0019] For time-phase-frequency combined coded pulse signals, a decoding matrix is ​​obtained through the encoding matrix, and then the decoding matrix is ​​used to process the echo signal; the echo signal is then decoded and processed in combination with frequency filtering; the decoding matrix corresponds to the encoding matrix and includes a pulse decoding method corresponding to the pulse encoding method of all array elements.

[0020] Furthermore, in simultaneous imaging and detection,

[0021] The imaging processing utilizes the phase difference between the target echo signals of the non-simultaneous coded pulses of each array element and the phase difference between the target echo signals of the simultaneous coded pulses of each array element to perform imaging processing to obtain a radar image;

[0022] The detection processing includes jointly performing target detection processing on the target echo signals of the array elements with different simultaneous coded pulses, or performing target detection processing on the target echo signals of the array elements with simultaneous coded pulses separately.

[0023] Furthermore, in the imaging process,

[0024] For the decoded N 2 The target echo data of the independent channel signal is selected for subsequent processing according to the imaging resolution, where N is the number of array elements; including:

[0025] 1) Frequency processing:

[0026] For the echo signal of frequency division coding, after filtering the received data, frequency synthesis is performed, and the frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the imaging resolution requirement;

[0027] For the echo signal of time-phase combination encoding, after filtering and decoding the received data, frequency synthesis is performed, and the frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the imaging resolution requirement;

[0028] For the echo signal encoded by time-phase-frequency combination, frequency synthesis is performed after filtering and decoding the received data. The frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the imaging resolution requirement.

[0029] 2) Array element processing:

[0030] According to the imaging resolution requirement, the number of array elements participating in the imaging process is selected, and the echo signals of the selected array elements are phase-shifted and accumulated to obtain a composite signal; the length of the composite antenna corresponding to the number of array elements is not greater than the antenna length corresponding to the imaging resolution requirement, and the echo signals of the selected array elements are phase-shifted and accumulated to obtain a composite signal;

[0031] 3) Imaging processing:

[0032] According to the strip imaging mode or the spotlight imaging mode, imaging processing is performed on the synthetic signal obtained by the array processing.

[0033] Furthermore, in the signal detection process,

[0034] For the decoded N 2 The target echo data of the independent channel signals are selected to perform frequency processing and frequency synthesis based on the resolution required for signal detection, so as to obtain a frequency bandwidth not less than the frequency bandwidth corresponding to the resolution required for signal detection; N is the number of array elements;

[0035] In the direction of radar flight, all the radar array elements are divided into two or three sub-arrays. The echo signals of the elements in each sub-array are phase-shifted and accumulated to obtain a composite signal. The phase of each element's phase shift does not change with the radar's position.

[0036] For the segmentation of two sub-arrays, the DPCA method is used for moving target detection;

[0037] For the segmentation of three sub-arrays, the ATI method is used for moving target detection.

[0038] Furthermore, in the signal detection process,

[0039] For the decoded N 2 The target echo data of the independent channel signals are selected to perform frequency processing and frequency synthesis based on the resolution required for signal detection, so as to obtain a frequency bandwidth not less than the frequency bandwidth corresponding to the resolution required for signal detection; N is the number of array elements;

[0040] The echo signals of all array elements are phase-shifted and accumulated. According to the detection direction, the phase of each array element changes with the radar detection direction;

[0041] Through parallel processing, the echo signals of all array elements are phase-shifted and accumulated for D detection directions at the same time, thereby obtaining high signal gain in D detection directions;

[0042] described φ is the detection angle range, θ is the spatial angular width of the high signal gain obtained;

[0043] The detection signals obtained by multiple detection array element processing are transformed and detected to detect the moving target.

[0044] The present invention also discloses a system for implementing a simultaneous imaging and detection method based on the coding array as described above, comprising:

[0045] An array coded signal generating unit, configured to generate a separate pulse coded signal for transmission by each radiating array element; the separate coded pulse signal enables the echo signals generated by target reflection to be separated in time, space or frequency; or the echo signals can be separated after decoding;

[0046] A radar array includes N array elements, each of which transmits a pulse coded signal and receives target echo signals from all array elements transmitting the pulse coded signal;

[0047] A data acquisition unit is used to collect the target echo signal received by each radiation array element to form target echo data;

[0048] The array signal decoding and processing unit is used to decode the collected target echo data and separate the N corresponding to the transmit and receive channel combination formed by different radiation array elements. 2 Target echo data of independent channel signals;

[0049] An imaging processor is used to perform imaging processing on the target echo data corresponding to different transceiver channel combinations to obtain a radar image;

[0050] The target detection processor is used to perform target detection processing on the target echo data corresponding to different transceiver channel combinations to achieve target detection.

[0051] Furthermore, it also includes an integrated display unit for visualizing the radar image data and the detected target data to form a video stream containing the radar image and the radar target and its information;

[0052] The control unit is used to control the coding array to realize the signal generation, transmission and reception, acquisition, processing and display data generation of the simultaneous imaging and detection system.

[0053] The present invention can achieve at least one of the following beneficial effects:

[0054] (1) The present invention improves the system performance of radar imaging and detection. Array pulse coding is used to achieve flexible coverage of the detection space while simultaneously addressing the radar waveform and parameter requirements for both imaging and moving target detection, achieving both high-performance imaging and high-performance moving target detection.

[0055] (2) The imaging method and detection method can be flexibly configured according to the selection of different array pulse encoding and decoding methods, and the imaging performance and moving target detection performance can be flexibly adjusted. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0057] Figure 1 A schematic diagram of the working mode of synthetic aperture radar imaging and MTI detection according to the prior art;

[0058] Figure 2 Schematic diagram of a method for achieving simultaneous imaging and detection based on a coded array in an embodiment of the present invention;

[0059] Figure 3 FIG. 4 is a schematic diagram of a radar system for simultaneous imaging and detection according to an embodiment of the present invention. DETAILED DESCRIPTION

[0060] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which constitute a part of this application and are used to illustrate the principles of the present invention together with the embodiments of the present invention.

[0061] One embodiment of the present invention discloses a method for achieving simultaneous imaging and detection based on a coded array. Figure 2 As shown, the following steps are included:

[0062] Step S1: assigning a separate coded pulse signal to each radiating element of the radar array;

[0063] The separate coded pulse signal enables the echo signal generated by the target reflection to be separable in time, space or frequency; or the echo signal is separable after being decoded.

[0064] Preferably, the separate coded pulse signal is a frequency-divided coded pulse signal. During transmission, each array element transmits at a different frequency, and the transmission channel is isolated by frequency. During reception, after each array element receives the echo signal, the echo signal corresponding to the transmission signal of the different array elements is separated by frequency domain filtering.

[0065] Preferably, the separate coded pulse signal is a time-phase combined coded pulse signal, and the basic constraint of the coding is that the coding channels are orthogonal to each other. During transmission, each array element transmits using a different coding, and during reception, after receiving the echo signal, each array element separates the echo signals corresponding to the transmitted signals of different array elements through decoding processing;

[0066] Preferably, the separate coded pulse signal is a time-phase-frequency combined coded pulse signal. The basic constraint of the coding is that the coding channels are orthogonal to each other, and each array element uses a different coding for transmission. During reception, after each array element receives the echo signal, it separates the echo signals corresponding to the transmission signals of different array elements through decoding processing.

[0067] Step S2: When the radar is working, each radiating element of the radar array transmits its own coded pulse signal;

[0068] Specifically, each radiating element of the radar array is assigned a separate coded pulse signal, so that each radiating element of the radar array transmits its own coded pulse signal.

[0069] Step S3: The radar array receives the echo signal of the coded pulse;

[0070] Each radiating array element receives the echo signal of its own transmitted coded pulse signal and the echo signal of the coded pulse signal transmitted by other radiating array elements; and solves the problem of interference of transmitted signals between channels through frequency isolation or codec isolation.

[0071] Step S4: collecting the echo signal received by each radiating array element and decoding the echo signal;

[0072] For frequency-division coded pulse signals, frequency domain filtering is used for decoding;

[0073] For the time-phase combined coded pulse signal, the decoding matrix is ​​obtained through the encoding matrix, and then the decoding matrix is ​​used to process the echo signal to complete the decoding process;

[0074] For the time-phase-frequency combined coded pulse signal, the decoding matrix is ​​obtained through the encoding matrix, and then the decoding matrix is ​​used to process the echo signal, and combined with the frequency filtering method to complete the decoding process.

[0075] Step S5: Perform imaging processing and signal detection processing simultaneously based on the decoded echo signal to obtain a radar image and a moving target detection result;

[0076] By selecting different array pulse encoding and decoding methods, the imaging method and detection method can be flexibly configured, the imaging performance and moving target detection performance can be flexibly adjusted, and flexible coverage of the detection space can be achieved.

[0077] Specifically, the imaging processing method includes:

[0078] The radar image is obtained by performing imaging processing using the phase difference between the target echo signals of the different encoding pulses of each array element and the phase difference between the target echo signals of the simultaneous encoding pulses of each array element.

[0079] For decoded echo data, including N 2 The data of the signals of independent channels (N is the number of array elements) are selected according to the imaging resolution to perform subsequent processing:

[0080] 1) Frequency processing:

[0081] For the echo signal of frequency division coding, after filtering the received data, frequency synthesis is performed, and the frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the imaging resolution requirement;

[0082] For the echo signal of time-phase combination encoding, after filtering and decoding the received data, frequency synthesis is performed, and the frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the imaging resolution requirement;

[0083] For the echo signal encoded by time-phase-frequency combination, frequency synthesis is performed after filtering and decoding the received data. The frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the imaging resolution requirement.

[0084] 2) Array element processing:

[0085] In addition, the number of array elements involved in the imaging process must be selected based on the imaging resolution requirements. The length of the synthetic antenna corresponding to the number of array elements must not exceed the length of the antenna corresponding to the imaging resolution requirements. The echo signals of the selected array elements are phase-shifted and accumulated to obtain a synthetic signal.

[0086] According to different SAR imaging modes, the phase of each array element phase shift is determined. For the strip imaging mode, the phase of each array element phase shift does not change with the position of the radar movement. For the spotlight imaging mode, the phase of each array element phase shift changes with the position of the radar movement.

[0087] 3) Imaging processing:

[0088] According to the imaging mode, imaging processing is performed on the synthetic signal obtained by the array processing.

[0089] Specifically, the signal detection and processing method includes:

[0090] The signal detection processing performed on the echo signal received by each array element may be a joint target detection processing performed on the target echo signals of the array element's non-simultaneous coded pulses; or a separate target detection processing may be performed on the target echo signals of the array element's simultaneous coded pulses to achieve target detection.

[0091] For decoded echo data, including N 2 The data of the signals of the independent channels (N is the number of array elements) are selected for subsequent processing according to the resolution required for signal detection:

[0092] 1) Frequency processing:

[0093] For the echo signal of frequency division coding, after filtering the received data, frequency synthesis is performed, and the frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the resolution requirement required for signal detection;

[0094] For the echo signal encoded by time-phase-frequency combination, after filtering and decoding the received data, frequency synthesis is performed, and the frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the resolution requirement required for signal detection.

[0095] 2) After frequency processing, there are two processing methods:

[0096] (1) Solution 1:

[0097] Array processing:

[0098] All the radar array elements are divided into two or three sub-arrays in the direction of radar flight. The echo signals of the elements of each sub-array are phase-shifted and accumulated to obtain a composite signal. The phase of each element's phase shift does not change with the position of the radar movement.

[0099] Detection and processing:

[0100] For the segmentation of two sub-arrays, the DPCA method is used for moving target detection;

[0101] For the segmentation of the three sub-arrays, the ATI method is used for moving target detection processing;

[0102] (2) Solution 2:

[0103] Array processing:

[0104] Utilizing all the radar array elements, the echo signals of all the array elements are phase-shifted and accumulated. According to the detection direction, the phase of each array element changes with the radar detection direction. Through the above phase-shifting radar, high signal gain in a specific direction is obtained, thus achieving high signal gain in a specific detection direction;

[0105] Through parallel processing, the echo signals of all array elements are phase-shifted and accumulated in D detection directions at the same time, and high signal gain in D detection directions is obtained at the same time, thereby achieving high-gain detection coverage in a specific direction and range;

[0106] The choice of D is related to the spatial angular width θ of the high signal gain and the detection angle range φ. That is, the range of high gain coverage in D different directions obtained after array element processing is not less than the detection angle range;

[0107] Detection and processing:

[0108] The detection signal transformation detection processing obtained by multiple detection array element processing detects the moving target through the angle change of the moving target in multiple detections, that is, the moving target appears in the data corresponding to different detection directions.

[0109] Before detection processing, the detection signals obtained by processing multiple adjacent detection array elements can be accumulated first, and then the difference processing of the accumulated different radar detection signals can be performed to detect the moving target.

[0110] The above-mentioned transformation detection process may adopt coherent change detection or incoherent change detection.

[0111] Step S6: performing comprehensive display processing on the radar image and target detection results;

[0112] Step S7: Display the integrated display-processed radar image and moving target information on a display device.

[0113] Another embodiment of the present invention discloses a system for achieving simultaneous imaging and detection using a coded array. Figure 3 Shown, including:

[0114] An array coding signal generating unit, configured to generate a separate pulse coding signal transmitted by each radiating array element;

[0115] The individual coded signals are separable from the echo signals generated by the coded signals at the target in time, space, or frequency, or by a decoding process.

[0116] A radar array includes N array elements, each of which transmits a pulse-coded signal and receives target echo signals from all array elements. Each array element also includes a transmitter, a receiver, and a circulator. The circulator is connected to the transmitter, the receiver, and the array element, respectively, and is used to transmit the radiation signal output by the transmitter to the array element for radiation, or output the target echo signal received by the array element to the receiver for reception and processing. The circulator also achieves transmit-receive isolation for the radar.

[0117] Each element of the radar array should have the ability to transmit an independent coded signal when transmitting, and should have the ability to independently receive the echo signal when receiving.

[0118] Connected to the transmitter of each array element is a separate pulse coded signal corresponding to the array element generated by the array coded signal generating unit;

[0119] Connected to the receiver output of each array element is a data acquisition unit;

[0120] a data acquisition unit configured to acquire a target echo signal received by each radiation array element to form target echo data;

[0121] The data acquisition unit may acquire the echo signal of each array element separately, or mix the echo signals of N array elements (N>1) and then acquire the mixed signal.

[0122] The array signal decoding and processing unit is configured to decode the collected target echo data and separate the target echo data corresponding to the transmit and receive channel combination formed by different radiating array elements;

[0123] For frequency division coding, the echo data corresponding to the echo signal received by each array element is subjected to frequency domain filtering by a filter group corresponding to the number of array elements. Each filter outputs an echo signal corresponding to the frequency of the transmitting array element.

[0124] For time-phase combined encoding, the echo data corresponding to the echo signal received by each array element is calculated with the decoding matrix to obtain an output decoding signal corresponding to the number of array elements.

[0125] For time-phase-frequency combined encoding, the echo data corresponding to the echo signal received by each array element is calculated with the decoding matrix and subjected to frequency domain filtering to obtain the output decoded signal corresponding to the number of array elements.

[0126] An imaging processor is configured to perform imaging processing on target echo data corresponding to different transceiver channel combinations to obtain a radar image;

[0127] The target detection processor is configured to perform target detection processing on target echo data corresponding to different transceiver channel combinations to achieve target detection;

[0128] an integrated display unit configured to perform visual processing on the radar image data and the detected target data to form a video stream containing the radar image and the radar target and its information;

[0129] The control unit is configured to control the encoding array to realize signal generation, transmission and reception, acquisition, processing and display data generation of the simultaneous imaging and detection system.

[0130] The control unit generates system operation synchronization signals, including signal generation synchronization signals, signal acquisition synchronization signals, and transceiver protection synchronization signals. Each array element has independent signal generation synchronization signals, signal acquisition synchronization signals, and transceiver protection synchronization signals. The signal generation synchronization signals and signal acquisition synchronization signals corresponding to each array element must maintain a strict synchronization relationship, and the synchronization requirements must be no less than the time synchronization requirements for SAR imaging.

[0131] It should be noted that, to facilitate understanding of the embodiments of the present invention, the above description omits certain more specific technical details that are well known to those skilled in the art and may be necessary for implementing the embodiments of the present invention. For example, the above description omits a general description of existing radars or radar systems. It should be understood that the continuous pulse radar according to the embodiments of the present invention may also include other components or assemblies of existing radars or radar systems in addition to the transmitter, receiver, and signal restorer described above. The above description is merely illustrative and not restrictive.

[0132] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A method for simultaneous imaging and detection based on a coded array, characterized in that: The following steps are involved: Assigning a separate coded pulse signal to each radiating element of the radar array; the separate coded pulse signal enables the echo signal generated by the target reflection to be separated in time, space or frequency; or the echo signal can be separated after decoding processing; When the radar is working, each radiating element of the radar array transmits its own coded pulse signal, and each radiating element receives the echo signal of the coded pulse signal transmitted by itself and other radiating elements; Collecting the echo signal received by each radiation array element and performing decoding processing; According to the decoded echo signal, imaging processing and signal detection processing are performed to obtain radar images and moving target detection results at the same time; The separate coded pulse signal is a frequency-divided coded pulse signal, a time-phase combined coded pulse signal or a time-phase-frequency combined coded pulse signal; The imaging processing uses the phase difference between the target echo signals of the non-simultaneous coded pulses of each array element and the phase difference between the target echo signals of the simultaneous coded pulses of each array element to perform imaging processing to obtain a radar image; The detection processing includes jointly performing target detection processing on the target echo signals of the array elements' non-simultaneous coded pulses, or individually performing target detection processing on the target echo signals of the array elements' simultaneous coded pulses; In the imaging process, For the decoded N 2 The target echo data of independent channel signals are selected for subsequent processing according to the imaging resolution, where N is the number of array elements; including: 1) Frequency processing: For the echo signal of frequency division coding, after filtering the received data, frequency synthesis is performed, and the frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the imaging resolution requirement; For the echo signal of time-phase combination encoding, after filtering and decoding the received data, frequency synthesis is performed, and the frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the imaging resolution requirement; For the echo signal encoded by time-phase-frequency combination, after filtering and decoding the received data, frequency synthesis is performed, and the frequency bandwidth after synthesis is not less than the frequency bandwidth corresponding to the imaging resolution requirement; 2) Array element processing: According to the imaging resolution requirement, the number of array elements participating in the imaging processing is selected, and the echo signals of the selected array elements are phase-shifted and accumulated to obtain a synthetic signal; the synthetic antenna length corresponding to the number of array elements is not greater than the antenna length corresponding to the imaging resolution requirement, and the echo signals of the selected array elements are phase-shifted and accumulated to obtain a synthetic signal; 3) Imaging processing: Performing imaging processing on the synthetic signal obtained by the array processing according to the strip imaging mode or the spotlight imaging mode; For the decoded N 2 The target echo data of the independent channel signals are selected to perform frequency processing and frequency synthesis according to the resolution required for signal detection, so as to obtain a frequency bandwidth not less than the frequency bandwidth corresponding to the resolution required for signal detection; N is the number of array elements; In the direction of radar flight, all array elements of the radar are divided into 2 or 3 sub-arrays, and the echo signals of the array elements of each sub-array are phase-shifted and accumulated to obtain a synthetic signal; wherein the phase of each array element phase shift does not change with the position of the radar movement; For the segmentation of two sub-arrays, the DPCA method is used for moving target detection processing; For the segmentation of the three sub-arrays, the ATI method is used for moving target detection.

2. The method according to claim 1, characterized in that The separate coded pulse signal is a frequency-divided coded pulse signal; when transmitting, each array element transmits at a different frequency, and the transmission channel is isolated by frequency; when receiving, after each array element receives the echo signal, the echo signal corresponding to the transmission signal of different array elements is separated by frequency domain filtering; The separate coded pulse signal is a time-phase combined coded pulse signal, and the basic constraint of coding is that the coding channels are orthogonal to each other; when transmitting, each array element uses different coding for transmission; when receiving, after each array element receives the echo signal, the echo signal corresponding to the transmission signal of different array elements is separated through decoding processing; The separate coded pulse signal is a time-phase-frequency combined coded pulse signal, and the basic constraint of coding is that the coding channels are orthogonal to each other; when transmitting, each array element uses different coding for transmission; when receiving, after each array element receives the echo signal, the echo signals corresponding to the transmission signals of different array elements are separated through decoding processing.

3. The method according to claim 2, characterized in that The collecting the echo signal received by each radiation array element and performing decoding processing includes: For the frequency-division coded pulse signal, the decoding process is performed by frequency domain filtering; For the time-phase combined coded pulse signal, a decoding matrix is ​​obtained through the coding matrix, and then the echo signal is decoded using the decoding matrix; the decoding matrix corresponds to the coding matrix, including a pulse decoding mode corresponding to the pulse coding mode of all array elements; For the time-phase-frequency combined coded pulse signal, the decoding matrix is ​​obtained through the coding matrix, and then the decoding matrix is ​​used to process the echo signal; the echo signal is then decoded and processed in combination with the frequency filtering method; the decoding matrix corresponds to the coding matrix, including the pulse decoding method corresponding to the pulse coding method of all array elements.

4. The method according to claim 1, characterized in that In the signal detection process, For the decoded N 2 The target echo data of the independent channel signals are selected to perform frequency processing and frequency synthesis according to the resolution required for signal detection, so as to obtain a frequency bandwidth not less than the frequency bandwidth corresponding to the resolution required for signal detection; N is the number of array elements; The echo signals of all array elements are phase-shifted and accumulated. According to the detection direction, the phase of each array element changes with the radar detection direction. Through parallel processing, phase shift accumulation is performed on the echo signals of all array elements in D detection directions at the same time, and high signal gain in D detection directions is obtained at the same time; Said φ is the detection angle range, θ is the spatial angular width of the high signal gain obtained; The detection signals obtained by multiple detection array element processing are transformed and detected to detect the moving target.

5. A system for implementing a simultaneous imaging and detection method based on the coding array according to any one of claims 1 to 4, characterized in that: include: An array coding signal generating unit, used for generating a separate pulse coding signal emitted by each radiating array element; The separate coded pulse signal enables the echo signal generated by the target reflection to be separated in time, space or frequency; or the echo signal can be separated after decoding processing; A radar array includes N array elements, each array element transmits a pulse coded signal, and receives target echo signals transmitted by all array elements with pulse coded signals; A data collection unit is used to collect the target echo signal received by each radiation array element to form target echo data; The array signal decoding and processing unit is used to decode the collected target echo data and separate the N corresponding to the combination of transceiver channels formed by different radiation array elements. 2 Target echo data of independent channel signals; An imaging processor is used to perform imaging processing on target echo data corresponding to different transceiver channel combinations to obtain a radar image; The target detection processor is used to perform target detection processing on the target echo data corresponding to different transceiver channel combinations to achieve target detection.

6. The system according to claim 5, characterized in that Also includes, An integrated display unit is used to visualize radar image data and detected target data to form a video stream containing radar images, radar targets and their information; The control unit is used to control the coding array to realize the signal generation, transmission and reception, acquisition, processing and display data generation of the simultaneous imaging and detection system.

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