CN114236491A - Method and system for realizing simultaneous imaging and detection based on coding array - Google Patents
Method and system for realizing simultaneous imaging and detection based on coding array Download PDFInfo
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Abstract
The invention relates to a method and a system for realizing simultaneous imaging and detection based on a coding array; the method comprises the following steps: giving a separate coding pulse signal to each radiating array element of the radar array; the separate coded pulse signals enable echo signals generated by target reflection to be separable in time, space or frequency; or the echo signals can be separated after decoding processing; when the radar works, each radiating array element of the radar array transmits a respective coded pulse signal, and each radiating array element receives echo signals of the coded pulse signals transmitted by the radiating array element and other radiating array elements; collecting the echo signals received by each radiation array element, and decoding; and according to the decoded echo signal, performing imaging processing and signal detection processing, and simultaneously obtaining a radar image and a moving target detection result. The invention improves the system performance of simultaneously realizing the imaging and the detection of the radar, and can flexibly adjust the imaging performance and the moving target detection performance.
Description
Technical Field
The invention belongs to the technical field of radars, and particularly relates to a method and a system for realizing simultaneous imaging and detection based on a coding array.
Background
The radar is a radio remote sensing detection device which obtains target information by transmitting detection signals and receiving reflection signals of a target, can realize the detection of a static target and a moving target, and can realize the high-resolution imaging of the radar and obtain the target image information by an aperture synthesis technology.
In the prior art, a synthetic aperture radar or an inverse synthetic aperture radar is usually used to realize high-resolution imaging of a target, and the two radars improve range resolution by using a pulse compression technology and improve azimuth resolution by using a synthetic aperture or an inverse synthetic aperture technology.
In the prior art, a pulse Doppler radar or an MTI radar is adopted to detect a moving target, the moving speed difference between the moving target and a background clutter is utilized, the background clutter is suppressed through a Doppler filtering technology, and the detection performance of the moving target is improved.
In the prior art, imaging and detection can be simultaneously realized, two radar technologies of a synthetic aperture radar and an MTI radar are fused, and imaging of a static target and detection of a moving target can be simultaneously realized, as shown in fig. 1. However, when two radars are integrated, it is difficult to simultaneously meet the design requirements of the two systems, and the synthetic aperture radar and the MTI radar have different requirements in terms of signal waveform, signal bandwidth, signal accumulation mode, signal accumulation time, and the like.
Therefore, there is a need in the art for a radar operating method and system that can overcome the problem that the conventional imaging radar and the pulse doppler radar or the MTI radar work at high performance simultaneously, and can flexibly configure imaging and detection performance according to requirements.
Disclosure of Invention
In view of the above analysis, the present invention aims to disclose a method and a system for implementing simultaneous imaging and detection based on a coding array, which overcome the disadvantages of the conventional imaging radar and moving object detection radar, and meet the requirement for improving the system performance of the radar for implementing simultaneous imaging and detection.
The invention discloses a method for realizing simultaneous imaging and detection based on a coding array, which comprises the following steps:
giving a separate coding pulse signal to each radiating array element of the radar array; the separate coded pulse signals enable echo signals generated by target reflection to be separable in time, space or frequency; or the echo signals can be separated after decoding processing;
when the radar works, each radiating array element of the radar array transmits a respective coded pulse signal, and each radiating array element receives echo signals of the coded pulse signals transmitted by the radiating array element and other radiating array elements;
collecting the echo signals received by each radiation array element, and decoding; and according to the decoded echo signal, performing imaging processing and signal detection processing, and simultaneously obtaining a radar image and a moving target detection result.
Further, the individual code pulse signals are frequency division code pulse signals, time-phase combination code pulse signals, or time-phase-frequency combination code pulse signals.
Further, the separate coded pulse signal is a frequency division coded pulse signal; during transmission, each array element adopts different frequencies for transmission, and a transmission channel is isolated through the frequency; during receiving, after each array element receives an echo signal, echo signals corresponding to transmitting signals of different array elements are separated through frequency domain filtering;
the single coded pulse signal is a time-phase combined coded pulse signal, and the basic constraint of coding is that each coding channel is orthogonal to each other; when transmitting, each array element adopts different codes to transmit; during receiving, after each array element receives an echo signal, the echo signals corresponding to the transmitting signals of different array elements are separated through decoding processing;
the single coded pulse signal is a time-phase-frequency combined coded pulse signal, and the basic constraint of coding is that each coding channel is orthogonal to each other; when transmitting, each array element adopts different codes to transmit; during receiving, after each array element receives the echo signal, the echo signals corresponding to the transmitting signals of different array elements are separated through decoding processing.
Further, the acquiring the echo signal received by each radiating array element, and the decoding process includes:
for the frequency division encoding pulse signal, decoding processing is carried out in a frequency domain filtering mode;
for the time-phase combined coded pulse signal, a decoding matrix is obtained through the coding matrix, and then the echo signal is decoded by the decoding matrix; the decoding matrix corresponds to the encoding matrix and comprises pulse decoding modes corresponding to the pulse encoding modes of all array elements;
for the time-phase-frequency combined coded pulse signal, a decoding matrix is obtained through the coding matrix, and then the echo signal is processed by the decoding matrix; decoding the echo signal in a frequency filtering mode; the decoding matrix corresponds to the encoding matrix and comprises pulse decoding modes corresponding to the pulse encoding modes of all the array elements.
Further, in simultaneous imaging and detection,
the imaging processing is carried out by utilizing the phase difference between the target echo signals of the different coded pulses of each array element and the phase difference between the target echo signals of the different coded pulses of each array element, so as to obtain a radar image;
and the detection processing comprises the step of jointly carrying out target detection processing on the target echo signals of the array elements which are not coded with the pulse at the same time, or the step of independently carrying out target detection processing on the target echo signals of the array elements which are coded with the pulse at the same time.
Further, in the imaging process,
for decoded inclusion of N2Selecting corresponding channel data for subsequent processing according to the imaging resolution of target echo data of the independent channel signals, wherein N is the number of array elements; the method comprises the following steps:
1) frequency processing:
for echo signals of frequency division coding, after filtering processing is carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the imaging resolution requirement;
for echo signals of time-phase combined coding, after filtering processing and decoding processing are carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the imaging resolution requirement;
for echo signals of time-phase-frequency combined coding, after filtering processing and decoding processing are carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the imaging resolution requirement;
2) array element processing:
according to the imaging resolution requirement, selecting the number of array elements participating in imaging processing, and performing phase-shifting accumulation on echo signals of the selected array elements to obtain a synthetic signal; the synthetic antenna length corresponding to the array element number is not higher than the antenna length corresponding to the imaging resolution requirement, and the echo signals of the selected array elements are subjected to phase shift accumulation to obtain synthetic signals;
3) imaging processing:
and imaging the synthetic signal obtained by the array element processing according to the strip imaging mode or the bunching imaging mode.
Further, in the signal detection process,
for decoded inclusion of N2Selecting the data of a certain number of channels for frequency processing and frequency synthesis according to the resolution required by signal detection to obtain frequency bandwidth which is not lower than the frequency bandwidth corresponding to the resolution requirement required by signal detection; n is the number of array elements;
in the flying direction of the radar, dividing all array elements of the radar into 2 sub-arrays or 3 sub-arrays, and performing phase shift accumulation on echo signals of the array elements of each sub-array to obtain a synthetic signal; the phase of each array element phase shift does not change along with the position of radar motion;
for the division mode of 2 sub-arrays, a DPCA method is adopted to detect and process the moving target;
and for the division mode of 3 sub-arrays, detecting a moving target by adopting an ATI method.
Further, in the signal detection process,
for decoded inclusion of N2Selecting the data of a certain number of channels for frequency processing and frequency synthesis according to the resolution required by signal detection to obtain frequency bandwidth which is not lower than the frequency bandwidth corresponding to the resolution requirement required by signal detection; n is the number of array elements;
performing phase shift accumulation on echo signals of all array elements, wherein the phase shift of each array element changes along with the detection direction of the radar according to the detection direction;
performing phase shift accumulation on echo signals of all array elements aiming at D detection directions by parallel processing, and simultaneously obtaining high signal gains of the D detection directions;
the above-mentioned
Phi is a detection angle range, and theta is an angle width of the obtained high signal gain in space;
and carrying out conversion detection processing on detection signals obtained by multiple detection array element processing to detect the moving target.
The invention also discloses a system for realizing the simultaneous imaging and detecting method based on the coding array, which comprises the following steps:
the array coding signal generating unit is used for generating a single pulse coding signal transmitted by each radiating array element; the separate coded pulse signals enable echo signals generated by target reflection to be separable in time, space or frequency; or the echo signals can be separated after decoding processing;
the radar array comprises N array elements, each array element transmits a pulse code signal and receives target echo signals of all the array elements transmitting the pulse code signals;
the data acquisition unit is used for acquiring target echo signals received by each radiation array element to form target echo data;
the array signal decoding processing unit is used for decoding the acquired target echo data and separating N corresponding to the receiving and transmitting channel combination formed by different radiation array elements2Target echo data of individual channel signals;
the imaging processor is used for carrying out imaging processing on target echo data corresponding to different receiving and transmitting channel combinations to obtain radar images;
the target detection processor is used for carrying out target detection processing on target echo data corresponding to different receiving and transmitting channel combinations to realize target detection.
The comprehensive display unit is used for carrying out visualization processing on the radar image data and the detection target data to form a video stream containing radar images, radar targets and information of the radar targets;
and the control unit is used for controlling the coding array to realize the signal generation, the transceiving, the acquisition, the processing and the data display generation of the simultaneous imaging and detecting system.
The invention can realize at least one of the following beneficial effects:
(1) the invention improves the system performance of simultaneously realizing the imaging and the detection of the radar. By utilizing array pulse coding, the flexible coverage of a detection space can be realized, the requirements of imaging detection and moving target detection on radar waveforms and parameters are considered, and high-performance imaging and high-performance moving target detection are realized.
(2) Different array pulse encoding and decoding methods can be selected, the imaging method and the detection method can be flexibly configured, and the imaging performance and the moving target detection performance can be flexibly adjusted.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a schematic diagram of the operation of synthetic aperture radar imaging and MTI detection according to the prior art;
FIG. 2 is a schematic diagram of a method for implementing simultaneous imaging and detection based on a coded array in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a radar system with simultaneous imaging and detection in an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
One embodiment of the present invention discloses a method for realizing simultaneous imaging and detection based on a coding array, as shown in fig. 2, comprising the following steps:
step S1, endowing each radiating array element of the radar array with an individual coded pulse signal;
the separate coded pulse signals enable echo signals generated by target reflection to be separable in time or space or frequency; or the echo signals may be separable after the decoding process.
Preferably, the separate coded pulse signal is a frequency division coded pulse signal. During transmission, each array element adopts different frequencies to transmit, and the transmitting channels are isolated through the frequencies, and during receiving, after each array element receives echo signals, the echo signals corresponding to the transmitting signals of different array elements are separated through frequency domain filtering;
preferably, the individual code pulse signals are time-phase combined code pulse signals, and the basic constraint of the code is that the code channels are orthogonal to each other. During transmission, each array element adopts different codes for transmission, and during reception, after each array element receives echo signals, the echo signals corresponding to the transmission signals of different array elements are separated through decoding processing;
preferably, the individual coded pulse signals are time-phase-frequency combined coded pulse signals, and the basic constraint of coding is that the coding channels are orthogonal to each other, and each array element is transmitted by using different codes. During receiving, after each array element receives an echo signal, the echo signals corresponding to the transmitting signals of different array elements are separated through decoding processing;
step S2, when the radar works, each radiating array element of the radar array transmits respective coded pulse signals;
specifically, each radiating array element of the radar array transmits a respective coded pulse signal according to the fact that a separate coded pulse signal is given to the radiating array element of each radar array.
Step S3, receiving an echo signal of the coded pulse by the radar array;
each radiating array element receives an echo signal of a self-transmitted coded pulse signal and echo signals of coded pulse signals transmitted by other radiating array elements; and the problem of transmitting signal interference between channels is solved through frequency isolation or coding and decoding isolation.
Step S4, collecting echo signals received by each radiation array element, and decoding the echo signals;
for the frequency division encoding pulse signal, decoding processing is carried out in a frequency domain filtering mode;
for the time-phase combined coded pulse signal, a decoding matrix is obtained through the coding matrix, and then the echo signal is processed by the decoding matrix to complete decoding processing;
for the time-phase-frequency combined coding pulse signal, a decoding matrix is obtained through the coding matrix, then the echo signal is processed by the decoding matrix, and the decoding processing is completed in combination with a frequency filtering mode.
Step S5, according to the decoded echo signal, simultaneously performing imaging processing and signal detection processing to obtain a radar image and a moving target detection result;
different array pulse encoding and decoding methods can be selected, the imaging method and the detection method can be flexibly configured, and the imaging performance and the moving target detection performance can be flexibly adjusted. And flexible coverage of the detection space is realized.
Specifically, the imaging processing method includes:
and imaging processing is carried out by utilizing the phase difference between the target echo signals of the different coded pulses of each array element and the phase difference between the target echo signals of the different coded pulses of each array element, so as to obtain a radar image.
For decoded echo dataIs composed of N2And selecting the data of the channels with determined number for subsequent processing according to the imaging resolution ratio, wherein the data (N is the number of array elements) of the signals of the independent channels:
1) frequency processing:
for echo signals of frequency division coding, after filtering processing is carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the imaging resolution requirement;
for echo signals of time-phase combined coding, after filtering processing and decoding processing are carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the imaging resolution requirement;
for echo signals of time-phase-frequency combined coding, after filtering processing and decoding processing are carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the imaging resolution requirement;
2) array element processing:
in addition, the number of array elements participating in imaging processing is selected according to the requirement of imaging resolution, the length of a synthetic antenna corresponding to the number of array elements is not higher than that of an antenna corresponding to the requirement of imaging resolution, and the echo signals of the selected array elements are subjected to phase-shifting accumulation to obtain synthetic signals;
and determining the phase of each array element phase shift according to different SAR imaging modes, wherein for the strip imaging mode, the phase of each array element phase shift does not change along with the position of radar motion, and for the beamforming imaging mode, the phase of each array element phase shift changes along with the position of radar motion.
3) Imaging processing:
and according to the imaging mode, carrying out imaging processing on the synthetic signal obtained by the array element processing.
Specifically, the signal detection processing method includes:
the signal detection processing on the echo signal received by each array element may be target detection processing on target echo signals of different coded pulses of the array elements in a combined manner; or target echo signals of the array elements and the coded pulses are independently subjected to target detection processing, so that target detection is realized.
For the decoded echo data, N is included2And selecting the data of the channels with determined number for subsequent processing according to the resolution required by signal detection on the data (N is the number of array elements) of the signals of the independent channels:
1) frequency processing:
for echo signals of frequency division coding, after filtering processing is carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the resolution requirement required by signal detection;
for echo signals of time-phase-frequency combined coding, after the received data is filtered and decoded, the frequency synthesis is carried out, the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the resolution requirement required by signal detection,
2) after the frequency processing, two processing modes are adopted:
(1) treatment method 1:
array element processing:
dividing all array elements of the radar into 2 sub-arrays or 3 sub-arrays in the flying direction of the radar, and performing phase-shifting accumulation on echo signals of the array elements of each sub-array to obtain a synthetic signal; the phase of each array element phase shift does not change along with the position of radar motion;
detection treatment:
for the division mode of 2 sub-arrays, a DPCA method is adopted to detect and process the moving target;
for the segmentation mode of 3 sub-arrays, detecting and processing a moving target by adopting an ATI method;
(2) treatment method 2:
array element processing:
all array elements of the radar are utilized, echo signals of all array elements are subjected to phase shift accumulation, the phase shift of each array element is changed along with the detection direction of the radar according to the detection direction, and high signal gain in a specific direction is obtained through the phase shift radar, so that high signal gain in the specific detection direction is realized;
performing phase shift accumulation on echo signals of all array elements by parallel processing aiming at D detection directions, and simultaneously obtaining high signal gains of the D detection directions, thereby realizing high gain detection coverage in a specific direction and range;
d is chosen in relation to the angular width theta and the detection angular range phi in space of the obtained high signal gain,
the high gain coverage range of D different directions obtained after array element processing is not less than the detection angle range;
detection treatment:
and detecting the moving target through the change of the angle of the moving target detected for many times, namely the moving target appears in the data corresponding to different detection directions.
Before detection processing, detection signals obtained by processing adjacent multiple detection array elements can be accumulated firstly, and then difference processing is carried out on different radar detection signals after accumulation, so that a moving target is detected.
The transform detection process may employ coherent change detection or incoherent change detection.
Step S6, comprehensively displaying the radar image and the target detection result;
and step S7, displaying the radar image and the moving target information subjected to the integrated display processing on the display device.
Another embodiment of the present invention discloses a system for implementing simultaneous imaging and detection by using a coding array, as shown in fig. 3, including:
an array code signal generating unit configured to generate a separate pulse code signal transmitted by each radiating array element;
the separate encoded signals are separable in time or space or frequency for the echo signals produced by the encoded signals at the target, or by a decoding process.
The radar array comprises N array elements, each array element transmits a pulse code signal and receives target echo signals of all the array elements transmitting the pulse code signals; the circulator is respectively connected with the transmitter, the receiver and the array element and is used for transmitting a radiation signal output by the transmitter to the array element for radiation or outputting a target echo signal received by the array element to the receiver for receiving and processing. And the circulator realizes the receiving and transmitting isolation of the radar.
For each array element of the radar array, the ability to transmit an independent coded signal should be provided when transmitting, and the ability to receive an independent echo signal should be provided when receiving.
Connected with the transmitter of each array element is an individual pulse code signal which is generated by the array code signal generating unit and corresponds to the array element;
the output of the receiver of each array element is connected with a data acquisition unit;
the data acquisition unit is configured to acquire a target echo signal received by each radiation array element to form target echo data;
the data acquisition unit can be used for independently acquiring the echo signals of each array element, or mixing the echo signals of N array elements together (N >1), and then acquiring the mixed signals.
The array signal decoding processing unit is configured to decode the acquired target echo data and separate out target echo data corresponding to a receiving and transmitting channel combination formed by different radiation array elements;
for frequency division coding, echo data acquired corresponding to echo signals received by each array element are subjected to frequency domain filtering processing through a filter bank corresponding to the number of the array elements, and each filter outputs echo signals corresponding to the frequency of a transmitting array element;
for time-phase combined coding, echo data acquired corresponding to echo signals received by each array element is calculated with a decoding matrix to obtain output decoding signals corresponding to the number of the array elements.
For time-phase-frequency combined coding, echo data acquired corresponding to echo signals received by each array element are calculated with a decoding matrix, and frequency domain filtering processing is respectively carried out to obtain output decoding signals corresponding to the number of the array elements.
The imaging processor is configured to perform imaging processing on target echo data corresponding to different transceiving channel combinations to obtain radar images;
the target detection processor is configured for carrying out target detection processing on target echo data corresponding to different transceiving channel combinations to realize target detection;
the comprehensive display unit is configured for performing visualization processing on the radar image data and the detection target data to form a video stream containing radar images, radar targets and information of the radar targets;
and the control unit is configured for controlling the coding array to realize signal generation, transceiving, acquisition, processing and display data generation of the simultaneous imaging and detection system.
The control unit generates system working synchronous signals, the system working synchronous signals comprise signal generation synchronous signals, signal acquisition synchronous signals and receiving and transmitting protection synchronous signals, each array element is provided with independent signal generation synchronous signals, signal acquisition synchronous signals and receiving and transmitting protection synchronous signals, strict synchronous relation is kept between the signal generation synchronous signals and the signal acquisition synchronous signals corresponding to each array element, and the synchronous requirement is not lower than the time synchronous requirement of SAR imaging.
It should be noted that the above description omits some more specific technical details that are well known to those skilled in the art and that may be necessary for the implementation of the embodiments of the present invention in order to make the embodiments of the present invention easier to understand. For example, the above description omits a general description of an existing radar or radar system. It should be understood that a continuous pulse radar according to embodiments of the present invention may have other components or assemblies in addition to the transmitters, receivers, and signal recoverers described above that are present in existing radars or radar systems. The foregoing description is by way of example only and is not intended as limiting.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (10)
1. A method for realizing simultaneous imaging and detection based on a coding array is characterized by comprising the following steps:
giving a separate coding pulse signal to each radiating array element of the radar array; the separate coded pulse signals enable echo signals generated by target reflection to be separable in time, space or frequency; or the echo signals can be separated after decoding processing;
when the radar works, each radiating array element of the radar array transmits a respective coded pulse signal, and each radiating array element receives echo signals of the coded pulse signals transmitted by the radiating array element and other radiating array elements;
collecting the echo signals received by each radiation array element, and decoding; and according to the decoded echo signal, performing imaging processing and signal detection processing, and simultaneously obtaining a radar image and a moving target detection result.
2. The method of claim 1, wherein the individual coded pulse signals are frequency-divided coded pulse signals, time-phase combined coded pulse signals, or time-phase-frequency combined coded pulse signals.
3. The method of claim 2,
the single coded pulse signal is a frequency division coded pulse signal; during transmission, each array element adopts different frequencies for transmission, and a transmission channel is isolated through the frequency; during receiving, after each array element receives an echo signal, echo signals corresponding to transmitting signals of different array elements are separated through frequency domain filtering;
the single coded pulse signal is a time-phase combined coded pulse signal, and the basic constraint of coding is that each coding channel is orthogonal to each other; when transmitting, each array element adopts different codes to transmit; during receiving, after each array element receives an echo signal, the echo signals corresponding to the transmitting signals of different array elements are separated through decoding processing;
the single coded pulse signal is a time-phase-frequency combined coded pulse signal, and the basic constraint of coding is that each coding channel is orthogonal to each other; when transmitting, each array element adopts different codes to transmit; during receiving, after each array element receives the echo signal, the echo signals corresponding to the transmitting signals of different array elements are separated through decoding processing.
4. The method of claim 3, wherein the collecting the echo signals received by each radiating element, and performing decoding processing comprises:
for the frequency division encoding pulse signal, decoding processing is carried out in a frequency domain filtering mode;
for the time-phase combined coded pulse signal, a decoding matrix is obtained through the coding matrix, and then the echo signal is decoded by the decoding matrix; the decoding matrix corresponds to the encoding matrix and comprises pulse decoding modes corresponding to the pulse encoding modes of all array elements;
for the time-phase-frequency combined coded pulse signal, a decoding matrix is obtained through the coding matrix, and then the echo signal is processed by the decoding matrix; decoding the echo signal in a frequency filtering mode; the decoding matrix corresponds to the encoding matrix and comprises pulse decoding modes corresponding to the pulse encoding modes of all the array elements.
5. The method of claim 2, wherein in simultaneous imaging and detection,
the imaging processing is carried out by utilizing the phase difference between the target echo signals of the different coded pulses of each array element and the phase difference between the target echo signals of the different coded pulses of each array element, so as to obtain a radar image;
and the detection processing comprises the step of jointly carrying out target detection processing on the target echo signals of the array elements which are not coded with the pulse at the same time, or the step of independently carrying out target detection processing on the target echo signals of the array elements which are coded with the pulse at the same time.
6. The method of claim 5, wherein, in the imaging process,
for decoded inclusion of N2Selecting corresponding channel data for subsequent processing according to the imaging resolution of target echo data of the independent channel signals, wherein N is the number of array elements; the method comprises the following steps:
1) frequency processing:
for echo signals of frequency division coding, after filtering processing is carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the imaging resolution requirement;
for echo signals of time-phase combined coding, after filtering processing and decoding processing are carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the imaging resolution requirement;
for echo signals of time-phase-frequency combined coding, after filtering processing and decoding processing are carried out on received data, frequency synthesis is carried out, and the frequency bandwidth after synthesis is not lower than the frequency bandwidth corresponding to the imaging resolution requirement;
2) array element processing:
according to the imaging resolution requirement, selecting the number of array elements participating in imaging processing, and performing phase-shifting accumulation on echo signals of the selected array elements to obtain a synthetic signal; the synthetic antenna length corresponding to the array element number is not higher than the antenna length corresponding to the imaging resolution requirement, and the echo signals of the selected array elements are subjected to phase shift accumulation to obtain synthetic signals;
3) imaging processing:
and imaging the synthetic signal obtained by the array element processing according to the strip imaging mode or the bunching imaging mode.
7. The method according to claim 5, wherein, in the signal detection process,
for decoded inclusion of N2Selecting the data of a certain number of channels for frequency processing and frequency synthesis according to the resolution required by signal detection to obtain frequency bandwidth which is not lower than the frequency bandwidth corresponding to the resolution requirement required by signal detection; n is the number of array elements;
in the flying direction of the radar, dividing all array elements of the radar into 2 sub-arrays or 3 sub-arrays, and performing phase shift accumulation on echo signals of the array elements of each sub-array to obtain a synthetic signal; the phase of each array element phase shift does not change along with the position of radar motion;
for the division mode of 2 sub-arrays, a DPCA method is adopted to detect and process the moving target;
and for the division mode of 3 sub-arrays, detecting a moving target by adopting an ATI method.
8. The method of claim 1, wherein, in the signal detection process,
for decoded inclusion of N2Selecting the data of a certain number of channels for frequency processing and frequency synthesis according to the resolution required by signal detection to obtain frequency bandwidth which is not lower than the frequency bandwidth corresponding to the resolution requirement required by signal detection; n is the number of array elements;
performing phase shift accumulation on echo signals of all array elements, wherein the phase shift of each array element changes along with the detection direction of the radar according to the detection direction;
performing phase shift accumulation on echo signals of all array elements aiming at D detection directions by parallel processing, and simultaneously obtaining high signal gains of the D detection directions;
the above-mentioned
Phi is a detection angle range, and theta is an angle width of the obtained high signal gain in space;
and carrying out conversion detection processing on detection signals obtained by multiple detection array element processing to detect the moving target.
9. A system for implementing a simultaneous imaging and detection method based on the coding array of any one of claims 1-8, comprising:
the array coding signal generating unit is used for generating a single pulse coding signal transmitted by each radiating array element; the separate coded pulse signals enable echo signals generated by target reflection to be separable in time, space or frequency; or the echo signals can be separated after decoding processing;
the radar array comprises N array elements, each array element transmits a pulse code signal and receives target echo signals of all the array elements transmitting the pulse code signals;
the data acquisition unit is used for acquiring target echo signals received by each radiation array element to form target echo data;
the array signal decoding processing unit is used for decoding the acquired target echo data and separating N corresponding to the receiving and transmitting channel combination formed by different radiation array elements2Target echo data of individual channel signals;
the imaging processor is used for carrying out imaging processing on target echo data corresponding to different receiving and transmitting channel combinations to obtain radar images;
the target detection processor is used for carrying out target detection processing on target echo data corresponding to different receiving and transmitting channel combinations to realize target detection.
10. The system of claim 9, further comprising,
the comprehensive display unit is used for performing visual processing on the radar image data and the detection target data to form a video stream containing radar images, radar targets and information of the radar targets;
and the control unit is used for controlling the coding array to realize the signal generation, the transceiving, the acquisition, the processing and the data display generation of the simultaneous imaging and detecting system.
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