CN116184340B - Distributed synthetic aperture radar verification system and method - Google Patents
Distributed synthetic aperture radar verification system and method Download PDFInfo
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- CN116184340B CN116184340B CN202310465334.5A CN202310465334A CN116184340B CN 116184340 B CN116184340 B CN 116184340B CN 202310465334 A CN202310465334 A CN 202310465334A CN 116184340 B CN116184340 B CN 116184340B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/40—Means for monitoring or calibrating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging
- G01S13/90—Radar or analogous systems specially adapted for specific applications for mapping or imaging using synthetic aperture techniques, e.g. synthetic aperture radar [SAR] techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/41—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
Abstract
The invention provides a distributed synthetic aperture radar verification system and a method, wherein the system comprises a first power attenuator, a second power attenuator, a third power attenuator, an optical delay line and a power divider. The first power attenuator is connected with the radar transmitting end of the main station and the optical delay line; the optical delay line is connected with the first power attenuator and the power divider; the power divider is connected with the optical delay line, the radar receiving end of the master station and the N radar receiving ends of the slave stations; the second power attenuator is connected with the transmitting end of the master station synchronous equipment and the receiving ends of N slave station synchronous equipment; and the third power attenuator is connected with N slave station synchronous equipment transmitting ends and the master station synchronous equipment receiving ends. The verification method extracts time synchronization errors and phase synchronization errors by collecting test data, compensates the time synchronization errors and the phase synchronization errors to the secondary station radar echo data, and checks the compression characteristics of signals in pulses and the phase stability of signals between pulses through pulse compression to verify the performance of the distributed synthetic aperture radar system. The invention can verify the stability and coherent processing capability of the distributed synthetic aperture radar system.
Description
Technical Field
The invention relates to the technical field of radar information acquisition and processing, in particular to a distributed Synthetic Aperture Radar (SAR) verification system and method, which are used for verifying the performance and index of signals in a distributed SAR system.
Background
Compared with the traditional single-station SAR, the distributed SAR adopts a radar receiving and dispatching split design, has flexible geometric configuration, can flexibly change the base line length to meet different reference processing requirements, can acquire scattering information of ground object targets in different directions, and has wider application prospect.
The distributed SAR system is more complex in composition and comprises a main station and N secondary station multiple radar devices, wherein the main station radar is responsible for transmitting and receiving target scene echo signals, and the secondary station radar is responsible for receiving the target scene echo signals transmitted by the main station radar; meanwhile, in order to ensure the time synchronization and the phase synchronization of radar signals, the system also comprises two synchronization devices of a master station and a slave station, which are used for mutually receiving and transmitting the synchronization signals and correcting and compensating the synchronization errors generated in the radar operation. Therefore, in the distributed SAR system, the accuracy of synchronization error correction between the master station and the slave station becomes an important issue for restricting the coherent processing capability of the system.
The accuracy of the synchronization error correction of the distributed SAR depends on various factors, wherein the first factor is the self stability of the distributed SAR system. In order to verify the system stability of the distributed SAR, a specific method needs to be adopted to effectively verify the system stability under the premise of excluding interference of other influencing factors. Therefore, it is necessary to design a verification system and a verification method for the distributed SAR system to achieve the purpose of verifying the stability of the distributed SAR system.
Disclosure of Invention
In order to solve the technical problems, the invention provides a distributed synthetic aperture radar verification system and a method, which can verify the stability of the distributed synthetic aperture radar system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the distributed synthetic aperture radar verification system comprises a first power attenuator, a second power attenuator, a third power attenuator, an optical delay line and a power divider, wherein the input end of the first power attenuator is connected with the transmitting end of a main station radar device in the distributed synthetic aperture radar system, and the output end of the first power attenuator is connected with the input end of the optical delay line; the output end of the optical delay line is connected with the input end of the power divider; the output end of the power divider is respectively connected with the receiving end of the main station radar equipment and the receiving ends of N secondary station radar equipment in the distributed synthetic aperture radar system; the input end of the second power attenuator is connected with the transmitting end of the master station synchronization equipment in the distributed synthetic aperture radar system, and the output end of the second power attenuator is connected with the receiving ends of N slave station synchronization equipment in the distributed synthetic aperture radar system; the input end of the third power attenuator is connected with the transmitting ends of N slave station synchronous devices in the distributed synthetic aperture radar system, and the output end of the third power attenuator is connected with the receiving end of the master station synchronous device in the distributed synthetic aperture radar system.
Furthermore, each module in the system is connected by adopting an SMA coaxial cable applicable to 0-18 GHz.
Further, attenuation values of the first power attenuator, the second power attenuator and the third power attenuator are all adjustable, and the adjustment range is 0 dB-50 dB.
Further, the optical delay line is an active component, and the first power attenuator, the second power attenuator, the third power attenuator and the power divider are passive components.
The invention also provides a verification method of the distributed synthetic aperture radar verification system, which comprises the following steps:
collecting test data, wherein the test data comprises echo data and synchronous signal data of a main station and N secondary stations of a radar;
extracting a time synchronization error and a phase synchronization error from synchronous signal data of a master station and N slave stations of the radar by processing the synchronous signal data;
and compensating the extracted time synchronization errors and phase synchronization errors to echo data of N secondary stations of the radar, performing pulse compression, and then checking compression characteristics of the intra-pulse signals and phase stability of the inter-pulse signals, thereby verifying the system performance of the distributed synthetic aperture radar.
Further, the collecting test data includes: after the self-distributed synthetic aperture radar is connected with the verification system, linear frequency modulation signals are transmitted and received, and the received signals are respectively recorded in a storage module of a master station radar device, a slave station radar device, a master station synchronization device and a slave station synchronization device of the distributed synthetic aperture radar; the echo data of the master station and the slave station of the radar are echo data formed by an optical delay line in a distributed synthetic aperture radar verification system; the pulse compression is to multiply a linear frequency modulation echo signal with a large time-width bandwidth with a reference function for matched filtering, and the linear frequency modulation echo signal is compressed to form a narrow time-width signal; and the phase stability of the inter-pulse signals is checked by extracting peak point phases obtained by compressing the inter-pulse signals of each pulse, and a comparison result between a phase change trend and a phase change threshold value is obtained.
The scheme of the invention at least comprises the following beneficial effects:
according to the scheme, the distributed synthetic aperture radar system is connected with the verification system, test data are collected, the test data are processed through the verification method, the system stability of the distributed synthetic aperture radar is verified, and the coherent processing capacity of the distributed synthetic aperture radar system is verified.
Drawings
Fig. 1 is a block diagram of a distributed synthetic aperture radar verification system of the present invention.
Fig. 2 is a diagram of time synchronization error and phase synchronization error extracted from a master-slave synchronization signal.
Fig. 3 is a plot of peak point position and phase after pulse compression of the radar light delay line echo signal of the master station.
Fig. 4 is a graph of peak point position and phase after pulse compression after synchronization error compensation of the slave station radar optical delay line echo signals.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The distributed synthetic aperture radar system is characterized in that a radar master station transmits linear frequency modulation signal pulses, an obtained target reflected echo signal is received by the master station radar equipment in a first route, and is received by a slave station radar equipment in a second route, and the two routes of signals of the master station and the slave station form interference signals of the target, so that subsequent imaging and interference processing are carried out. Since there is a synchronization error between the secondary station radar apparatus and the primary station radar apparatus, it is necessary to extract and correct and compensate for the synchronization error. The synchronization error is extracted by adopting synchronization equipment of a master station and a slave station to mutually transmit and receive synchronization signals and acquire the synchronization signals.
The self stability of the distributed synthetic aperture radar system is a precondition that the synchronous error can be effectively extracted and the high-precision interference processing is realized. And verifying the stability of the distributed synthetic aperture radar system by adopting a distributed synthetic aperture radar verification system and a verification method.
The connection relation between the distributed synthetic aperture radar verification system and the distributed synthetic aperture radar system is shown in fig. 1. The distributed synthetic aperture radar verification system comprises a first power attenuator 1, a second power attenuator 4, a third power attenuator 5, an optical delay line 2 and a power divider 3. The input end of the first power attenuator 1 is connected with the transmitting end of the main station radar equipment in the distributed synthetic aperture radar system, and the output end of the first power attenuator is connected with the optical delay line 2; the input end of the optical delay line 2 is connected with the first power attenuator 1, and the output end is connected with the power divider 3; the input end of the power divider 3 is connected with the optical delay line 2, and the output end of the power divider is respectively connected with the receiving end of the main station radar equipment and the receiving ends of N secondary station radar equipment in the distributed synthetic aperture radar system; the input end of the second power attenuator 4 is connected with the transmitting end of the master station synchronization equipment in the synthetic aperture radar system, and the output end of the second power attenuator is connected with the receiving ends of N slave station synchronization equipment in the distributed synthetic aperture radar system; the input end of the third power attenuator 5 is connected with the transmitting ends of N slave station synchronous devices in the distributed synthetic aperture radar system, and the output end is connected with the receiving end of the master station synchronous device in the distributed synthetic aperture radar system. In a distributed synthetic aperture radar system, a master station radar provides a master station synchronous clock signal to a master station synchronous device, and a slave station radar provides a slave station synchronous clock signal to a slave station synchronous device.
In this embodiment of the invention, each module in the distributed synthetic aperture radar verification system is connected using SMA coaxial cables.
In the embodiment of the invention, the attenuation values of the first power attenuator 1, the second power attenuator 4 and the third power attenuator 5 of the distributed synthetic aperture radar verification system are adjustable, and the adjustment range is 0 dB-50 dB, so as to prevent the damage to system equipment caused by excessive signal strength; the optical delay line 2 is an active component, and the first power attenuator 1, the second power attenuator 4, the third power attenuator 5 and the power divider 3 are passive components.
The verification method of the distributed synthetic aperture radar verification system comprises the following steps: collecting test data, including echo data and synchronous signal data of a radar master station and a radar slave station; extracting a time synchronization error and a phase synchronization error from the synchronous signal data of the master station and the slave station by processing the synchronous signal data; and compensating the extracted time synchronization error and phase synchronization error to echo data of a radar slave station, checking compression characteristics of the intra-pulse signals and phase stability of the inter-pulse signals after pulse compression, and verifying the system performance of the distributed synthetic aperture radar.
In this embodiment of the present invention, after the test data is collected from the distributed synthetic aperture radar and connected to the verification system thereof, a chirp signal is transmitted and received, and the received signals are recorded in the storage modules of the master station radar device, the slave station radar device, the master station synchronization device and the slave station synchronization device of the distributed synthetic aperture radar, respectively; the echo data of the radar master station and the radar slave station are echo data formed by an optical delay line 2 in a distributed synthetic aperture radar verification system; the pulse compression is to multiply a linear frequency modulation echo signal with a large time-width bandwidth with a reference function for matched filtering, and the linear frequency modulation echo signal is compressed to form a narrow time-width signal; the phase stability of the inter-pulse signals is a comparison result between the obtained phase change trend and a phase change threshold value, wherein the peak point phase is obtained by compressing the inter-pulse signals of each pulse.
In an exemplary embodiment of the present invention, a distributed synthetic aperture radar verification system and a verification method are adopted to obtain a master-slave station synchronization signal, and a time synchronization error and a phase synchronization error result are extracted from the master-slave station synchronization signal as shown in fig. 2; the pulse compression peak point position and phase result obtained by pulse compressing the collected main station optical delay line echo signals are shown in fig. 3. Since the radar signal of the main station spontaneously self-receives and has no synchronization error, as can be seen from fig. 3, the pulse compression peak point positions of different pulse acquisition times are all the same value, the phases of the pulse compression peak point positions are consistent, and the pulse compression peak point positions are changed within the range of +/-0.1 degrees. The acquired secondary station optical delay line echo signals are subjected to synchronous error correction and compensation, pulse compression peak point positions and phase results obtained after pulse compression are shown in fig. 4, and after synchronous error correction and compensation, as can be seen from fig. 4, the pulse compression peak point positions of different pulse acquisition times are compensated to the same value, and the phases of the pulse compression peak point positions are consistent and change within a range of +/-0.3 degrees. The stability of the distributed synthetic aperture radar system can be verified accordingly.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (4)
1. The distributed synthetic aperture radar verification method is characterized in that the adopted distributed synthetic aperture radar verification system comprises a first power attenuator (1), a second power attenuator (4), a third power attenuator (5), an optical delay line (2) and a power divider (3), wherein the input end of the first power attenuator (1) is connected with the transmitting end of a main station radar device in the distributed synthetic aperture radar system, and the output end of the first power attenuator is connected with the input end of the optical delay line (2); the output end of the optical delay line (2) is connected with the input end of the power divider (3); the output end of the power divider (3) is respectively connected with the receiving end of the main station radar equipment and the receiving ends of N secondary station radar equipment in the distributed synthetic aperture radar system; the input end of the second power attenuator (4) is connected with the transmitting end of the master station synchronization equipment in the distributed synthetic aperture radar system, and the output end of the second power attenuator (4) is connected with the receiving ends of N slave station synchronization equipment in the distributed synthetic aperture radar system; the input end of the third power attenuator (5) is connected with the transmitting ends of N slave station synchronous devices in the distributed synthetic aperture radar system, and the output end of the third power attenuator (5) is connected with the receiving end of the master station synchronous device in the distributed synthetic aperture radar system; the verification method comprises the following steps:
collecting test data, wherein the test data comprises echo data and synchronous signal data of a main station and N secondary stations of a radar;
extracting a time synchronization error and a phase synchronization error from synchronous signal data of a master station and N slave stations of the radar by processing the synchronous signal data;
compensating the extracted time synchronization error and phase synchronization error to echo data of N secondary stations of the radar, checking compression characteristics of intra-pulse signals and phase stability of inter-pulse signals after pulse compression, and verifying system performance of the distributed synthetic aperture radar according to the compression characteristics;
the collecting test data includes: after the self-distributed synthetic aperture radar is connected with the verification system, linear frequency modulation signals are transmitted and received, and the received signals are respectively recorded in a storage module of a master station radar device, a slave station radar device, a master station synchronization device and a slave station synchronization device of the distributed synthetic aperture radar; the echo data of the master station and the slave station of the radar are echo data formed by an optical delay line (2) in a distributed synthetic aperture radar verification system; the pulse compression is to multiply a linear frequency modulation echo signal with a large time-width bandwidth with a reference function for matched filtering, and the linear frequency modulation echo signal is compressed to form a narrow time-width signal; and checking the phase stability of the inter-pulse signals, namely extracting peak point phases obtained by compressing the inter-pulse signals of each pulse to obtain a comparison result between the phase change trend and the phase change threshold value.
2. A distributed synthetic aperture radar verification method as claimed in claim 1, wherein: and the SMA coaxial cable is adopted for connection.
3. A distributed synthetic aperture radar verification method as claimed in claim 1, wherein: the attenuation values of the first power attenuator (1), the second power attenuator (4) and the third power attenuator (5) are adjustable, and the adjustment range is 0 dB-50 dB.
4. A distributed synthetic aperture radar verification method as claimed in claim 1, wherein: the optical delay line (2) is an active component, and the first power attenuator (1), the second power attenuator (4), the third power attenuator (5) and the power divider (3) are passive components.
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