CN111983577B - Airborne distributed SAR outfield test system and method - Google Patents
Airborne distributed SAR outfield test system and method Download PDFInfo
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- CN111983577B CN111983577B CN202010875043.XA CN202010875043A CN111983577B CN 111983577 B CN111983577 B CN 111983577B CN 202010875043 A CN202010875043 A CN 202010875043A CN 111983577 B CN111983577 B CN 111983577B
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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
Abstract
The invention discloses an airborne distributed SAR outfield test system and method, comprising a transmitter airborne system, a receiver airborne system, a follow-up platform and a ground application system; the transmitter airborne system and the receiver airborne system are respectively in communication connection with the ground application system, and the transmitter airborne system is in communication connection with the receiver airborne system; the servo platform is mechanically connected with a transmitter airborne system and a receiver airborne system, etc.; the invention provides an effective system-level verification scheme for detection, identification and positioning application of the distributed SAR imaging system, can be used for guiding an outfield suspension flight test, verifying key technologies such as distributed SAR real-time imaging, time-frequency synchronization, spatial configuration, target detection, identification and positioning and the like, and developing later distributed SAR engineering development work based on the key technologies.
Description
Technical Field
The invention relates to the field of detection, identification, positioning and application verification of a distributed SAR imaging system, in particular to an airborne distributed SAR outfield test system and method.
Background
Compared with the traditional single-base SAR, the distributed SAR has obvious advantages, can be applied to airplane formation and satellite formation, can realize tasks such as high-resolution imaging detection, moving target detection and identification, elevation map measurement and the like, has natural advantages such as all weather, strong anti-interference capability and the like, and can be widely applied to military and civil use.
At present, the distributed SAR is in an engineering verification stage, and the existing outfield flying test mainly comprises single-base SAR and double-base SAR imaging algorithm verification. The units of the university of electronic technology, the university of Beijing and the institute of technology, the institute of technology 2 institute of astronautics, 35 institute of technology and the like develop tests such as airborne flying and ground sports car and the like aiming at the double-base SAR, and the SAR image is successfully obtained, so that a certain achievement is achieved, but an effective system-level verification means is lacked in the aspect of detection, identification, positioning application and verification of a distributed SAR imaging system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides an airborne distributed SAR outfield test system, which can be used for guiding outfield suspension test, verifying key technologies such as distributed SAR real-time imaging, time-frequency synchronization, spatial configuration, target detection, identification and positioning and the like, and developing later distributed SAR engineering development work based on the key technologies.
The invention aims at realizing the following scheme:
an airborne distributed SAR outfield test system comprises a transmitter airborne system, a receiver airborne system, a follow-up platform and a ground application system; the transmitter airborne system and the receiver airborne system are respectively in communication connection with the ground application system, and the transmitter airborne system is in communication connection with the receiver airborne system; the follow-up platform is mechanically connected with the transmitter airborne system and the receiver airborne system; the transmitter airborne system comprises a transmitter processor, a transmitter data transmission baseband, a transmitter data transmission power amplifier, a transmitter front-end GPS antenna and a transmitter follow-up GPS antenna, wherein the transmitter processor is connected with the transmitter data transmission baseband, the transmitter data transmission baseband is connected with the transmitter data transmission power amplifier, and the transmitter data transmission power amplifier is respectively connected with the transmitter front-end GPS antenna and the transmitter follow-up GPS antenna; the receiver airborne system comprises a receiver processor, a receiver data transmission baseband, a receiver data transmission power amplifier, a receiver follow-up GPS antenna and a receiver front-end GPS antenna, wherein the receiver processor is connected with the receiver data transmission baseband, the receiver data transmission baseband is connected with the receiver data transmission power amplifier, and the receiver data transmission power amplifier is respectively connected with the receiver follow-up GPS antenna and the receiver front-end GPS antenna; the follow-up platform comprises a phased array front end and inertial navigation equipment, and is respectively connected with a transmitter airborne system and a receiver airborne system through a mechanical hanging tool; the inertial navigation device is connected with the front end of the phased array; the ground application system comprises upper computer software, an anti-interference processor, a target identification positioning processor, a ground data transmission baseband and a ground data transmission power amplifier; the upper computer software is in communication connection with the anti-interference processor, the anti-interference processor is in communication connection with the target identification positioning processor, the target identification positioning processor is connected with the ground data transmission baseband, and the ground data transmission baseband is connected with the ground data transmission power amplifier.
Further, the transmitter onboard system comprises a transmitter power supply, a transmitter distribution box and a transmitter water cooling device; the receiver onboard system comprises a receiver power supply, a receiver distribution box and a receiver water cooling device; the power supply is used for providing power requirements of 20V-32V, the distribution box is used for providing a power conversion function, and the water cooling device is used for cooling the front end of the phased array.
An airborne distributed SAR outfield test method, comprising:
step 1, respectively installing a data transmission antenna on a transmitter airborne system and a receiver airborne system, respectively installing a follow-up GPS antenna and a front-end GPS antenna on the transmitter airborne system and the receiver airborne system, respectively installing a power supply, a distribution box, a data transmission baseband, a data transmission power amplifier and a processor on the transmitter airborne system and the receiver airborne system, and installing a phased array front end and inertial navigation equipment on the follow-up platform;
step 2, starting up a ground airport double-base or multi-base imaging system, and performing inertial navigation ground calibration after self-checking and time-frequency synchronization are completed;
step 3, after two or more aircrafts take off, designing according to an imaging configuration, planning to fly according to a preset track, and entering a navigation point;
step 4, after the aircraft enters the navigation point, the transmitter airborne system transmits electromagnetic waves to the target imaging area, the receiver airborne system acquires the position, the gesture and the beam pointing information of the transmitter airborne system through a data link, and the receiver airborne system calculates the relative position relation of the target area according to the position and the gesture information of the receiver airborne system, so that the beam pointing of the receiving antenna is adjusted, the space synchronization is achieved, and the imaging processing and the echo data acquisition and storage are carried out according to the echo information of the target area; the receiver-mounted system sends the real-time imaging result to the ground upper computer software for display through a data link;
and 5, after receiving SAR image data, the ground system displays SAR image information of a target area on the upper computer software in real time, and verifies real-time imaging, time-frequency synchronization and spatial configuration through image resolution information, wherein an anti-interference processor performs interference cancellation on SAR images of multiple view angles of the same target area, performs target matching recognition and positioning on cancellation results, and finally feeds back recognition and positioning results to the upper computer software for display, and verifies anti-interference and recognition positioning.
In step 1, a data transmission antenna is respectively installed on the back and the belly of the transmitter airborne system and the receiver airborne system, a follow-up GPS antenna and a front-end GPS antenna are respectively installed on the back of the transmitter airborne system and the back of the receiver airborne system, and a power supply, a distribution box, a data transmission baseband, a data transmission power amplifier and a processor are respectively installed in the cabin of the transmitter airborne system and the receiver airborne system.
Further, the method comprises the step of airplane return, and after the step 3, two or more airplanes simultaneously go out of the navigation point, the transmitter onboard system stops transmitting electromagnetic waves, and the receiver onboard system stops collecting echoes.
Further, the ground system comprises an anti-interference processor, and the anti-interference processor is used for carrying out interference cancellation on SAR images of multiple view angles of the same target area, and carrying out target matching recognition and positioning on cancellation results.
The beneficial effects of the invention are as follows:
the invention provides an effective system-level verification scheme for detection, identification and positioning application of the distributed SAR imaging system, can be used for guiding an outfield suspension flight test, verifying key technologies such as distributed SAR real-time imaging, time-frequency synchronization, spatial configuration, target detection, identification and positioning and the like, and developing later distributed SAR engineering development work based on the key technologies.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of the data flow according to the present invention;
FIG. 3 is a schematic diagram of an airborne distributed SAR outfield test configuration of the present invention;
fig. 4 is a flow chart of method steps of the present invention.
Detailed Description
All of the features disclosed in all of the embodiments of this specification (including any accompanying claims, abstract and drawings), or all of the steps of any method or process so disclosed, may be combined or substituted in any way, except combinations where mutually exclusive of features and/or steps.
As shown in fig. 1 to 4, an airborne distributed SAR outfield test system comprises a transmitter airborne system, a receiver airborne system, a follow-up platform and a ground application system; the transmitter airborne system and the receiver airborne system are respectively in communication connection with the ground application system, and the transmitter airborne system is in communication connection with the receiver airborne system; the follow-up platform is mechanically connected with the transmitter airborne system and the receiver airborne system; the transmitter airborne system comprises a transmitter processor, a transmitter data transmission baseband, a transmitter data transmission power amplifier, a transmitter front-end GPS antenna and a transmitter follow-up GPS antenna, wherein the transmitter processor is connected with the transmitter data transmission baseband, the transmitter data transmission baseband is connected with the transmitter data transmission power amplifier, and the transmitter data transmission power amplifier is respectively connected with the transmitter front-end GPS antenna and the transmitter follow-up GPS antenna; the receiver airborne system comprises a receiver processor, a receiver data transmission baseband, a receiver data transmission power amplifier, a receiver follow-up GPS antenna and a receiver front-end GPS antenna, wherein the receiver processor is connected with the receiver data transmission baseband, the receiver data transmission baseband is connected with the receiver data transmission power amplifier, and the receiver data transmission power amplifier is respectively connected with the receiver follow-up GPS antenna and the receiver front-end GPS antenna; the follow-up platform comprises a phased array front end and inertial navigation equipment, and is respectively connected with a transmitter airborne system and a receiver airborne system through a mechanical hanging tool; the inertial navigation device is connected with the front end of the phased array; the ground application system comprises upper computer software, an anti-interference processor, a target identification positioning processor, a ground data transmission baseband and a ground data transmission power amplifier; the upper computer software is in communication connection with the anti-interference processor, the anti-interference processor is in communication connection with the target identification positioning processor, the target identification positioning processor is connected with the ground data transmission baseband, and the ground data transmission baseband is connected with the ground data transmission power amplifier.
Further, the invention provides a distributed SAR imaging recognition positioning system based on an airborne platform, which can be used for guiding an outfield suspension test, verifying key technologies such as distributed SAR real-time imaging, time-frequency synchronization, spatial configuration, target detection recognition positioning and the like, and developing later distributed SAR engineering development work based on the key technologies. Mainly comprises a transmitting/receiving machine-mounted system, a follow-up platform, a ground application system and the like.
The front-end GPS antenna is used for receiving GPS signals and generating PPS second pulses and 10Mhz signals; the follow-up GPS antenna is used for inertial navigation attitude measurement and position information acquisition; the water cooling machine is used for radiating and cooling the front end of the phased array; the power supply provides 20V-32V power demand for the airborne test system; the distribution box provides a power conversion function for each module of the test system; data link (data amplifier and data baseband): the data transmission functions of receiving and transmitting the data such as the gesture, the position and the like among all airborne test nodes are completed, and meanwhile, the system state parameters and the real-time SAR image information can be transmitted to a ground system; the front end of the phased array consists of an array element antenna and a comprehensive channel, is structurally compatible with a time-frequency processing board, and mainly achieves the functions of radar beam scanning, radio frequency signal receiving and transmitting, frequency scanning, up-down conversion, baseband signal generation and the like, and controls the functions through a signal processor. The time-frequency processing board is structurally arranged on the comprehensive channel, receives GPS signals to perform corresponding processing, and outputs synchronized 1PPS second pulses and 100MHz clock signals to the channel to complete the time-frequency synchronization function of the system among the receiving and transmitting nodes; the signal processor consists of an AD/DA conversion board, an imaging processing board (the emission platform can not be included), a storage board and a main control board, wherein the AD/DA completion board mainly completes functions of radar echo signal acquisition and recording, system data alignment/packaging and the like; the imaging processing board completes real-time imaging processing of the acquired echo; the storage board completes the storage function of data and imaging processing results; the main control board completes the functions of phased array front end control, system time sequence control, flow control, power-on control, inertial navigation/GPS positioning state parameter collection and the like.
The inertial measurement unit mainly measures the position, speed and attitude of the aircraft and outputs pulse numbers to a main control board of the signal processor in real time; GPS positioning navigation mainly measures the position and speed of an airplane, outputs position and speed information to a main board card of a signal processor in real time, and has the functions of track planning and navigation.
The follow-up platform is mainly used for installing the phased array front end, has a stable maintenance function, can keep the stability of the phased array antenna array surface in the flight process by arranging the follow-up frame angle, and enables the antenna array surface to point to a target area according to real-time accurate rotation of a space synchronization instruction.
The ground system comprises a data chain ground station, upper computer software and a target identification processor, wherein the data chain ground station is used for acquiring flight position information, state information and SAR image information of a transmitter/receiver airborne platform in real time; the upper computer software updates situation information and SAR images in real time according to the received data; the anti-interference processor removes interference in an image domain by adopting a distributed multi-view image cancellation technology according to SAR image information of different views returned by a plurality of nodes to obtain a high-resolution real-time SAR image; the target recognition processor takes the optical imaging of the target area as a template, and performs image matching on the SAR image subjected to the anti-interference processing and the optical template, so that a heterogeneous matching recognition result based on the image is obtained.
Further, the transmitter onboard system comprises a transmitter power supply, a transmitter distribution box and a transmitter water cooling device; the receiver onboard system comprises a receiver power supply, a receiver distribution box and a receiver water cooling device; the power supply is used for providing power requirements of 20V-32V, the distribution box is used for providing a power conversion function, and the water cooling device is used for cooling the front end of the phased array.
An airborne distributed SAR outfield test method, comprising:
step 1, respectively installing a data transmission antenna on a transmitter airborne system and a receiver airborne system, respectively installing a follow-up GPS antenna and a front-end GPS antenna on the transmitter airborne system and the receiver airborne system, respectively installing a power supply, a distribution box, a data transmission baseband, a data transmission power amplifier and a processor on the transmitter airborne system and the receiver airborne system, and installing a phased array front end and inertial navigation equipment on the follow-up platform;
step 2, starting up a ground airport double-base or multi-base imaging system, and performing inertial navigation ground calibration after self-checking and time-frequency synchronization are completed;
step 3, after two or more aircrafts take off, designing according to an imaging configuration, planning to fly according to a preset track, and entering a navigation point;
step 4, after the aircraft enters the navigation point, the transmitter airborne system transmits electromagnetic waves to the target imaging area, the receiver airborne system acquires the position, the gesture and the beam pointing information of the transmitter airborne system through a data link, and the receiver airborne system calculates the relative position relation of the target area according to the position and the gesture information of the receiver airborne system, so that the beam pointing of the receiving antenna is adjusted, the space synchronization is achieved, and the imaging processing and the echo data acquisition and storage are carried out according to the echo information of the target area; the receiver-mounted system sends the real-time imaging result to the ground upper computer software for display through a data link;
and 5, after receiving SAR image data, the ground system displays SAR image information of a target area on the upper computer software in real time, and verifies real-time imaging, time-frequency synchronization and spatial configuration through image resolution information, wherein an anti-interference processor performs interference cancellation on SAR images of multiple view angles of the same target area, performs target matching recognition and positioning on cancellation results, and finally feeds back recognition and positioning results to the upper computer software for display, and verifies anti-interference and recognition positioning.
The back and the belly of the transmitter/receiver carrying platform are respectively provided with a data transmission antenna to ensure the communication quality of air-space and air-ground data chains, the back is also provided with a follow-up and front-end GPS antenna, the cabin is internally provided with a power supply, a distribution box, a data transmission and processor and other devices, and the follow-up platform is provided with a phased array front-end and inertial navigation and other devices;
starting up a ground airport double/multi-base imaging system to finish self-checking and time-frequency synchronization;
calibrating an inertial navigation ground;
after the two/more aircrafts take off, designing according to an imaging configuration, planning to fly according to a preset track, and entering a navigation point;
after entering a navigation point, a transmitter machine transmits electromagnetic waves to a target imaging area, a receiver machine acquires position, posture and beam pointing information of the transmitter machine through a data chain, and the receiver machine calculates the relative position relation of the target area according to the position and posture information of the receiver machine, so that the beam pointing of a receiving antenna is adjusted, the purpose of space synchronization is achieved, and imaging processing and echo data acquisition and storage are carried out according to echo information of the target area; the receiver machine sends the real-time imaging result to the ground upper computer software for display through the data link;
the anti-interference processor performs interference cancellation on SAR images of multiple view angles of the same target area, performs matching recognition and target positioning on the target, and feeds back recognition and positioning results to the upper computer software for display;
two/more aircrafts simultaneously go out of the navigation point, the transmitter stops transmitting electromagnetic waves, and the receiver stops collecting echoes;
returning the aircraft;
after receiving SAR image data, the data transmission ground station displays SAR image information of a target area on the upper computer software in real time, verifies key technologies such as real-time imaging, time-frequency synchronization, spatial configuration and the like through information such as image resolution and the like, and the processor performs interference cancellation on SAR images of multiple view angles of the same target area, performs target matching recognition and positioning on cancellation results, feeds recognition and positioning results back to the upper computer software for display, and verifies key technologies such as interference resistance, recognition and positioning.
In step 1, a data transmission antenna is respectively installed on the back and the belly of a transmitter airborne system and a receiver airborne system, a follow-up GPS antenna and a front-end GPS antenna are respectively installed on the back of the transmitter airborne system and the back of the receiver airborne system, and a power supply, a distribution box, a data transmission baseband, a data transmission power amplifier and a processor are respectively installed in the cabin of the transmitter airborne system and the receiver airborne system.
The optional scheme comprises a step of airplane return, wherein after the step 3, two or more airplanes simultaneously go out of the navigation point, the transmitter onboard system stops transmitting electromagnetic waves, and the receiver onboard system stops echo acquisition.
Optionally, the ground system comprises an anti-interference processor, and the anti-interference processor is used for carrying out interference cancellation on SAR images of multiple view angles of the same target area, and carrying out target matching recognition and positioning on cancellation results.
The inventive functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In addition to the foregoing examples, those skilled in the art will recognize from the foregoing disclosure that other embodiments can be made and in which various features of the embodiments can be interchanged or substituted, and that such modifications and changes can be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (4)
1. An airborne distributed SAR outfield test method, comprising:
step 1, respectively installing a data transmission antenna on a transmitter airborne system and a receiver airborne system, respectively installing a follow-up GPS antenna and a front-end GPS antenna on the transmitter airborne system and the receiver airborne system, respectively installing a power supply, a distribution box, a data transmission baseband, a data transmission power amplifier and a processor on the transmitter airborne system and the receiver airborne system, and installing a phased array front end and inertial navigation equipment on the follow-up platform;
step 2, starting up a ground airport double-base or multi-base imaging system, and performing inertial navigation ground calibration after self-checking and time-frequency synchronization are completed;
step 3, after two or more aircrafts take off, designing according to an imaging configuration, planning to fly according to a preset track, and entering a navigation point;
step 4, after the aircraft enters the navigation point, the transmitter airborne system transmits electromagnetic waves to the target imaging area, the receiver airborne system acquires the position, the gesture and the beam pointing information of the transmitter airborne system through a data link, and the receiver airborne system calculates the relative position relation of the target area according to the position and the gesture information of the receiver airborne system, so that the beam pointing of the receiving antenna is adjusted, the space synchronization is achieved, and the imaging processing and the echo data acquisition and storage are carried out according to the echo information of the target area; the receiver-mounted system sends the real-time imaging result to the ground upper computer software for display through a data link;
and 5, after receiving SAR image data, the ground system displays SAR image information of a target area on the upper computer software in real time, verifies real-time imaging, time-frequency synchronization and spatial configuration through image resolution information, performs interference cancellation on SAR images of multiple view angles of the same target area, performs target matching recognition and positioning on cancellation results, and finally feeds back recognition and positioning results to the upper computer software for display, and verifies anti-interference and recognition positioning.
2. The method according to claim 1, wherein in step 1, a data transmission antenna is installed on the back and the belly of the transmitter and receiver systems, a following GPS antenna and a front GPS antenna are installed on the back of the transmitter and receiver systems, and a power supply, a distribution box, a data transmission baseband, a data transmission power amplifier and a processor are installed in the nacelle of the transmitter and receiver systems.
3. The method according to claim 1, wherein after step 3, the method includes a step of returning the aircraft, two or more aircraft go out of the navigation point at the same time, the transmitter onboard system stops transmitting electromagnetic waves, and the receiver onboard system stops collecting echoes.
4. The airborne distributed SAR outfield test method of claim 1, wherein in step 5, the ground system includes an anti-interference processor for performing interference cancellation on SAR images of multiple perspectives of the same target area, and performing target matching recognition and positioning on the cancellation result.
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| CN115173919B (en) * | 2022-05-27 | 2023-11-28 | 中国航空工业集团公司沈阳飞机设计研究所 | Air pull-apart test method for data chain of emission |
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