Method and device for calculating spatial synchronization angle of high-precision beamforming bi-base SAR
An angle calculation and high-precision technology, which is applied in the field of high-precision spotlight bistatic SAR space synchronization angle calculation, can solve the problems of slow calculation speed, low calculation precision, and poor accuracy, and achieve the effect of high precision and fast data calculation
Active Publication Date: 2022-02-08
成都汇蓉国科微系统技术有限公司
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[0005] In order to solve the above-mentioned technical problems, the present invention proposes a Zynq-based method and device for calculating the space synchronization angle of high-precision spotlight bistatic SAR. When calculating the base SAR space synchronization angle, the calculation accuracy is low, the accuracy is poor, and the calculation speed is slow
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[0108] Zynq is a high-end chip launched by Xilinx that integrates an ARM-Cortex-A9 dual-core (Processing System, PS) and a programmable logic unit (Programmable Logic, PL) with up to more than 5 million logic gates. Inside the chip, the Zynq PS unit and the Zynq PL unit are interconnected through a high-speed interface based on the axi protocol. The Zynq PS unit is essentially an arm processing unit, which contains rich peripheral interfaces, such as spi, uart, Internet, etc. The programming implementation of Zynq PS is similar to that of ordinary arm processors, for example, it is programmed in c language and executed by instruction code strings. The Zynq PS unit can perform double-precision floating-point operations, and has high enough numerical calculation precision. The Zynq PL unit is essentially an FPGA logic processing unit with common FPGA internal resources. The Zynq PL unit has sufficiently high speed when executing algorithms.
[0109] combine first Figure 1-2...
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The invention provides a Zynq-based method and device for calculating the space synchronization angle of high-precision spotlight bistatic SAR. The method includes: recording the GPS coordinates of the center of the target area of high-precision spotlight bistatic SAR imaging, and acquiring motion in real time. The current GPS coordinates of the platform; combined with the earth model parameters, the Zynq PS unit converts the GPS coordinates of the center of the target area in the GPS coordinate system and the current GPS coordinates of the motion platform into the center coordinates of the target area and the coordinates of the motion platform in the earth-centered and ground-fixed coordinate system; Zynq The PL unit combines the center coordinates of the target area and the coordinates of the moving platform in the earth-centered and ground-fixed coordinate system with the space synchronization algorithm to calculate the off-axis angle factor and rotation angle factor of the phased array antenna; the Zynq PS unit calls the C language mathematical function library to calculate result. According to the solution of the present invention, it is ensured that the precision of the calculation result is high enough and the data calculation is fast enough.
Description
technical field [0001] The invention relates to the field of radar imaging processing, in particular to a Zynq-based method and device for calculating the space synchronization angle of a high-precision spotlight bistatic SAR. Background technique [0002] The bistatic synthetic aperture radar system can achieve high-resolution imaging of the forward-looking area of the receiving platform through the separate transceiver platform, and because of its separate transceiver architecture, this type of radar system has good anti-jamming performance, The system configuration of far and close can obtain the advantages of strong concealment and good anti-interception, which is a research hotspot in the current radar field. It has good application prospects in the fields of early matching guidance and autonomous landing. [0003] The two moving platforms of the bistatic SAR are located separately. Usually, the transmitting platform squints at the target area, and the receiving plat...
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IPC IPC(8): G01S13/90G01S7/41
CPCG01S13/9058G01S13/9094G01S7/418
Inventor 胥秋石韦伟冷立根王飞汪宗福杨为华孙南
Owner 成都汇蓉国科微系统技术有限公司