Method and device for geometric correction of double-base forward-looking SAR images

Abstract

The present invention provides a dual-base forward-looking SAR image geometric correction method and device based on DSP and FPGA. The method includes: DSP sends parameter data to FPGA; FPGA arranges a two-dimensional virtual matrix on the ground plane, and FPGA has Calculation module for k oblique pixel point correspondences; take k unprocessed pixel points and coordinates from the two-dimensional virtual matrix; simultaneously input the acquired coordinates of the unprocessed pixel points into the oblique ground pixel point correspondence relationship Calculation module, each oblique pixel point correspondence calculation module processes the coordinates of an unprocessed pixel point; the calculation results of each oblique pixel point correspondence calculation module of the FPGA are combined into an oblique projection conversion matrix; DSP After the echo is processed in the range direction and the azimuth direction, and the image of the imaging oblique plane is obtained, the image of the imaging oblique plane is corrected into an image of the ground plane in combination with the oblique projection transformation matrix.

Description

technical field [0001] The invention relates to the field of radar imaging processing, in particular to a DSP- and FPGA-based dual-base forward-looking SAR image geometric correction method and device. Background technique [0002] Since the advent of Synthetic Aperture Radar (SAR) as a remote sensing detection system in the 1950s, SAR has always attracted the attention of experts in various fields at home and abroad with its unique all-time, all-weather, and working capabilities. Attention, SAR has developed rapidly. The advantage of bistatic forward-looking SAR is that it can perform forward-looking imaging. Bistatic forward-looking SAR has a separate launch platform and receiving platform. It has very good application prospects in matching guidance and other fields. [0003] However, the echo processing of bistatic forward-looking SAR is limited by the current industrial level of integrated circuits and the theoretical level of imaging algorithms. Currently, frequency-d...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present invention proposes a method and device for geometric correction of bibase forward-looking SAR images based on DSP and FPGA. The problem of long calculation time and large amount of calculation

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