Bistatic forward-looking SAR image geometric correction method and device

Abstract

The invention provides a bistatic forward-looking SAR image geometric correction method and device based on a DSP and an FPGA. The method comprises the following steps: the DSP sends parameter data tothe FPGA; the FPGA is provided with a two-dimensional virtual matrix on the ground plane, and the FPGA is provided with k oblique ground pixel point corresponding relation calculation modules; k unprocessed pixel points and coordinates are extracted from the two-dimensional virtual matrix; the acquired coordinates of the unprocessed pixel points are simultaneously input into the oblique ground pixel point corresponding relation calculation modules, wherein each oblique ground pixel point corresponding relation calculation module processes the coordinate of one unprocessed pixel point; the calculation results of the oblique ground pixel point corresponding relation calculation modules of the FPGA are combined into an oblique ground projection conversion matrix; and the echo of the DSP completes range direction and azimuth direction processing, and after the image of the imaging oblique plane is obtained, the image of the imaging oblique plane is corrected into the image of the ground plane in combination with the oblique projection conversion 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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