Rapid time-domain imaging method suitable for circular synthetic aperture radar

Abstract

The invention provides a rapid time-domain imaging method suitable for a circular synthetic aperture radar. The whole process of the method comprises three processing steps of 1 subaperture partition and initial subimage generation, 2 circular recursion subaperture merging and subimage generation and 3 full aperture merging and final image generation. The rapid time-domain imaging method suitable for the circular synthetic aperture radar has the advantages that a subaperture processing technology is adopted, the calculated amount of the time-domain imaging method is greatly reduced at the time of keeping the high precision of the time-domain imaging method, therefore, the imaging processing efficiency is improved, rapid and high-precision imaging process of the CSAR is achieved, and a high-quality CSAR image is obtained.

Description

technical field [0001] The invention belongs to the field of synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging, and relates to a fast time-domain imaging method suitable for circular synthetic aperture radar (Circular SAR, CSAR). Background technique [0002] CSAR refers to a radar system in which the radar platform (or radar station) moves in a 360° circle or a wide-angle arc around the observation scene, and the beam always points to the target scene for observation and imaging; this radar system has the ability to obtain target scattering information, high The advantages of high-resolution imaging and the ability to realize three-dimensional imaging have attracted widespread attention in recent years; however, the special motion trajectory has brought new problems and challenges to CSAR data processing, such as the large amount of echo data and the coupling of echo distance and azimuth. These have greatly increased the difficulty of CSAR high-precision imag...

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Problems solved by technology

[0002] CSAR refers to a radar system in which the radar platform (or radar station) moves in a 360° circle or a wide-angle arc around the observation scene, and the beam always points to the target scene for observation and imaging; this radar system has the ability to obtain target scattering information, high The advantages of high-resolution imaging and the ability to realize three-dimensional imaging have attracted widespread attention in recent years; however, the special motion trajectory has brought new problems and challenges to CSAR data processing, such as the large amount of echo data, the coupling of echo distance and azimuth These have greatly increased the difficulty of CSAR high-precision imaging processing

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