Imaging method of ground moving target based on spaceborne SAR

Abstract

The invention belongs to the technical field of radar, relates to a spaceborne synthetic aperture radar (SAR) imaging method and discloses an efficient spaceborne SAR ground motion target imaging method which comprises the steps that (1) target original echo signals are converted to a two-dimensional frequency domain; (2) a distance matching filter is established in the two-dimensional frequency domain, and distance compressing and range migration correction are achieved through distance vector matching filtering; (3) signals after distance matching filtering are subjected to distance vector inverse Fourier transform, and the signals are converted into a distance Doppler domain; (4) an orientation matching filter is established at the distance Doppler domain, and orientation compressing is achieved by orientation vector matching filtering; and (5) signals after orientation matching filtering are subjected to orientation vector inverse Fourier transform, and imaging on a ground motion target is completed. Range migration correction is achieved at the two-dimensional frequency domain, interpolation is of no need, computing efficiency is high, the motion parameter and the position parameter of the target do not need to be known, and imaging on a plurality of targets can be carried out at the same time.

Description

technical field [0001] The invention belongs to the technical field of radar, and relates to a spaceborne synthetic aperture radar (Synthetic Aperture Radar, SAR) imaging method, in particular to a spaceborne SAR ground moving target imaging method, which is used for the spaceborne SAR to image a ground moving target. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR) is an all-weather, all-weather, multi-functional microwave remote sensing imaging device, which has been widely used in civil and military fields. Among them, ground moving target detection (Ground Moving Target Indication, GMTI) and ground moving target imaging (Ground Moving Target Imaging, GMTIm) of spaceborne SAR have become a research hotspot because of their important roles in traffic monitoring and battlefield reconnaissance. [0003] For the spaceborne SAR-GMTI system, the wide operating bandwidth and long coherent accumulation time enable it to perform high-resolution imaging of th...

AI Technical Summary

Problems solved by technology

However, this method needs to know the position parameters of the target, and the position parameters of the target in reality are often unknown

Therefore, the applicability of this method in practice is very limited

Furthermore, this method cannot simultaneously image multiple targets

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