A method and device for range migration correction of synthetic aperture radar echo data

Abstract

The invention discloses a synthetic aperture radar (SAR) echo data range cell migration (RCM) correction method and device. The method includes the following steps that: range compression and geometric RCM correction are performed on echo data, so that post-range compression time-domain data are obtained; sub aperture segmentation is performed on the post-range compression time-domain data, so that sub aperture data can be obtained, and sub block data with a highest signal-to-noise ratio (SCR) in the sub aperture data are selected; the residual RCM of the sub aperture data are determined according to the selected sub block data; full aperture combination is performed on the residual RCM of the sub aperture data, so that the full-aperture combination of the residual RCM can be obtained; the residual RCM of the echo data is corrected according to the full-aperture combination of the residual RCM; and the echo data of which the residual RCM has been corrected are adopted to perform imaging. The invention also discloses a synthetic aperture radar (SAR) echo data range cell migration (RCM) correction device.

Description

technical field [0001] The invention relates to an echo signal correction technology of Synthetic Aperture Radar (SAR, Synthetic Aperture Radar), in particular to a method and device for SAR echo data Range Cell Migration (RCM, Range Cell Migration) correction. Background technique [0002] SAR has the ability to perform high-resolution imaging all day, all weather, and plays an important role in the field of remote sensing. However, in the airborne SAR system, the motion error mainly caused by the deviation of the trajectory of the airborne aircraft will cause the range delay and Azimuth Phase Errors (APE) of the received raw data, which will seriously reduce the quality of the image. In the light and small airborne very high resolution (VHR, Very High Resolution) SAR system, the problem caused by the motion error is more serious: on the one hand, due to the light weight and small size, the light and small airborne SAR system is more likely to be affected by The interferen...

AI Technical Summary

Problems solved by technology

However, the above self-focusing method only considers the APE and ignores the residual RCM; however, for light and small airborne VHR SAR sensors, the residual RCM is inevitable and must be estimated and compensated, otherwise a well-focused high-resolution image cannot be obtained. Quality SAR Imagery

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