Imaging method with improved range migration algorithm (RMA) for high-resolution spaceborne synthetic aperture radar (SAR)

Abstract

In order to overcome the defect that a traditional range migration algorithm (RMA) cannot be directly applied to echo data processing of a high-resolution spaceborne synthetic aperture radar (SAR), the invention provides an imaging method with an improved RMA for the high-resolution spaceborne SAR, and belongs to the technical field of SAR imaging. Aiming at the problem of the high-resolution spaceborne SAR, the imaging method adopts a new slant range model to accurately model a curved track of the high-resolution spaceborne SAR; a two-dimensional frequency spectrum of echoes of the high-resolution spaceborne SAR is derived on the basis of the slant range model; and range migration correction, stolt interpolation and azimuth focusing of the traditional RMA are improved. By adopting the improved imaging algorithm, imaging process of the echoes of the high-resolution spaceborne SAR can be effectively completed.

Description

technical field [0001] The invention belongs to the technical field of synthetic aperture radar imaging, and relates to an imaging method of an improved range migration correction algorithm for high-resolution spaceborne SAR. Background technique [0002] Spaceborne Synthetic Aperture Radar (SAR) is an all-weather, all-time modern high-resolution microwave side-looking imaging radar, which comprehensively utilizes synthetic aperture technology, pulse compression technology and data processing technology, and can obtain Higher distance resolution and azimuth resolution are an advanced ground-to-earth telemetry technology in today's microwave field. With the continuous development and improvement of the spaceborne SAR system, it has increasingly shown strong advantages in scientific fields such as surveying and mapping, crop yield estimation, ocean and hydrological observation, environment and disaster monitoring, resource exploration, and military reconnaissance. play an inc...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the defect that the traditional RMA algorithm cannot be directly applied to the echo data processing of high-resolution spaceborne SAR, and proposes an imaging method for an improved range migration correction algorithm for high-resolution spaceborne SAR. The curved orbit of high-resolution spaceborne SAR is accurately modeled by the new slant range model, and on this basis, the two-dimensional spectrum of the high-resolution spaceborne SAR echo is derived, which improves the range migration of the traditional RMA algorithm. Motion correction, stolt interpolation and azimuth focusing, the improved imaging algorithm can effectively complete the imaging processing of high-resolution spaceborne SAR echoes

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