Interference SAR data imaging and elevation estimation method

Abstract

The invention discloses an interference SAR data imaging and elevation estimation method. On the basis of the back-projection imaging theory, by adopting the corresponding relation between interferometric phase and terrain elevation in the interference SAR back-projection algorithm imaging process, and by using the principle that the minimum interferometric phase is obtained when the imaging space terrain elevation is the real terrain elevation, the terrain elevation corresponding to the minimum interferometric phase is found by the steepest descent method, and interference SAR data is projected to the optimal imaging space terrain elevation which is estimated and obtained by the steepest descent method, for the purpose of imaging. In this way, synchronous processing of interference SAR echo data imaging and elevation estimation is realized. Compared with the prior art, the invention reduces interference SAR image distortion effect which may be caused due to terrain elevation fluctuation, and improves the interference SAR imaging image quality and the terrain elevation estimation precision under the condition of fluctuating terrain elevation.

Description

technical field [0001] The invention belongs to the field of radar technology, in particular to the field of synthetic aperture radar (SAR) imaging technology. Background technique [0002] Interferometric Synthetic Aperture Radar (Interferometric SAR) is an extension of Synthetic Aperture Radar (SAR) imaging technology, which mainly uses two or more SAR images obtained by observing the same observation scene at different angles or at different time periods by using more than two antennas or multiple voyages. , extract the SAR image interferometric phase information, and then combine the imaging geometric relationship to invert the terrain elevation information, so as to realize the remote sensing technology of high-precision terrain three-dimensional mapping. Interferometric SAR has the advantages of large imaging area, high imaging accuracy, and all-weather and all-time imaging. It has become an important remote sensing technology for extracting large-area surface three-di...

AI Technical Summary

Problems solved by technology

However, in the process of interferometric SAR imaging data processing, the current back-projection imaging algorithm only realizes partial synchronous processing of interferometric SAR echo data imaging and interferometric phase extraction, and its data imaging process and elevation estimation process are still independent of each other, so There are still problems with the separation of imaging and elevation estimation in traditional interferometric SAR data processing, and it is difficult to perform interferometric SAR high-precision elevation estimation, geometric correction, etc.

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