A Method of Interferometric SAR Data Imaging and Elevation Estimation

Abstract

The invention discloses an interferometric SAR data imaging and elevation estimation method, which is based on the back projection imaging theory, utilizes the corresponding relationship between the interferometric phase and the terrain elevation during the imaging process of the interferometric SAR back projection algorithm, and uses the imaging space terrain elevation The principle of the minimum interferometric phase obtained when the real terrain elevation is obtained, the terrain elevation corresponding to the minimum interferometric phase is found by the steepest descent method, and finally the interferometric SAR data is projected to the best imaging space terrain elevation estimated by the steepest descent method for imaging, so that The synchronous processing of interferometric SAR echo data imaging and elevation estimation is realized. Compared with the prior art, the invention reduces the distortion effect of the interferometric SAR image caused by the terrain elevation fluctuation, and improves the image quality of the interference SAR imaging and the estimation accuracy of the terrain elevation under the condition of the terrain elevation fluctuation.

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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