InSAR (interferometric synthetic aperture radar) imaging and altitude estimation method by iterative curved surface prediction

Abstract

The invention discloses an InSAR (interferometric synthetic aperture radar) imaging and altitude estimation method by iterative curved surface prediction. According to the InSAR imaging and altitude estimation method, raw echoed data of an InSAR are projected to a terrain altitude curved surface obtained from each iterative estimation to perform projection imaging by the aid of a back projection imaging algorithm so as to obtain an interferometric phase under the terrain altitude curved surface, high-altitude terrain inversion is performed by the aid of the interferometric phase, the terrain altitude curved surface is subjected to altitude compensation and multi-time iteration approximation, and the obtained terrain altitude curved surface is subjected to projection imaging and successive iteration approximation to estimate an actual terrain altitude, so that InSAR data imaging and altitude estimation integration is achieved, InSAR imaging and altitude estimation precision is improved, geometric distortion caused by terrain altitude variation is corrected, in other words, terrain geometric distortion is reduced, and a final InSAR imaging result and a final terrain altitude are obtained.

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 (InSAR) is an extension of Synthetic Aperture Radar (SAR) imaging technology. It mainly uses more than two SAR images obtained by observing the same observation scene at different angles or at different time periods by more than two antennas or multiple voyages. SAR image interferometric phase information, combined with the imaging geometric relationship to invert the terrain elevation information, thus realizing the remote sensing technology of high-precision terrain three-dimensional surveying and mapping. InSAR has the advantages of large imaging area, high imaging accuracy, and all-weather and all-weather imaging. It has become an important remote sensing technology for extracting large-area surface three-dimensional images and terrain elevatio...

AI Technical Summary

Problems solved by technology

However, the current back-projection algorithm is to project InSAR data onto the ground plane or radar range-azimuth plane for imaging. If the terrain has severe fluctuations, the geometric distortion of the terrain is serious when projecting imaging on the ground plane or radar range-azimuth plane.

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