Stereo localization method for air-borne SAR image based on range equations

doi:10.7523/j.issn.2095-6134.2020.06.011

Abstract

Abstract: A method of stereo localization for airborne SAR image based on range equations is proposed. This method uses three SAR images of the same imaging area to implement stereo localization without control points. Firstly, the corresponding image points (CIP) in the three images are determined, and the platform parameters corresponding to the CIP such as instantaneous geographic coordinates, altitude, and slant range are analyzed. The range equations for the CIP of three images are established in the geocentric coordinate system. The geocentric coordinates of the CIP are obtained by solving range equations, the geographic coordinates and altitude are obtained by coordinate transformation, so as to realize the three-dimensional positioning. The system error factors affecting the accuracy of stereo localization are simulated and analyzed. The positioning experiment is carried out using the actual flight airborne SAR image. The results show that the proposed method is effective.

Key words: synthetic aperture radar(SAR), stereo localization, range-Doppler model, range equations

CLC Number:

TN958

PAN Zhigang, WANG Chao, CAO Ge. Stereo localization method for air-borne SAR image based on range equations[J]. , 2020, 37(6): 798-804.

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