Calibration Method of Rang-variant Height Errors in High Resolution Airborne InSAR
HONG Jun①② ZENG Youbing①②③ WANG Yu①②
①(Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China) ②(National Key Laboratory of Microwave Imaging Technology, Beijing 100190, China) ③(University of Chinese Academy of Sciences, Beijing 100190, China)
High resolution airborne Interferometric Synthetic Aperture Radar (InSAR) is one of the important methods to generate high precision Digital Elevation Model (DEM). Due to the phase pattern difference between the two antennas, the interferometric phase bias varies with the range. The traditional interferometric calibration regards the phase bias as a constant, and it is not able to correct the range-variant phase errors. Therefore, there are range-variant errors of the reconstructed elevation. To solve this problem, this paper presents a calibration method that uses polynomial to fit the interference phase bias. At last, a set of real airborne InSAR data are used to validate the method, and the experimental results show that the proposed method can solve the problem of range-variant height errors in high resolution airborne InSAR effectively.
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