Inclination Angle Error Compensation Algorithm of MIMO Downward-looking Array SAR

doi:10.11947/j.AGCS.2018.20170292

Abstract

Abstract: Combined with the real POS data form, elements of exterior orientation of traditional optical photogrammetry were introduced, and inclination angle error compensation methods of MIMO downward-looking array SAR were designed.The beam-independent phase error was compensated in the three-dimensional spatial domain firstly.Then the compensated echo data was transformed into the two-dimensional wavenumber domain in along-track and cross-track directions, and was equally divided into M and N segments.The MN subblocks were zeroed and extended to the original size, transformed into the two-dimensional spatial domain in along-track and cross-track directions and wavenumber domain in range direction, and the beam-dependent phase error was compensated.Then, the subblock echo data were transformed into three-dimensional spatial domain, and added directly to the final data.Finally, the correct 3D imaging results could be obtained by 3D RD imaging algorithm.The effectiveness of the proposed method was verified by simulation experiments.

Key words: multi-input and multi-output, downward-looking array SAR, inclination angle, error compensation, elements of exterior orientation

CLC Number:

P237

LIU Hui, LI Geshuang, XU Qing, LOU Liangsheng. Inclination Angle Error Compensation Algorithm of MIMO Downward-looking Array SAR[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(7): 973-985.

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