Deblurring Velocity Ambiguity of Distributed Space-Borne SAR Based on Chinese Remainder Theorem
Qi Wei-kong①②; Dang Ya-wen①; Yu Wei-dong①
①Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China; ②Graduate University of the Chinese Academy of Sciences, Beijing 100039, China
Abstract:When distributed Space-borne SAR measures the ground moving target velocity using along track interferometry, larger baseline leads to serious velocity ambiguity. On the basis of exploring robust Chinese remainder theorem, this paper analyzes the method of deblurring velocity ambiguity for multi-baseline and multi-frequency distributed Space-borne SAR, which uses the principle that remainder theorem determines the unique resolution on some conditions. Moreover, the constraints of multi-baseline and multi-frequency, and the maximum measurement velocity value are derived. The simulation results show that the algorithm is efficient for deblurring velocity ambiguity, play a guiding role and provides reference for system design and baseline design of distributed Space-borne SAR.