GNSS-based BiSAR imaging using modified range migration algorithm  

作　　者：ZENG Tao LIU FeiFeng ANTONIOU Michail CHERNIAKOV Mikhail 

机构地区：[1]Beijing Key Laboratory of Embedded Real-time Information Processing Technology,Beijing Institute of Technology [2]School of Electronic, Electrical and Systems Engineering, University of Birmingham

出　　处：《Science China(Information Sciences)》2015年第8期139-151,共13页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.61120106004,61225005,61427802);Chang Jiang Scholars Program(Grant No.T2012122);‘111’Project of China(Grant No.B14010);Beijing Higher Education Young Elite Teacher Project(Grant No.YETP1168)

摘　　要：This paper proposed a new focusing approach for the bistatic SAR systems with a GNSS （Global Navigation Satellite System） satellite as the transmitter. Because of the long integration time the inherited curvature of the transmitter＇s trajectory was adopted and the spatial variance of the equivalent velocity was derived under the principal of equivalent slant range model in the system signal model. The proposed focusing approach consists of two-step processing. Firstly, the general Doppler phase from constant velocity of the echo data is focused by modified Stolt mapping. Secondly, the residual nonlinear Doppler phase due to velocity variation is compensated by means of block-processing-based adaptive phase compensation to achieve large scene focusing. The simulation and experimental results validate the proposed algorithm in GNSS-based BiSAR systenls.This paper proposed a new focusing approach for the bistatic SAR systems with a GNSS （Global Navigation Satellite System） satellite as the transmitter. Because of the long integration time the inherited curvature of the transmitter＇s trajectory was adopted and the spatial variance of the equivalent velocity was derived under the principal of equivalent slant range model in the system signal model. The proposed focusing approach consists of two-step processing. Firstly, the general Doppler phase from constant velocity of the echo data is focused by modified Stolt mapping. Secondly, the residual nonlinear Doppler phase due to velocity variation is compensated by means of block-processing-based adaptive phase compensation to achieve large scene focusing. The simulation and experimental results validate the proposed algorithm in GNSS-based BiSAR systenls.

关 键 词：GNSS-based BiSAR equivalent slant range model curvature of trajectory two-step processing modified Stolt mapping 

分 类 号：TN96.1[电子电信—信号与信息处理]