基于HQBA的平移不变双基地SAR成像
doi: 10.3724/SP.J.1146.2008.00777
Image Formation of Translational-Invariant Bistatic SAR Based on HQBA
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摘要: 该文使用HQBA(Half Quasi-Bistatic Angle)的概念和驻定相位原理，推导平移不变双基地SAR点目标回波信号的二维精确频谱，深入分析频谱中各相位项的物理意义，提出基于HQBA计算的RD成像处理流程，并对平移不变双基地SAR的HQBA，RCM和成像效果进行仿真。结果表明，该方法能有效校正平移不变双基地SAR的距离单元徙动，提高成像质量。Abstract: By the method of stationary phase and the concept of HQBA (Half Quasi-Bistatic Angle), an exact two-dimensional spectrum of translational-invariant bistatic SAR is derived in this paper. Based on the analysis of every exponential term in the expanded spectrum, a flow chart of Range-Doppler algorithm with the computation of HQBA is proposed. Simulation results of HQBA, RCM and focused points are also provided. As they show, the proposed method can correct the RCM accurately, and improve the imaging quality.
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