调频连续波SAR信号分析与成像研究
doi: 10.3724/SP.J.1146.2007.00578
The Analysis of FMCW SAR Signal and Image Study
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摘要: 镇对调频连续波SAR与脉冲式SAR工作体制的不同，从而带来不同的回波表现形式，该文对调频连续波SAR回波信号进行了建模，分析了信号的特征，揭示了平台的连续运动在距离向产生一个多普勒频移的特性，将去斜接收体制固有的残余视频相位分离成卷积的形式，并在频域完成补偿，给出了适宜于连续波SAR成像处理的改进频率变标算法，相对于原有的频率变标算法，几乎没有增加额外的运算量。最后通过点目标仿真验证了该文分析的正确性和所提算法的有效性。Abstract: Based on the difference of work mechanism between Frequency Modulated Continuous Wave (FMCW) Synthetic Aperture Radar (SAR) and Pulse Synthetic Aperture Radar, which leads to different form of received signal, this paper establishes the model of FMCW SAR echo, analyzes its characteristics, and reveals the Doppler frequency shift effect in range direction induced by the continuous motion while radar transmitting and receiving signal. The Residual Video Phase (RVP), inherent to Dechirp-on-receive system, is represented in the form of convolution and compensated for in the frequency domain. Also Modified Frequency Scaling Algorithm is presented. Compared to the conventional method, it almost adds no additional computation load. Finally, point target simulation validates the correctness and the effectiveness of the presented method.
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