星载多通道SAR的模糊特性研究

摘要

为解决星载SAR的高分辨率和宽测绘带之间存在的矛盾，引入了多通道模式。基于多通道SAR的工作原理，深入分析了多通道SAR模糊信号的来源；从子带滤波和多通道重构的角度，提出多通道SAR的方位模糊计算方法，最后给出了仿真实例。仿真结果表明，该方法能够有效应用于星载多通道SAR设计中，指导选择合适的脉冲重复频率，以降低方位模糊和距离模糊。%For overcoming a contradiction between the high resolution of spaceborne SAR and wide-swath, the mode of multi-channel is brought about. This paper goes deeply into the origination of the blurred signals in multi-channel SAR, based on the operating principles of multi-channel SAR, and presents the fuzzy computation of multi-channel SAR azimuth, and finally gives the examples of simulation. Simulation results show that this method can be effectively applied to the design of spaceborne multi-channel SAR, guiding to select the proper pulse repetitive frequency for reducing the fuzzyness of azimuth and range.