周期性非均匀采样实现星载SAR高分辨宽测绘带成像

High-resolution Wide-swath Imaging for Spaceborne SAR Based on Periodic Non-uniform Sampling

针对单通道星载SAR系统高分辨与宽测绘带之间的矛盾,该文提出了一种周期性非均匀采样的解决方法。该方法利用非均匀的方位采样,避开距离盲区的重叠,使得相同距离单元的盲区最多出现在一个采样通道内;然后利用方位采样的周期性,构造出等效的多通道数据,通过多通道解模糊的方法实现方位信号频谱恢复。文中还详细分析了非均匀采样的优化设计方法。最后仿真实验验证了该文方法的有效性。

In order to solve the contradiction between high-resolution and wide-swath for the spaceborne single-channel SAR system,this paper proposes a new method based on periodic non-uniform sampling.The method uses the non-uniform sampling to avoid the overlap of blind ranges,making the blind from the same range unit appears in one sampling channel mostly;The method uses the periodic sampling to construct the equivalent multi-channel data,and uses the multi-channel unambiguous reconstruction method to reconstruct the signal＇s spectrum.The paper also analyzes the optimal design of non-uniform sampling method in detail.Finally,simulation results verify the effectiveness of the method.