论文部分内容阅读
为了准确估计合成孔径雷达(syn thetic apertureradar,SAR)高质量成像所必需的D opp ler中心,提出了一种解SAR D opp ler中心模糊的方法。利用SAR所固有的距离徙动(range m igration,RM)现象的性质,通过搜索使距离D opp ler域(range-D opp ler,R-D)信号强度对比度最小的D opp ler中心模糊数,就能实现解模糊。分析了该方法的性能。实验结果表明:与传统的SAR D opp ler中心解模糊方法相比,该方法既适用于城区高对比度场景,也适用于山地低对比度场景,并且由于无需做耗时的相关或快速Fourier变换运算以及只需部分距离单元参与运算,具有较高的计算效率。
In order to accurately estimate the Doppler center necessary for the high quality imaging of synchedtic aperture radars (SAR), a method to solve SAR Doppler center ambiguity is proposed. By exploiting the nature of the range m migration (RM) phenomenon inherent in the SAR, by searching for Doppler center fuzzy numbers that minimize the range-D opp ler signal intensity contrast, To achieve ambiguity. The performance of this method is analyzed. Experimental results show that compared with the traditional SAR Doppler center deconvolution method, this method is suitable for both high-contrast urban scenes and low-contrast mountain scenes. And because it does not need to do time-consuming or fast Fourier transform and Only part of the distance unit involved in computing, with high computational efficiency.