ScanSAR成像及测绘带拼接像素间隔的归一化

ScanSAR imaging and pixel spacing normalizing in combination

针对扫描模式合成孔径雷达(ScanSAR)的成像拼接处理中存在的像素间隔不一致的问题,分析比较了几种成像算法的像素间隔以及由此引起的拼接错位。改进的SPECAN(spectral analysis)算法能够对子图像内部的方位像素间隔进行归一化,但是没有考虑子图像之间的归一化。给出了对子图像内与子图像间像素间隔归一化的方法,通过设置恰当的参考斜距能够实现整个测绘带像素间隔的统一。仿真和处理结果表明可以获得很好的拼接效果。

To deal with the problem of pixel spacing in the result of scanning mode synthetic aperture radar imaging, several algorithms about ScanSAR imaging are compared with respect to their pixel spacing and the mismatch in subswath combination. The modified SPECAN （,spectral analysis） algorithm can normalize the azi- muth pixel spacing in inner-burst but the normalization of inter-bursts is not under consideration. A method is given to normalize both of the azimuth pixel spacing by setting the referrence range properly. To demon,strate the improvement for subswath combining, the simulation and processing results are presented.