提高INSAR干涉图质量的过采样方法

在对干涉图中频谱混叠噪声的成因及其影响进行深入分析的基础上,研究通过对原始影像频谱进行过采样来消除频谱混叠的方法;同时为了将过采样后的干涉图恢复到原始影像大小,又探讨了干涉图的欠采样理论,并推导出加权欠采样函数。实验结果表明,文中的过采样加权欠采样方法能有效消除干涉图中的频谱混叠噪声,经欠采样处理后的干涉图条纹边缘更加清晰,残余点数较原始干涉图减少90%以上。

A Oversampling Method for INSAR Interfermetory Quality Improving

Based on analysis of the sources and influence of spectrum aliasing in the interferogram,The oversampling is used to remove the aliasing.In order to reduce the interfermetory,the downsampling method is studied,and the downsampling weighting function is deduced.Test results show that the oversamplingweighting downsampling method can effectively remove the spectrum aliasing noise.After the downsampling process the edge of the strip is more distinct than that of original interfermogram,and the number of residues is reduced more than 90%.