干涉SAR中相位图的噪声抑制

摘要

The phase noise suppression methods applied on the interferogram of interferometric synthetic aperture radar(INSAR) are studied.Multilook average approach(low pass linear filter) is discussed,and the new concept of range and azimuth critical look number used in multilook approach is proposed and its calculation formulas are deduced.The modified neighborhood field average filter,modified median filter and mode filter are analyzed,and a new practical method,which combines multilook average and nonlinear filter to reduce noise in the wrapped phase map,is presented.At the end of this paper,the characteristics of these approaches are compared and the experimental results by processing ERS-1/2 data are used to confirm that the method is more effective in suppressing noise in the interferogram of INSAR.%探讨干涉合成孔径雷达（INSAR）中干涉相位图的噪声抑制方法.在讨论多视平均法抑制噪声的基础上，提出了极限平均视数的概念，推导了极限平均视数的确定公式.在比较条件邻域平均、模糊中值滤波和模数滤波3种非线性噪声抑制方法的基础上，提出了一种结合多视平均和非线性滤波的干涉相位图噪声抑制实现方法，并用ERS-1/2数据的实际处理结果验证了方法的有效性.