Speckle Reduction in SAR Imagery by Various Multi-Look Techniques

摘要

SAR images are contaminated by speckle noise. Multi-look imaging is used for its alleviation. In this report, we discuss the performance of several techniques to generate multi-look images. It is shown that the geometric resolution of the impulse response can be traded for the radiometric resolution. The various techniques differ in the use of single looks, number, size and weighting function. It is found that by properly positioning of overlapping looks in the spectral domain, the equivalent number of looks is substantially higher than the number of independent looks.