SAR图像相干斑噪声仿真

Question

SAR-like images are obtained by multiplying optical images by simulated white speckle in amplitude format (square-root intensity model) with pdfs corresponding to the cases of 1, 2, 4, and 16 looks.
有没有老哥知道这句话具体是怎么实现的嘛？就是在干净的图像上加相干斑噪声。