Comprehensive Study on Despeckling of PolSAR ...

Comprehensive Study on Despeckling of PolSAR Images

Author Name : Ankit Malik, Mr. Sunil Dalal

Polarimetric synthetic aperture radar is an extension of Synthetic Aperture Radar (SAR) which is used to create 2D or 3D images in different polarization. It uses motion of radar antenna to the target object to get spatial properties better than other radars. PolSAR image is represented by a scattering matrix because it can send and receive in two polarizations that are horizontal and vertical. PolSAR led to many applications in disaster management, land cover mapping, forest mapping and agriculture. PolSAR is widely used in remote sensing applications. The main problem that arise after extraction of image is noise which degrades the quality of information that can be extracted from the image. This noise can be additive white Gaussian noise (AWGN) or granular multiplicative noise i.e. speckle noise. Performance of PolSAR is mainly affected by speckle noise. Speckle noise is a granular noise that inherently exists in PolSAR and degrades the quality of the active radar (SAR). Filtering techniques are commonly used to remove the effects of the speckle noise.