New methods of the filtering the phase noise in the interferometric SAR
Because of the existence of the noise in the fringe, it influences the computing efficiency and precision of the algorithms of the unwrapping, and then influences the precision of the generation of digital elevation models. This paper firstly analyzes the sources of the phase noise in the fringe. Then introduces several methods used to filter the phase noise in the fringe. For the phase jump in the fringe, it proposes a method of sine & cosine transformation to solve the problem of phase jump. At the basic of the method of sine & cosine transformation, it puts forward two new methods - sine & cosine mean filter (SCMeanF) and sine & cosine median filter (SCMedianF). Lastly, we carried out the contrast test.