Phase difference statistical behavior of interferometric SAR systems

The knowledge of the detailed structure of the scatterer using synthetic aperture radar (SAR) can only be possible if a complete description of the scene was available, which is impossible in practice. Therefore, it is necessary to average data to obtain estimates of useful precision. The statistical description presents a great interest since it allows predicting signal behavior. This paper deals with the statistical behavior of the phase difference between two interferometric signals. The probability density function is examined stating its dependence on the coherence and the mean of the phase difference.