Phase Difference Application in Fully PolSAR Images
(1) Institute of Radioengineering and Electronics, Fryazino, Moscow Region, Vvedensky sq., 141190, Fryazino, Shkolnaya, 7, 67, Russian Federation
The probability density function of each phase angle in complex PolSAR data, follow hypothesis of strong scattering regime, is uniformly distributed over [-pi, pi] and therefore does not contain any information about image terrain properties. But interchannel phase information: 1) co-pol phase (the phase difference between the co-polarised channels HH and VV), 2) cross-pol phase (the phase difference between the cross-polarised channels HH and HV, VV and VH), 3) the phase difference between HV and VH channels, are important in SAR polarimetric data along with the intensity. The area of its application in SAR polarimetric images includes the discrimination between dominant scattering situations, crop classification, moving target indication, oil spill observations, forest parameters estimation.
This paper represents a brief review of interchannel phase information application in PolSAR imagery, illustrated by images from SIR-C/X-SAR SLC C- and L-band fully polarimetric SAR data of Moscow region and Lake Baikal region, acquired in 1994/10/09, and proposes some new applications.
Speckle reduction is one of the main moments in the image interpretation improvement. But it is almost no difference between polarimetric phase difference not filtered or filtered by Lee polarimetric filter. It’s not the case for amplitude information in PolSAR images.