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NASA/JPL AIRSAR Single Pass Polarimetric Interferometry: Data Processing and Calibration

The NASNJPL AIRSAR system was modified to collect the polarimetric interferometry data at C-band in 1998. S. R. Cloude and K. P. Papathanassiou first published the basic formulation of polarimetric interferometry. Polarimetric interferometry provides interferometric cross correlation information at various polarization states. Unlike repeat pass interferometric data, these single pass data do not suffer temporal decorrelation. In this paper, we discuss the data processing and calibration issues associated with polarimetric interferometry by using the AIRSAR data. Since the polarimetric interferometry data are collected in the polarimetric mode using the double baseline sequence, all data combinations must be co-registered precisely in the along track direction. Usual polarimetric S A R data have been recorded in the compressed Stokes matrix form; however, the polarimetric interferometric data must be recorded in the special form due to the complex correlation relationship. The final DEM (Digital Elevation Model) pixels must be carefully associated with the polarimetric interferometric images since various DEMs can be derived using different combinations of polarization states.