Correction of Transmit Crosstalk in Reconstruction of Quad-Pol Data From Compact Polarimetry Data

A compact polarimetric (CP) synthetic aperture radar (SAR) has an advantage of reconstructing quad-polarimetric (quad-pol) information from measured dual-polarized scattering vectors. In order to fully explore CP data, calibration of CP measurements is important. However, among different system errors, the crosstalk on transmit is not possible to be corrected in measured scattering vectors even when it is already estimated and known. Except scattering vectors, reconstructed quad-pol data are widely used. Three reconstruction algorithms have been published in the literature: one by Souyris et al., a refined algorithm by Nord, and another refined one by Collins et al. However, the removal of transmit crosstalk is still left unresolved. In this letter, we proposed a calibration algorithm to correct the transmit crosstalk in reconstructions of quad-pol data from CP data. We conducted simulations with fully polarimetric Advanced Land Observing Satellite Phased Array L-band SAR data. Simulation results confirmed that the algorithm performed effectively and stably under certain conditions.