CSG QUAD-POLARISATION DATA ASSESSMENT FOR POLARIMETRIC CALIBRATION

Abstract

High-resolution quad-polarisation X-band data are currently available from COSMO-SkyMed Second Generation (CSG) satellites. This paper presents a preliminary assessment on the CSG quad-polarisation data for polarimetric calibration. Both trihedral and dihedral corner reflectors were deployed simultaneously during the CSG data acquisition over Singapore in April and May 2023. From the point target analysis, the phase difference between HH and VV was found to be deviated often from the theoretical value. On the other hand, the average values of crosstalk parameters were below −30 decibel (dB), indicating a good isolation of the CSG SSAR1 antenna. After applying the polarimetric calibration, the polarisation signatures of the trihedral corner reflectors were restored appearing close to the theoretical response.