Synchronous with RISAT-1 and RADARSAT-2 passes, corner reflectors (CR) were mounted for the evaluation of radiometric calibration of RISAT-1 compact polarimetric SAR data. Based on the CRs response on SLC images, RISAT-1 calibration constant, PSLR/ISLR, resolution, channel imbalance and cross-talk were analyzed and compared with that of product specifications. A difference of 0.5 to 1.5 dB is observed between product and estimated calibration constant K. The resolution and PSLR/ISLR are better than the specification of the product. Backscattering coefficient and compact polarimetric parameters of RISAT-1 were compared with RADARSAT-2 simulated compact polarization. The large difference in sigma-0 is observed for water and sand features due to high value of noise-equivalent-sigma-zero of RISAT-1. Similarly, some differences are observed between RISAT-1 estimated compact polarimetric parameters (m, mc, δ, χ, axial ratio, CPR) and that of RADARSAT-2 simulated compact data.
[1]
Anthony Freeman,et al.
Compact Polarimetry at longer wavelengths - calibration
,
2008
.
[2]
David E. Smith,et al.
Lunar Reconnaissance Orbiter Overview: The Instrument Suite and Mission
,
2007
.
[3]
Shaun Quegan,et al.
Calibration of Spaceborne CTLR Compact Polarimetric Low-Frequency SAR Using Mixed Radar Calibrators
,
2011,
IEEE Transactions on Geoscience and Remote Sensing.
[4]
A Oy,et al.
Synthetic Aperture Radar Calibration Using Reference Reflectors
,
1990
.
[5]
R. Keith Raney,et al.
Dual-polarized SAR and Stokes parameters
,
2006,
IEEE Geoscience and Remote Sensing Letters.
[6]
M. Annadurai,et al.
Chandrayaan-1: India's first planetary science mission to the moon
,
2009
.
[7]
Ridha Touzi,et al.
Requirements on the calibration of Hybrid-Compact SAR
,
2014,
2014 IEEE Geoscience and Remote Sensing Symposium.