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Assessment of EOS-04 (RISAT-1A) data calibration


Affiliations
1 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
2 Institute of Technology, Nirma University, Ahmedabad 382 481, India
3 National Remote Sensing Centre, Hyderabad 500 625, India

Radar imaging SATellite (RISAT-1A), also known as Earth observation satellite-04 (EOS-04), is a follow-on mission of India’s first indigenously developed spaceborne C-band synthetic aperture radar (SAR) on-board RISAT-1 satellite. This article provides a description of the post-launch calibration and data quality evaluation of EOS-04 launched on 14 February 2022. Calibration devices (corner reflectors) of different shapes and sizes were deployed at Ahmedabad and Amrapur calibration sites in Gujarat, India from 2 to 24 April 2022, and their response in the EOS-04 data was used to assess the radiometric and polarimetric calibration. The results of the analysis showed satisfactory radiometric and polarimetric data quality. Geolocation accuracy was assessed using the ground-surveyed position of the corner reflectors and was found to be in accordance with the specified values of less than 50 m

Keywords

Cross talk, EOS-04, geometric calibration, polarimetric calibration, radiometric calibration.
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  • Assessment of EOS-04 (RISAT-1A) data calibration

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Authors

Shweta Sharma
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Saurabh Tripathi
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
B. Sowkhya
Institute of Technology, Nirma University, Ahmedabad 382 481, India
Pragya Arora
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Shivani Tyagi
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
C. Sanid
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Ritesh Agrawal
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
K. N. Babu
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Raghav Mehra
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
V. M. Ramanujam
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
P. V. Jayasri
National Remote Sensing Centre, Hyderabad 500 625, India
Ameya A. Kesarkar
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Maneesha Gupta
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Kalpesh Kumar Borsadiya
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Vimalkumar Bhandari
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Puneet K. Agrawal
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Raksha Rai
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Partha Sarathi Nandy
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Deepak Putrevu
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Usha S. Ryali
National Remote Sensing Centre, Hyderabad 500 625, India
Ghanshyam Doshi
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
Parul R. Patel
Institute of Technology, Nirma University, Ahmedabad 382 481, India

Abstract


Radar imaging SATellite (RISAT-1A), also known as Earth observation satellite-04 (EOS-04), is a follow-on mission of India’s first indigenously developed spaceborne C-band synthetic aperture radar (SAR) on-board RISAT-1 satellite. This article provides a description of the post-launch calibration and data quality evaluation of EOS-04 launched on 14 February 2022. Calibration devices (corner reflectors) of different shapes and sizes were deployed at Ahmedabad and Amrapur calibration sites in Gujarat, India from 2 to 24 April 2022, and their response in the EOS-04 data was used to assess the radiometric and polarimetric calibration. The results of the analysis showed satisfactory radiometric and polarimetric data quality. Geolocation accuracy was assessed using the ground-surveyed position of the corner reflectors and was found to be in accordance with the specified values of less than 50 m

Keywords


Cross talk, EOS-04, geometric calibration, polarimetric calibration, radiometric calibration.



DOI: https://doi.org/10.18520/cs%2Fv126%2Fi9%2F1033-1040