DocumentCode :
126247
Title :
RISAT-1: Configuration and performance evaluation
Author :
Misra, Tapan ; Kirankumar, A.S.
Author_Institution :
Space Applic. Centre (ISRO), Ahmedabad, India
fYear :
2014
fDate :
16-23 Aug. 2014
Firstpage :
1
Lastpage :
4
Abstract :
Radar Imaging Satellite (RISAT-1) was launched on 26th April, 2012 and is available to international SAR community and researchers as a source of multi resolution/multi-swath/multi-polarisation SAR data. The first satellite, RISAT-1, carries a multi-mode Synthetic Aperture Radar (SAR) in C-band as the sole payload. RISAT-SAR payload supports variety of imaging modes e.g., stripmap, scanSAR and spotlight. All these imaging modes can be operated in Hybrid polarimetry mode also, making it the first of its kind. The payload is based on active antenna array technology. The active antenna has nominal aperture of 6 m×2m, consisting of 12 tiles which are grouped into 3 panels. The RISAT-1 spacecraft has been built around the SAR payload in order to optimise the spacecraft weight and structure. The satellite is placed in a sun-synchronous orbit with 6 am-6 pm equatorial crossing, to maximize solar power availability. Initial performance assessment indicates very satisfactory performance of the SAR system of RISAT-1 in terms of image quality, calibration, geometric fidelity and consistent product performance and active antenna pattern synthesis. Already from September 2012, data products are available operationally from National Remote Sensing Centre, Hyderabad.
Keywords :
active antenna arrays; radar polarimetry; remote sensing by radar; spaceborne radar; synthetic aperture radar; 6 am-6 pm equatorial crossing; AD 2012 04 26; AD 2012 09; C-band; Hyderabad; National Remote Sensing Centre; RISAT-1 configuration; RISAT-SAR payload; Radar Imaging Satellite; active antenna array technology; active antenna pattern synthesis; calibration; consistent product performance; geometric fidelity; hybrid polarimetry mode; image quality; imaging modes; international SAR community; multimode Synthetic Aperture Radar; multipolarisation SAR data; multiresolution SAR data; multiswath SAR data; performance evaluation; scanSAR; solar power availability; spacecraft weight; spotlight; stripmap; structure; sun-synchronous orbit; Antenna measurements; Extraterrestrial measurements; Image resolution; Orbits; Payloads; Satellites; Synthetic aperture radar;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
General Assembly and Scientific Symposium (URSI GASS), 2014 XXXIth URSI
Conference_Location :
Beijing
Type :
conf
DOI :
10.1109/URSIGASS.2014.6929612
Filename :
6929612
Link To Document :
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