Instrument calibration architecture of Radar Imaging Satellite (RISAT-1)

T. Misra; R. Bhan; D. Putrevu; P. Mehrotra; P. S. Nandy; S. D. Shukla; C. V. N. Rao; D. B. Dave; N. M. Desai

doi:10.1117/12.2223709

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2 May 2016 Instrument calibration architecture of Radar Imaging Satellite (RISAT-1)

T. Misra, R. Bhan, D. Putrevu, P. Mehrotra, P. S. Nandy, S. D. Shukla, C. V. N. Rao, D. B. Dave, N. M. Desai

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Proceedings Volume 9881, Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV; 98811A (2016) https://doi.org/10.1117/12.2223709
Event: SPIE Asia-Pacific Remote Sensing, 2016, New Delhi, India

Abstract

Radar Imaging Satellite (RISAT-1) payload system is configured to perform self-calibration of transmit and receive paths before and after imaging sessions through a special instrument calibration technique. Instrument calibration architecture of RISAT-1 supported ground verification and validation of payload including active array antenna. During on-ground validation of 126 beams of active array antenna which needed precise calibration of boresight pointing, a unique method called "collimation coefficient error estimation" was utilized. This method of antenna calibration was supported by special hardware and software calibration architecture of RISAT-1. This paper concentrates on RISAT-1 hardware and software architecture which supports in-orbit and on-ground instrument calibration. Efforts are also put here to highlight use of special calibration scheme of RISAT-1 instrument to evaluate system response during ground verification and validation.

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T. Misra, R. Bhan, D. Putrevu, P. Mehrotra, P. S. Nandy, S. D. Shukla, C. V. N. Rao, D. B. Dave, and N. M. Desai "Instrument calibration architecture of Radar Imaging Satellite (RISAT-1)", Proc. SPIE 9881, Earth Observing Missions and Sensors: Development, Implementation, and Characterization IV, 98811A (2 May 2016); https://doi.org/10.1117/12.2223709

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