Orbiter High Resolution Camera onboard Chandrayaan-2 Orbiter
Arup Roy Chowdhury, Manish Saxena, Ankush Kumar, S. R. Joshi, Amitabh Amitabh, A. Dagar, Manish Mittal, Shweta Kirkire, Jalshri Desai, Dhrupesh Shah, J. C. Karelia, Anand Kumar, Kailash Jha, Prasanta Kumar Das, H. V. Bhagat, Jitendra Sharma, D. N. Ghonia, Meghal A. Desai, G.D. Bansal, Ashutosh Gupta
Abstract
Chandrayaan-2 Orbiter-craft, is a very high spatial resolution camera operating in visible panchromatic band. OHRC's primary goal is to image the landingsite region prior to landing for characterization and finding hazard-free zones. Post landing operation of the OHRC will be for scientific studies of small-scale features on the lunar surface. OHRC makes use of the time delay integration detector to have good signal-tonoise ratio under low illumination condition and less integration time due to very high spatial resolution. Ground sampling distance (GSD) and swath of OHRC (in nadir view) are 0.25 m and 3 km respectively, from 100 km altitude. GSD is better than 0.32 m in oblique view (25 pitch angle) during landing site imaging from 100 km altitude in two stereo views in consecutive orbits. This article includes the details of the configuration, sub-systems, imaging modes, and optical, spectral and radiometric characterization performance.