Stellar Imaging Operations in Cartosat- 2A

摘要

Radiometric calibration of optical pay load in remote sensing satellites has traditionally been accomplished by means of ground calibration techniques. Cartosat-2 series of satellites has the capability to maneuver to any orientation such that celestial scenes can be imaged. Such capabilities of spacecraft systems are thoroughly exploited to have stellar scannings and hence obtain Point Spread Function (PSF) in order to characterize the onboard optical system. The spacecraft was maneuvered to image the stars in such a way to obtain PSF over the entire field of view (FOV) of the optical system for many times. The most probable PSF has been applied on the earth's imageries to enhance the image quality. These satellites were also made to scan the moon to provide radiometric calibration.