陸域観測技術衛星（ALOS）の高周波姿勢決定：軌道上評価

摘要

Satellite attitude micro-vibration caused by disturbances such as reaction wheels, inter-satellite antenna and movable mission sensors degrades quality of the Earth observation images. For the Advanced Land Observing Satellite (ALOS), wide-bandwidth angular displacement sensor (ADS) which measures the micro-vibration is installed, and the High-Bandwidth Attitude Determination System (HAD), which incorporates the ADS data and conventional Precision Attitude Determination System(PAD) based on a star tracker and an inertial reference unit, is developed for image quality improvement. The analyses of the on-orbit ADS data, however, revealed the differential attitude motion between the mission sensor (PRISM) and ADS due to their non-collocation on the satellite. In this paper, the differential motion between the PRISM and ADS, and a geometrical image correction scheme accounting for the differential motions are described.