ADEOS-2 (MIDORI-2), the successor of ADEOS is a 4 ton class large Earth observation platform satellite. In the attitude determination system of ADEOS-2, the GPSR and the pitch axis of Fine Sun Sensor (FSSA) are added to the conventional attitude determination system of ADEOS. This new attitude determination system has improved the accuracy because the pitch attitude is determined by FSSA, which can be realized by the GPSR. In addition, the seasonal correction law of the Earth radiance error of Earth Sensor (ESA) was applied, and this correction improves the roll attitude. The ground evaluation and validation of the attitude were executed using the telemetry data of attitude and orbit control subsystem (AOCS) sensors and the star sensor which is loaded independently of AOCS as experimental device, and it is verified that the satisfactory attitude has been maintained during ten months.
In flight evaluation results of the attitude determination system of ADEOS-2
