System modeling in data processing of Taiji-1 mission

Taiji-1 is the first technology demonstration satellite of Taiji Program in Space, which, served as pre-PathFinder mission, had finished its nominal science operational phase and successfully accomplished mission goal. The gravitational reference sensor (GRS) on-board one key payloads that coupled strongly to other instruments, sub-systems also platform itself. Fluctuations physical environment inside mechanical disturbances generate important noises GRS measurements, therefore their data can be used evaluate performance [Formula: see text]-thrusters stability platform. In this work, we report on methods employed processing systematical modelings spacecraft orbit attitude perturbations, disturbances, internal changes. modeled are then removed carefully from improve quality in-orbit estimations.