Space Relative Navigation Filter Based On-Board Radar Observation

The absolute attitude error of chaser vehicle is always neglected in observation equation of space relative navigation filter when chaser satellite on-board radar using as the measurement sensor. But the attitude error could affect relative navigation filter precision in fact. The new observation equation, which contains the absolute attitude error of chaser vehicle, is constructed. And the plan, using equivalent measurement error as attitude error, is put forward. The simulations show that the filter precision of relative position and velocity descend when attitude error is big, and the precision is improved when attitude equivalent error is introduced to filter. The plan of attitude equivalent error is proved to be feasible.