Relative states autonomous determination of space non-cooperative target based on union of LSM and SRUKF

Quickly achieving relative states autonomous determination of space non-cooperative target is studied in this paper. Firstly, relative orbit motion states equation is established which is of high precision under condition of little distance; Secondly, united filtering algorithm of least square method and square root UKF filter is used to improve calculation precision and speed, in which least square method is used to estimate initial values and covariance matrix and then square root UKF filter achieving relative states autonomous determination of space non-cooperative target. Simulation results show the effectiveness of proposed algorithm, which could quickly achieve relative states autonomous determination.