Abstract:

Aiming at the problem of location and tracking non-cooperative low orbit target in two satellites case, an location and tracking algorithm based on the Newton iteration and extended Kalman filter (N-EKF) is proposed. Firstly, the double satellite observation model based on angle measurement information is transformed into two straight lines perpendicular midpoint problem, which is further transformed into non-linear equations problem. The Newton iterative algorithm is used to calculate the initial location information of the non-cooperative target. Then, based on initial positioning information, extended Kalman filter (EKF) and the near-earth orbit dynamic model are used to achieve the precise tracking filter of the non-cooperative in-orbit target. Finally, simulation result verifies the feasibility and advantages of the proposed method.

Key words: double satellite, borderless location, non-cooperative low orbit target, tracking