A modified unscented Kalman filter for autonomous navigation of distributed satellite systems
Zhang Ai, Li Yong · 2017
k-order local weak observability is a indication of the observability of nonlinear system. In this paper, it is applied to describing the obserbability of autonomous navigation of a distributed satellite system with relative position measurement only. A modified unscented Kalman filter (UKF) is proposed to improve the accuracy of autonomous orbit determination for the two-satellite system. The navigation algorithm using this method for simultaneously estimating has been presented. It is demonstrated that compared with the general unscented Kalman filter, the modified unscented Kalman filter can raise the accuracy of the navigation system.