Navigation Method for Terrestrial Users Based on Beidou Ka Inter-Satellite Links.

The L-band navigation signals are easily affected by the intentional or unintentional interference and spoofing, which may lead to the regional performance degradation or even failure of the navigation system. This paper presents a new navigation approach for the terrestrial users based on Beidou Ka inter-satellite links. Firstly, the feasibility of the approach is ascertained and the measurement model under time division system is given; Then, an epoch reduction method for the Ka measurements is proposed using the receiver clock model and the measurements from the inertial navigation system, based on which the Beidou Ka inter-satellite link based real time navigation algorithm for the terrestrial users is derived; Finally, the influence of different factors on the performance of the algorithm is analyzed by the numerical simulations. The simulation results show that the proposed algorithm can achieve a satisfactory position precision within 2.0 meters, which can compensate for the lack of the regional failure of the L-band navigation signals to a certain extent. [ABSTRACT FROM AUTHOR]