A New Approach of Satellite Selection for Multi-constellation Integrated Navigation System

Based on the analysis of relationship between the satellite elevation as well as the geometry dilution of precision (GDOP) and User-Equivalent Range Error (UERE), a new fast satellite selection algorithm applicable to GNSS receiver was presented with comprehensive considering satellite space geometric distribution and observation error on the result of positioning. In this algorithm, first, the simplified positioning precision evaluation function of elevation and the selecting satellites number model are built with the consideration of GDOP and UERE, through which the minimum elevation thresholds and the number of selecting satellites were quickly decided according to the precision of user's requirement. Then, the partition-weighted method is used to select all the satellites that are greater than the minimum elevation threshold. Parts of satellites are excluded through sorting, differentiating to fulfill satellite selection. Experiment results show that the algorithm has much lower complexity compared to the WPDOP algorithm, and the selection effect is better than the optimal PDOP algorithm.