A SATELLITE SELECTION ALGORITHM FOR GNSS MULTI-SYSTEM BASED ON PSEUDORANGE MEASUREMENT ACCURACY

摘要

The available satellites in Global Navigation Satellite System (GNSS) are much more than single positioning system. The satellite selection algorithm is needed to reduce the computation of hardware in GNSS receiver. The positioning accuracy is proportional to the geometric dilution of precision (GDOP) which is determined by the positions of available satellites and receiver in the single positioning system. However, GDOP is not the only factor affect positioning accuracy in the multi-system because of the different pseudorange measurement accuracy (UERE) of each system. The items of GDOP were introduced in this paper at first. Then, the relationship between the positioning error and UERE was analyzed amply. And a satellite selection algorithm for GNSS multi-system based on UERE was proposed in this paper at last. The GDOP was weighted by UEREs of each system and selected the satellite according to the new weighted GDOP. The simulation results showed the effectiveness of the algorithm.