Simulation And Analysis Of Multi-constellation Integrated Satellite Navigation System

Global navigation satellite system with the modernization of existing GPS, GLONASSsystem, and the development of BDS, Galileo system perfect, will bring new progress tomeasurement market in the future. Global navigation satellite system in the future willprovide users with more satellites and signals, in order to meet the needs of more and morehigh navigation and positioning.The face of ever increasing requirement of the user, thesmaller, lighter, faster and more environmentally friendly receiver will become the futuredirection of development. But for a growing number of satellite signals and coding, it requiresmore efficient processing technology. Based on this， some of the key issues aboutmulti-constellation integrated satellite navigation system is studied in this paper.First，different global satellite navigation system designed to be different, Throughsimulating the four navigation system, counting their the number of visible satellites underdifferent height cut-off angle in the four Chinese areas and global range, PDOP values andnavigation accuracy data, this paper analyzed their differences in navigation performance.Second，multi-constellation satellite navigation system positioning solver must first solvethe system of coordinates and time, decoding unified data must be in the same coordinate andtime system. Through the study of the four global navigation system coordinates and timesystem parameters, proposed a solution that unified coordinate system to the WGS-84coordinate system, unified a unified time system to the International Atomic Time.Third，in order to understand the performance of multi-constellation satellite navigationsystems. In this paper, different navigation satellite systems were combined, singleconstellations,dual,three,constellations,four constellations were simulated, Throughsimulation data, this paper analyzed their navigation performance under the cut-off angle atdifferent heights worldwide.Finally，an increase in the number of satellites increased the difficulty and speed of dataprocessing. This paper analysed the number of visible satellites on the premise of guaranteeprecision, and proposed an improved algorithm based on the traditional algorithm of satelliteselection, improved the speed of satellite selection greatly, and through simulations verifiedthe feasibility of the algorithm.