GNSS多星定位数据的质量分析

A Quality Analysis of GNSS Satellite Positioning Data

重点对北斗卫星(BDS)、双星(GPS/GLONASS)和多星(BDS/GPS/GLONASS)定位数据的多路径效应、电离层延迟、数据利用率与信噪比、卫星可见数和精度因子PDOP值等几个方面进行比较分析.试验分析表明:多星融合的平均mp1和mp2相比BDS单系统分别减小了18%和8%,多星融合增加的卫星在一定程度上可以相互补偿从而削弱多路径效应对定位结果的影响;当高度截止角大于40°时,单系统无法满足导航定位的需求,而多星融合因其可见卫星数增多,仍然可以得到较低且比较稳定的PDOP值,提供了高精度的定位服务.

This paper compares and analyses such aspects as muhipath effect, positioning data of the ionospheric delay, data utilization rate and signal -to -noise ratio, number of satellites and accuracy factor PDOP value of the Beidou Satellite （ BDS）, Dual - System Satellites （GPS/GLONASS） and Three - System Satellites （ BDS/ GPS/GLONASS）. Test analysis shows that the average rap1 and rape satellite fusion are decreased by 18% and 8% compared with the single BDS system, and increased fusion satellites can compensate each other so as to weaken the multipath effect on the positioning results to a certain extent ; when the cut - off angle is greater than 40 degrees, a single system cannot meet the need of the navigation and positioning, while multi - satellites can still get lower and more stable PDOP value and provide high precision positioning services because of the increas- ing numbers of visible satellites.