BDS-3实时精密产品质量评估及其PPP性能分析

随着北斗三号全球卫星导航系统的正式开通，各数据分析中心陆续开始提供北斗三号系统的实时精密产品，使基于北斗三号的实时精密单点定位（PPP）成为可能。实时精密产品质量是影响实时PPP定位性能的重要因素，直接决定了实时PPP的可用性、收敛时间和定位精度。为了促进基于北斗三号的实时PPP的研究和应用发展，本文对现有的北斗三号实时精密产品质量进行了评估，包括数据完整率、钟差精度和轨道精度，并结合全球均匀分布的5个基准站的观测数据，分析了北斗三号的实时PPP性能。试验结果表明，北斗三号实时数据完整率为98.3%，精密钟差和轨道精度分别为0.8 ns、8 cm，加入北斗三号系统后，相比GPS的实时PPP收敛速度提高了30%，定位精度提高了8%。

Quality assessment of BDS-3 real-time precision product and analysis of PPP performance

With the official opening of the BDS-3,various data analysis centers have successively begun to provide real-time precision products of the BDS-3 system,making real-time precise point positioning( PPP) based on the BDS-3 is possible. The quality of realtime precision products is an important factor affecting real-time PPP positioning performance,and directly determines the availability,convergence time and positioning precision of real-time PPP. In order to promote the research and application development of real-time PPP based on BDS-3,this paper evaluates the quality of the existing BDS-3 real-time precision products,including data integrity rate,clock bias precision,and orbit precision,combined with observation data from 5 reference stations evenly distributed around the world,and analyzes the real-time PPP of BDS-3 performance. Experimental results show that the real-time data integrity rate of BDS-3 is 98.3%,and the precise clock bias and orbit precision are 0. 8 ns and 8 cm respectively. Compared with GPS,the real-time PPP convergence speed is increased by 30%,and the positioning precision is increased by 8% after joining the BDS-3 system.