摘要
针对多系统融合精密单点定位(PPP)中存在系统间偏差(ISB)的问题,分析全球定位系统(GPS)与中国北斗卫星导航系统(BDS)的偏差特性及其对PPP的影响:给出GPS与BDS、北斗二号(BDS-2)与北斗三号(BDS-3)之间ISB的变化特性;并总结采用不同处理方式对GPS/BDS融合PPP定位的影响;然后分别将ISB作为白噪声、随机游走过程、常数和分段常数进行处理,分析ISB长短期变化特性。实验结果表明:1)ISB的日变化相对稳定,其日平均值与接收机类型有关,长期稳定性和变化趋势与分析中心产品有关;2)当使用非重叠频率的BDS-2和BDS-3观测时,BDS-2/BDS-3的ISB不为0,即BDS-2和BDS-3之间存在系统偏差;3)使用武汉大学卫星导航定位技术研究中心(WHU)的精密产品,依据ISB不同的处理策略对组合PPP进行处理,其收敛时间和定位精度有一定影响,其中采用30 min分段常数估计的ISB结果为最优。
Aiming at the problem of Inter-System Bias(ISB)existed in the multi-GNSS(Global Navigation Satellite System)precise point positioning,the paper analyzed the ISB chatracteristic of Global Positioning System(GPS)and BeiDou navigation satellite System(BDS)and its impact on PPP:the characteristics of ISB for GPS/BDS,BDS-2/BDS-3 were given,and the influence with different processing methods on GPS/BDS fusion PPP was summarized;then the short-term and long-term change feature of ISB was analyzed through processing ISB as white noise,random walk process,constant and subsection constant respectively.Experimental result showed that:the daily variation of ISB would be relatively stable,its daily average value would be related to the type of receivers,and its long-term stability and changing trend would be related to the products of the analysis center;when observing with BDS-2 and BDS-3 of non-overlapping frequency,the ISB of BDS-2/BDS-3 would not be 0,indicating that there must be a systematic deviation between BDS-2 and BDS-3;moreover,by using the precise products of WHU Analysis Center,different ISB processing strategies would slightly affect the convergence time and positioning accuracy of combined PPP,and the 30 min subsection constant estimation of ISB would have better positioning performance.
作者
宋美慧
柴艳菊
张宝成
SONG Meihui;CHAI Yanju;ZHANG Baocheng(State Key Laboratory of Geodesy and Earth’s Dynamics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430077,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《导航定位学报》
CSCD
2020年第6期46-52,共7页
Journal of Navigation and Positioning
基金
国家自然科学基金项目(41674020,41674021)
国家重点研发计划项目(2016YFB501700,2016YFB0501900)
大地测量与地球动力学国家重点实验室项目(Y909261026)。
