【作者】 李树文；

【导师】 王潜心； 聂泽栋；

【作者基本信息】 中国矿业大学 ， 测绘工程（专业学位）， 2022， 硕士

【摘要】 北斗卫星导航系统(BDS)第55颗卫星发射升空并成功进入预定轨道,标志着中国北斗全球卫星导航系统(BDS-3)正式完成组网并开始提供全球服务,其导航与位置服务性能受到诸多关注,而随着全球卫星导航系统(GNSS)的快速发展,多模多频精密单点定位(PPP)成为卫星导航领域研究热点,讨论BDS-3多模多频PPP对提升BDS全球服务性能意义重大。本文将围绕BDS-3多模多频定位中数据联合处理问题展开研究,其主要研究内容和结论如下:(1)通过i GMAS跟踪站多天实测数据,从完整率、信噪比等多个评估指标对BDS-3卫星播发的新信号B1C/B2a进行全面系统分析。整体来说,B1C与B2a各方面相差不大,性能表现较好,与GPS、Galileo兼容信号处于同一水平。(2)针对BDS-3/GPS/Galileo系统间偏差特性进行深入研究,从ISB短期、长期特性、与接收机类型和天线类型的相关性、对定位性能的影响等多角度进行分析。结果表明,ISB短期和长期稳定表现均较好,且与接收机类型和天线类型均表现相关性,对(B1I,B3I)/(L1,L2)/(E1,E5a)频率组合体现在收敛时间上,对(B1C,B2a)/(L1,L5)/(E1,E5a)频率组合的定位影响可以忽略不计。(3)基于全球不同区域MGEX测站数据对BDS-3单、双、三频进行定位性能分析,单频PPP中,B1C信号表现最优;双频PPP中,BDS-3 B1C/B2a与GPS L1/L2处于同一水平,优于B1I/B3I,收敛时间提升了13%;三频PPP方面,四种频率组合定位精度差别不大,主要体现在收敛时间上,其中,B1C/B3I/B2a组合表现最好。(4)深入探讨了IFB的长期、短期变化特性并分析了顾及IFB BDS-3三频定位性能。结果表明,IFB短期和长期变化稳定性均较高,IFB变化与接收机类型相关而与天线类型无关,IFB参数对BDS-3三频PPP定位精度和收敛时间影响可以忽略,对伪距单点定位(SPP)的精度提升明显,E、N、U方向总体提升可达到52.5%、47.5%、24.2%。(5)根据数据质量分析与多模多频定位理论及相关开源软件,开发了多系统数据质量分析软件、多模多频高精度定位软件(MMPS)及实现了相应偏差参数的输出,设计了可视化界面,对软件进行测试,便于进一步对结果进行分析研究。本文共有图51幅,表24个,参考文献87篇。更多还原

【Abstract】 The launch and successfully enter preset orbit of Beidou satellite navigation system(BDS)55 satellite marked China Beidou global navigation satellite system(BDS-3)formally completed network and began to provide global service,the performance of navigation and location service of BDS-3 received much attention,and with the rapid development of global navigation satellite system(GNSS),multimode and multi-frequency precision point positioning(PPP)has become a research hotspot in the field of satellite navigation,discuss that BDS-3 multi-mode and multifrequency PPP is of great significance to improve the performance of BDS global service.Therefore,this thesis will focus on the data joint processing in BDS-3 multimode and multi-frequency positioning,and the main researches and corresponding conclusions are as follows:(1)Through the measured data of i GMAS tracking stations,the new signal B1C/B2 a broadcast by BDS-3 satellite is comprehensively and systematically analyzed from multiple evaluation indexes such as integrity rate and signal-to-noise ratio.On the whole,B1 C and B2 a have little difference in all aspects,with good performance,and are at the same level as GPS and Galileo compatible signals.(2)In view of the comprehensive and systematic study on the inter-system bias(ISB)characteristics between BDS-3/GPS/Galileo,this thesis analyzes the short-term and long-term characteristics of ISB,the correlation with receiver type and antenna type,and the impact on positioning performance.The results show that the short-term and long-term stability performance of ISB is good,and it is related to the receiver type and antenna type.The convergence time of(B1I,B3I)/(L1,L2)/(E1,E5a)frequency combination is reflected,and the positioning effect of(B1C,B2a)/(L1,L5)/(E1,E5a)frequency combination is negligible.(3)Based on the data of MGEX stations in different regions of the world,the positioning performance of BDS-3 single-frequency,dual-frequency and threefrequency is analyzed.In single-frequency PPP,B1 C signal is the best;In dualfrequency PPP,BDS-3 B1C/B2 a is at the same level as GPS L1/L2,better than B1I/B3 I,and the convergence time is increased by 13%;In terms of three-frequency PPP,the positioning accuracy of the four frequency combinations has little difference,which is mainly reflected in the convergence time.Among them,B1C/B3I/B2 a combination performs best.(4)The long-term and short-term variation characteristics of inter-frequency bias(IFB)are deeply discussed,and the three frequency positioning performance of BDS-3 considering IFB is analyzed.The results show that the short-term and longterm variation stability of IFB is high.The variation of IFB is related to the type of receiver but not to the type of antenna.The influence of IFB parameters on the positioning accuracy and convergence time of BDS-3 three frequency PPP can be ignored.The accuracy of pseudorange standard single positioning(spp)can be significantly improved,and the overall improvement in E,N and U directions can reach 52.5%,47.5% and 24.2%.(5)According to the principles of data quality analysis and multi-mode and multi-frequency positioning and relevant open source software,the multi system data quality analysis software and multi-mode multi-frequency point positioning software(MMPS)are developed,and the output of corresponding bias parameters is realized,the visual interface is designed and software is tested to facilitate further analysis and research of the results.更多还原