摘要详情
297 / 2023-10-11 15:12:03
Performance Analysis of GPS / BDS-3 / Galileo / QZSS Overlapping Frequency Long-distance Undifferenced RTK Positioning
GPS/BDS-3/Galileo/QZSS,Overlapping frequencies,Loose integration,Tight integration,long distance,undifferenced RTK
全文待审
Loose integration and tight integration positioning are usually used for multi-frequency and multi-system observations. The difference lies in the selection of reference satellites. BeiDou-3 Navigation Satellite System ( BDS-3 ) supports the broadcast of two new signals, B1C and B2a, which have the same frequency as other Global Navigation Satellite System ( GNSS ). In order to make full use of the overlapping frequency characteristics of GPS / BDS-3 / Galileo / QZSS, BDS-3 supports the broadcast of two new signals, B1 C and B2 a, which have the same frequency as other GNSS. To verify the compatibility and interoperability between global satellite navigation systems and the applicability and stability of tight integration, this paper analyzes the long baseline undifferenced RTK positioning performance of GPS ( L1 / L5 ) + BDS-3 ( B1c / B2a ) + Galileo ( E1 / E5a ) + QZSS ( L1 / L5 ) dual-frequency multi-system loose integration and tight integration. Firstly, the undifferenced RTK mathematical model of the loosely combined and tightly combined dual-frequency multi-system is established, and the ionospheric and tropospheric delay errors are corrected by the error correction model. The atmospheric delay residual is modeled by the random walk constraint model between epochs, and the constraint between epochs is added to speed up the convergence speed of ambiguity. Then, the ambiguity is fixed by the least square AMBiguity Decorrelation Adjustment ( LAMBDA ). Finally, the fixed ambiguity is brought back to solve the position parameters. The measured data of four groups of long-distance Continuously Operating Reference Stations ( CORS ) networks with the same receiver type in different regions are selected for algorithm verification. The tight integration based on GPS / BDS-3 / Galileo / QZSS overlap frequency can effectively improve the positioning accuracy and the Terms of Time to the First Fix ( TTFF ) compared with the loose integration. The static and dynamic tight integration compared with the loose integration positioning accuracy in different directions has 5 % ~ 20 % improvement, and the first fixed time has more than 40 % improvement. Especially in harsh environments, the positioning accuracy of static and dynamic tight integration is improved by more than 10 % in different directions on average compared with that of loose integration, and the first convergence time is improved by more than 60 % on average. It is verified that the tightly combined long-distance undifferenced RTK positioning algorithm can achieve centimeter-level positioning of the mobile station faster and has stronger applicability and stability.
重要日期
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会议日期
10月26日
2023
至10月29日
2023
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10月15日 2023
摘要截稿日期
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10月15日 2023
初稿截稿日期
-
11月13日 2023
注册截止日期
主办单位
国际矿山测量协会
中国煤炭学会
中国测绘学会
中国煤炭学会
中国测绘学会
承办单位
中国矿业大学
中国煤炭科工集团有限公司
中国煤炭科工集团有限公司
