测绘通报 ›› 2018, Vol. 0 ›› Issue (9): 13-18,23.doi: 10.13474/j.cnki.11-2246.2018.0271

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Stability and Precision Analysis of BeiDou+GLONASS+Galileo Multi-system Combined SPP

BU Jinwei1, ZUO Xiaoqing1, JIN Lixin2,3, LI Haiqiang1, ZHOU Yujia1, CHANG Jun4   

  1. 1. School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    2. China Railway First Survey and Design Institute Group Co. Ltd., Xi'an 710043, China;
    3. The General Engineering Survey Institute of Railways of Gansu Co. Ltd., Lanzhou 730000, China;
    4. First Survey Team of State Bureau of Surveying and Mapping Geographic Information, Xi'an 710054, China
  • Received:2018-04-19 Revised:2018-06-19 Online:2018-09-25 Published:2018-09-29
  • Contact: 左小清。E-mail:zuoxq@163.com E-mail:zuoxq@163.com

Abstract:

Based on the indirect adjustment method and the principle of least squares,the mathematical model of the combined standard single point positioning (SPP) of BeiDou+GLONASS+Galileo system is deduced.Then,using the observation data from some stations of the MGEX station,authors comprehensively analyze the number of visible satellites,DOP values,positioning stability,and positioning accuracy from different combinations of BeiDou,GLONASS or Galileo.The experimental results show that the DOP values of the BeiDou+GLONASS+Galileo three-system combination is reduced by 30%~55% and 10%~50% respectively compared to the single system (BeiDou,GLONASS,Galileo) and the dual system (BeiDou+GLONASS,BeiDou+Galileo,GLONASS+Galileo). Visible satellites increased by 60%~120% and 10%~110% respectively.In addition,with a cut-off elevation angle greater than 30°,the DOP values of single-system and dual-system are large and fluctuating.The positioning reliability and epoch availability are significantly reduced,while the BeiDou+GLONASS+Galileo combination can still get better positioning results.This has practical application value under the harsh conditions of building-intensive areas,mountains and satellite shelters.

Key words: BeiDou+GLONASS+Galileo, multi-system combination, SPP, number of visible satellites and DOP values, positioning accuracy

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