测绘通报 ›› 2019, Vol. 0 ›› Issue (8): 1-7.doi: 10.13474/j.cnki.11-2246.2019.0241

• 学术研究 •    下一篇

北斗三号观测数据质量及定位精度初步评估

程军龙, 王旺, 马立烨, 刘万科   

  1. 武汉大学测绘学院, 湖北 武汉 430079
  • 收稿日期:2018-11-12 修回日期:2019-04-29 出版日期:2019-08-25 发布日期:2019-09-06
  • 作者简介:程军龙(1993-),男,硕士生,主要研究方向为卫星导航定位定轨技术。E-mail:janloinge@qq.com
  • 基金资助:
    国家自然科学基金(41774031;91638203)

Preliminary analysis of observation quality and positioning precision for BDS-3 satellites

CHENG Junlong, WANG Wang, MA Liye, LIU Wanke   

  1. School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China
  • Received:2018-11-12 Revised:2019-04-29 Online:2019-08-25 Published:2019-09-06

摘要: 开展BDS-3观测数据质量评估对于即将到来的BDS-3应用研究至关重要。本文从载噪比、伪距多路径及观测噪声3方面评估了BDS-3卫星的观测数据质量,在此基础上分析了其标准单点定位和短基线相对定位性能。初步评估结果表明:在载噪比方面,BDS-3卫星的B1I频点比BDS-2卫星高3~4 dB/Hz,B3I频点最高,其余频点大小相当;在多路径方面,BDS-3卫星伪距B2a、B2b和B3I与BDS-2的B3I大小相当,B1I和B1C与BDS-2的B1I、B2I大小相当,且BDS-3各频点的伪距多路径组合中不存在明显的与高度角相关的伪距偏差;在观测值噪声方面,BDS-3卫星与BDS-2卫星各频点大小基本相当。相比于仅使用BDS-2卫星,增加BDS-3卫星可以改善几何图形结构,一定程度上提高伪距单点定位和短基线相对定位的精度。

关键词: 北斗三号卫星, 载噪比, 伪距多路径, 观测噪声, 双差残差, 单点定位, 相对定位

Abstract: Analysis of the BDS-3 observation quality is very important for the upcoming relevant applications and research of BDS-3. This paper evaluates the observation quality of BDS-3 satellites, including the carrier noise ratio (C/N0), pseudo-range multipath, observation noise, and analyzes the precision of single-point positioning (SPP) and short-baseline relative positioning. The results show that the average C/N0 values for B1I of BDS-3 satellites are 3~4 dB/Hz higher than those of BDS-2 satellites. In terms of BDS-3 satellites signals, the average C/N0 values for B3I is the highest and the others are sizable. In the aspect of pseudo-range multipath values, B2a/B2b/B3I of BDS-3 working satellite and B3I of BDS-2 satellites are sizable, and those are slightly lower than that of B1I/B1C of BDS-3 satellites and that of B1I/B2I of BDS-2 satellites. As for observation noise, BDS-3 satellites and BDS-2 working satellites are on the same level. The precision of positioning that used BDS-2 and BDS-3 satellites is slightly greater than that only used BDS-2 satellites because of improving the observation geometry.

Key words: BDS-3 satellites, carrier noise ratio, pseudo-range multipath, observation noise, double-differenced residual, single-point positioning, relative positioning

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