测绘通报 ›› 2023, Vol. 0 ›› Issue (4): 71-78.doi: 10.13474/j.cnki.11-2246.2023.0107

• 学术研究 • 上一篇    下一篇

顾及电离层延迟的BDS-3四频长基线定位算法

吕震1, 王振杰1, 刘金萍2, 翟建朋2, 周浩3   

  1. 1. 中国石油大学(华东) 海洋与空间信息学院, 山东 青岛 266580;
    2. 中石化石油工程地球物理 有限公司胜利分公司, 山东 东营 257100;
    3. 青岛北斗陆海科技有限公司, 山东 青岛 266555
  • 收稿日期:2022-06-14 发布日期:2023-04-25
  • 作者简介:吕震(1997—),男,硕士,研究方向为GNSS数据处理。E-mail:17864293627@163.com
  • 基金资助:
    中国石化集团公司科技攻关项目(JP210004)

BDS-3 quad-frequency long baseline positioning algorithm considering ionospheric delay

Lü Zhen1, WANG Zhenjie1, LIU Jinping2, ZHAI Jianpeng2, ZHOU Hao3   

  1. 1. College of Oceanography and Space Informatics, China University of Petroleum (East China), Qingdao 266580, China;
    2. Shengli Branch, Sinopec Geophysical Co., Ltd., Dongying 257100, China;
    3. Qingdao Beidou Land-sea Technology Co., Ltd., Qingdao 266555, China
  • Received:2022-06-14 Published:2023-04-25

摘要: 针对长基线定位中电离层延迟对定位精度造成的影响,本文提出了一种基于BDS-3四频信号(B1C/B1I/B2a/B3I)的四频消电离层(IF)组合方法,采用消电离层组合观测值消除电离层延迟误差,联合模糊度改正后的超宽巷或宽巷组合观测值构建定位方程,从而实现原始窄巷模糊度和基线位置坐标的解算。试验采用BDS-3四频数据对四频IF组合方法和基于GB-FCAR模型的电离层延迟参数估计方法的定位精度进行对比分析。结果表明,在对长度超过500 km的长基线进行定位解算时,四频IF组合方法可以实现电离层延迟误差消除。与电离层延迟参数估计方法相比,四频IF组合方法水平和垂直方向的定位精度均达分米级,提升幅度分别达35%和40%以上,定位精度显著提高,其相对定位精度可达1×10-9 m,满足长基线相对定位的要求。

关键词: BDS-3, 四频, 长基线, 参数估计, 消电离层组合

Abstract: Considering that ionospheric delay in long baseline positioning can affect the positioning accuracy, this paper proposes a quad-frequency ionosphere-free (IF) combination method based on BDS-3 four-frequency signals (B1C/B1I/B2a/B3I), which eliminates the ionospheric delay error by using the combined ionosphere-freeobservations and constructs the positioning equation by combining the ambiguity-corrected extra-wide-lane or wide-lane combination observations, so as to estimatethe raw narrow-lane ambiguity and baseline coordinates. The experiments are conducted to compare the positioning accuracy of quad-frequency IF combination method and ionospheric delay parameter estimation method based on GB-FCAR modelusing BDS-3 quad-frequency data. The results show that when long baseline is over 500 km,the quad-frequency IF combination method can eliminate ionospheric delay error. Compared with the ionospheric delay parameter estimation method, the positioning accuracy of the quad-frequency IF combination method can reach the decimeter level in both horizontal and vertical directions,the improvement can reach more than 35% and 40% respectively,which significantly improves the positioning accuracy. The relative positioning accuracy can reach 1×10-9 m, which meets the relative positioning requirements of long baselines.

Key words: BDS-3, quad-frequency, long baseline, parameter estimation, ionosphere-free combination

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