北斗广域差分分米级定位的分区切换算法

doi:10.11947/j.AGCS.2019.20180545

测绘学报 ›› 2019, Vol. 48 ›› Issue (7): 822-830.doi: 10.11947/j.AGCS.2019.20180545

北斗广域差分分米级定位的分区切换算法

陈俊平^1,2,3, 王阿昊^1,4, 张益泽¹, 周建华⁵, 王兵浩⁶, 王解先⁴

1. 中国科学院上海天文台, 上海 200030;
2. 中国科学院大学天文与空间科学学院, 北京 100049;
3. 上海市空间导航与定位技术重点实验室, 上海 200030;
4. 同济大学测绘与地理信息学院, 上海 200092;
5. 北京卫星导航中心, 北京 100094;
6. 战略支援部队信息工程大学, 河南郑州 450001

收稿日期:2018-11-26 修回日期:2019-04-09 出版日期:2019-07-20 发布日期:2019-07-26
通讯作者: 周建华 E-mail:yishu-zhou@263.net
作者简介:陈俊平(1980-),男,研究员,研究方向为卫星大地测量。
基金资助:
国家自然科学基金（11673050）；国家重点研发计划（2018YFB0504300）

PPP algorithm using BDS new SBAS differential corrections

CHEN Junping^1,2,3, WANG Ahao^1,4, ZHANG Yize¹, ZHOU Jianhua⁵, WANG Binghao⁶, WANG Jiexian⁴

1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;
2. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China;
3. Shanghai Key Laboratory of Space Navigation and Positioning Techniques, Shanghai 200030, China;
4. College of Surveying and Geo-Informatics, Tong ji University, Shanghai 200092, China;
5. Beijing Satellite Navigation Center, Beijing 100094, China;
6. Information Engineering University, Zhengzhou 450001, China

Received:2018-11-26 Revised:2019-04-09 Online:2019-07-20 Published:2019-07-26
Supported by:
The National Natural Science Foundation of China (No. 11673050); The National Key Research and Development Program of China (No. 2018YFB0504300)

摘要/Abstract

摘要： 从2017年1月开始，北斗系统在播发基本导航电文的同时，提供了包含实时轨道改正数、钟差改正数、电离层格网改正数和分区综合改正数四重广域差分参数，使得系统具备了基于系统广播的电文参数实现广域单站实时动态分米级定位的能力。实际应用表明，北斗系统播发的分区综合改正数存在中断的情况，使得实时定位存在因重新收敛而造成跳变的情况。本文分析了分区中断期间定位跳变产生的原因，提出一种适用于分区切换的广域差分分米级定位算法。采用中国境内7个北斗测站10 d的静态数据和车载动态数据对新算法进行评估验证。结果表明，在分区改正数中断的情况下，分区切换算法得到的坐标误差与使用连续分区综合改正数结果一致，双频动态定位水平和高程方向分别小于0.3 m和0.5 m，平均三维定位精度优于0.5 m；车载实时动态定位测试中，分区切换前后的单双频定位精度不受切换影响，与切换前保持一致。分区切换算法有效保证了分区改正数中断后北斗广域分米级实时动态定位的连续性。

关键词: 北斗卫星导航系统, 广域差分, 分区综合改正数, 精密单点定位

Abstract: Since January 2017, BDS provides users with decimeter-level SBAS point positioning capability through the broadcasting of upgraded differential corrections, including satellite orbit error corrections, satellite clock error corrections, ionosphere grid corrections and zone corrections. In practice, however, the real-time zone corrections experience discontinuities causing the re-initialization of carrier-phase based positioning. We develop a new BDS SBAS precise point positioning (PPP) algorithm based on the switching of zone corrections among neighboring zones. Applying the new algorithm, users switch to use the zone corrections of the neighboring zones in case of no corrections received of the current zone, and thus avoid positioning re-initialization. Data of 7 BDS tracking stations and real-time kinematic on-road tracks are used to evaluate the new algorithm. Results show that with the implementation of the new algorithm, the positioning accuracy of BDS kinematic dual-frequency PPP is better than 0.3 m and 0.5 m in horizontal and vertical during the period of zone switching. On-road real-time single and dual frequency kinematic PPP shows no positioning re-initialization and the positioning accuracy remains at the level of better than 0.5 m during the discontinuity of zone corrections.

Key words: BeiDou satellite navigation system, satellite based augmentation system, zone correction, precise point positioning

中图分类号:

P228

陈俊平, 王阿昊, 张益泽, 周建华, 王兵浩, 王解先. 北斗广域差分分米级定位的分区切换算法[J]. 测绘学报, 2019, 48(7): 822-830.

CHEN Junping, WANG Ahao, ZHANG Yize, ZHOU Jianhua, WANG Binghao, WANG Jiexian. PPP algorithm using BDS new SBAS differential corrections[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(7): 822-830.

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北斗广域差分分米级定位的分区切换算法

PPP algorithm using BDS new SBAS differential corrections

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