二阶电离层延迟对GPS PPP时间传递的影响

doi:10.19665/j.issn1001-2400.2021.04.007

西安电子科技大学学报 ›› 2021, Vol. 48 ›› Issue (4): 50-56.doi: 10.19665/j.issn1001-2400.2021.04.007

• 信息与通信工程&电子科学与技术 • 上一篇下一篇

二阶电离层延迟对GPS PPP时间传递的影响

丁硕^1,²(),杨海彦^1,^2,³(),杨旭海^1,^2,³(),张喆^1,^2,³(),赵坤娟^1,²()

1.中国科学院国家授时中心,陕西西安 710600
2.中国科学院大学天文与空间科学学院,北京 100049
3.中国科学院精密导航定位与定时技术重点实验室,陕西西安 710600

收稿日期:2020-02-03 出版日期:2021-08-30 发布日期:2021-08-31
通讯作者: 杨海彦
作者简介:丁硕(1982—),男,中国科学院大学博士研究生,E-mail: dingshuo@mails.ucas.ac.cn|杨旭海(1972—),男,研究员,博士,E-mail: yyang@ntsc.ac.cn|张喆(1989—),男,助理研究员,中国科学院大学博士研究生,E-mail: zhangzhe@ntsc.ac.cn|赵坤娟(1986—),女,助理研究员,博士,E-mail: zhaokunjuan@ntsc.ac.cn
基金资助:
国家自然科学基金面上项目(12073034);中国科学院“西部之光”项目(XAB2017B11);中国科学院“西部之光”人才培养引进计划(XAB2018YDYL01)

Influence of the second-order ionospheric delay on GPS PPP time transfer

DING Shuo^1,²(),YANG Haiyan^1,^2,³(),YANG Xuhai^1,^2,³(),ZHANG Zhe^1,^2,³(),ZHAO Kunjuan^1,²()

1. National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China
2. School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China
3. Key Laboratory of Precision Navigation and Timing Technology,Chinese Academy of Sciences,Xi’an 710600,China

Received:2020-02-03 Online:2021-08-30 Published:2021-08-31
Contact: Haiyan YANG

摘要/Abstract

摘要：

针对精密单点定位时间传递观测模型无法消除二阶电离层延迟误差的实际问题,推导了顾及二阶电离层延迟误差修正的观测模型。应用两个时段实测数据,比较分析了二阶电离层延迟改正前与改正后的精密单点定位测站钟差和时间传递结果。分析表明,二阶电离层延迟对低纬度地区测站钟差影响显著,对中、高纬度的影响逐渐减弱;测站钟差差异序列呈固定偏差加周日变化,固定偏差在南北半球符号相反。二阶电离层对长基线时间传递的影响最大超过26皮秒,对短基线的影响基本可以忽略。据此,提出亚纳秒级长基线时间传递进行二阶电离层延迟修正是必要的,特别是组成基线的测站位于低纬度地区。

关键词: 全球定位系统, 精密单点定位, 二阶电离层延迟, 钟差, 时间传递

Abstract:

In view of the practical problem that the second-order ionospheric delay error (Ion2) is not corrected in Precise Point Positioning (PPP) time transfer,the PPP observation equation with the Ion2 is derived.The PPP clocks and time transfer with and without the Ion2 correction are compared and analyzed using two test periods.Based on the measured data,analysis shows that the influence of the Ion2 on the PPP clocks at a low-latitude are more significant than that of mid-latitude and polar regions.The difference series of PPP clock solutions shows fixed deviation plus some diurnal variations,and the sign of fixed deviation is opposite in the northern and southern hemispheres.The maximum influence of the Ion2 on the long time-links transfer can be up to more than 26ps,but for the short time-links,it can be ignored.Therefore the Ion2 correction is necessary for sub-nanosecond PPP time transfer over long time-links,especially when the time-links are made by the stations located in low-latitude regions.

Key words: global positioning system, precise point positioning, second-order ionospheric delay, clocks, time transfer

中图分类号:

P127.1

丁硕,杨海彦,杨旭海,张喆,赵坤娟. 二阶电离层延迟对GPS PPP时间传递的影响[J]. 西安电子科技大学学报, 2021, 48(4): 50-56.

DING Shuo,YANG Haiyan,YANG Xuhai,ZHANG Zhe,ZHAO Kunjuan. Influence of the second-order ionospheric delay on GPS PPP time transfer[J]. Journal of Xidian University, 2021, 48(4): 50-56.

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测站名称	纬度	经度	接收机	天线
NYAL	78.93 N	11.87 E	TRIMBLE NETRS	AOAD/M_B
PTBB	52.30 N	10.46 E	ASHTECH Z-XII3T	ASH700936E
IENG	45.02 N	7.64 E	ASHTECH Z-XII3T	ASH701945C_M
AMC2	38.80 N	104.52 W	ASHTECH Z-XII3T	AOAD/M_T
KAT1	14.38 S	132.15 E	SEPT POLARX5	LEIAR25.R3
OHI3	63.32 S	57.90 W	LEICA GR25	LEIAR25.R4

测站	第71~79天		第171~179天
测站	固定偏差	标准差	固定偏差	标准差
AMC2	-6.43	4.22	-6.29	3.36
IENG	-5.33	3.49	-4.86	2.47
NYAL	-5.51	2.22	-5.84	2.24
PTBB	-4.49	3.43	-5.76	2.73
KAT1	14.50	6.25	4.81	3.10
OHI3	3.51	2.41	1.34	1.49

测站	第71~79天		第171~179天		基线长度/km
测站	固定偏差/ps	标准差/ps	固定偏差/ps	标准差/ps	基线长度/km
AMC2-PTBB	-1.94	8.27	-0.56	4.34	7 589.56
IENG-PTBB	-0.85	2.38	0.90	2.32	835.17
KAT1-PTBB	18.79	7.73	10.57	3.81	6 157.70
NYAL-PTBB	-1.02	3.08	-0.08	2.70	2 943.20
OHI3-PTBB	8.00	4.37	7.12	2.81	12 295.22

二阶电离层延迟对GPS PPP时间传递的影响

Influence of the second-order ionospheric delay on GPS PPP time transfer

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