基于SHAKING方法的北斗星基增强系统电离层模型可用性分析

刘昂; 李子申; 王宁波; 张周宇; 汪亮; 邵搏

doi:10.12265/j.gnss.2024076

基于SHAKING方法的北斗星基增强系统电离层模型可用性分析

doi: 10.12265/j.gnss.2024076

刘昂^1,,
李子申^1, ,,
王宁波^1,,
张周宇^{1, 2,},
汪亮^1,,
邵搏^3,

1.
中国科学院空天信息创新研究院, 北京 100094
2.
中国科学院大学, 北京 100049
3.
中国电子科技集团公司第二十研究所, 西安 710068

基金项目: 国家自然科学基金 (42122026，42074043，42174038，42404013)；北京市科技新星计划 (20230484329)

详细信息

作者简介:
刘昂：(1994—)，男，博士，助理研究员，研究方向为GNSS电离层监测与模型化处理. E-mail：liuang@airacs.ac.cn

李子申：(1984—)，男，博士，研究员，研究方向为GNSS PPP-RTK高精度服务处理技术. E-mail：lizishen@aircas.ac.cn

王宁波：(1989—)，男，博士，副研究员，研究方向为GNSS 硬件延迟估计与大气建模处理. E-mail：wangningbo@aoe.ac.cn

通信作者:
李子申 E-mail: lizishen@aircas.ac.cn

中图分类号: P228
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- 文章访问数: 40
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- 被引次数: 0
出版历程
- 收稿日期: 2024-04-12
- 网络出版日期: 2024-11-01

Improvement of ionospheric availability for BeiDou satellite-based augmentation system based on SHAKING method

LIU Ang^1
,,
LI Zishen^{1
, ,},
WANG Ningbo^1
,,
ZHANG Zhouyu^{1, 2
,},
WANG Liang^1
,,
SHAO Bo^3
,

1.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
The 20th Research Institute of CETC,Xi’an 710068, China

摘要

摘要: 北斗星基增强系统(BeiDou Satellite-Based Augmentation System，BDSBAS)通过境内的监测站为中国及周边地区用户提供电离层改正及电离层完好性监测服务，因此其对电离层算法的可用性要求较高. 本文采用附加Kriging估计的调整球谐函数建模方法(adjusted spherical harmonics adding Kriging，SHAKING)解算BDSBAS电离层参数信息. 通过对现有星基增强系统(Satellite-Based Augmentation System，SBAS)电离层的性能分析可以发现，部分SBAS播发了标记为未监测点的延迟修正信息. 通过对中国区域SBAS格网点需求分析可以发现：在卫星截止高度角为15°时，SHAKING方法提供的电离层可用点为189个、不可用点为3个，满足服务需求；结合BDSBAS提供的钟轨改正信息，SHAKING方法较反距离加权插值(inverse distance weighted，IDW)方法的垂直制导进近可用性范围提高约30%.
- 北斗星基增强系统(BDSBAS) /
- 电离层 /
- 附加Kriging估计的调整球谐函数方法(SHAKING) /
- 反距离加权插值(IDW) /
- 格网点电离层垂直延迟 /
- 格网点电离层垂直误差
Abstract: The BeiDou Satellite-Based Augmentation System (BDSBAS) provides ionospheric correction and integrity monitoring services for users in China and surrounding regions through domestic monitoring stations. Therefore, it demands high availability of ionospheric algorithms. This paper utilizes the adjusted spherical harmonics adding Kriging (SHAKING) method to calculate ionospheric parameter information for BDSBAS. Performance analysis of existing Satellite-Based Augmentation System (SBAS) ionospheric models reveals that some SBAS systems broadcast delay correction information marked as unmonitored points. Demand analysis of regional SBAS grid points in China shows that when the satellite elevation angle is set as 15°, SHAKING provides 189 usable points and 3 unusable points. Combined with clock and orbit correction information provided by BDSBAS, SHAKING improves the availability range of approaches with vertical guidance by approximately 30% compared to the inverse distance weighting (IDW) method.

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图 1 基于IDW方法的IGP四象限搜索范围

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图 2 WAAS电离层增强信息GIVD及GIVE分布

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图 3 MSAS电离层GIVEI小提琴分布

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图 4 MSAS电离层可用性小提琴分布

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图 5 EGNOS电离层GIVEI小提琴分布

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图 6 GAGAN电离层GIVEI小提琴分布

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图 7 SDCM电离层GIVEI小提琴分布

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图 8 卫星截止高度角为5° SHAKING可用性

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图 9 卫星截止高度角为10° SHAKING可用性

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图 10 卫星截止高度角为15° SHAKING可用性

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图 11 BDSBAS民用服务平台IDW模型APV-1可用性

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图 12 BDSBAS民用服务平台SHAKING模型APV-1可用性

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表 1 GIVEI与GIVE对应关系

GIVEI	GIVE/m	$ \sigma _{{\mathrm{GIVE}}}^2 $
0	0.3	0.0084
1	0.6	0.0333
2	0.9	0.0749
3	1.2	0.1331
4	1.5	0.2079
5	1.8	0.2994
6	2.1	0.4075
7	2.4	0.5322
8	2.7	0.6735
9	3.0	0.8315
10	3.6	1.1974
11	4.5	1.8709
12	6.0	3.3260
13	15.0	20.7870
14	45.0	187.0826
15	未被监测	未被监测

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表 2 各SBAS电离层可用性总结

系统	方法	GIVEI	可用率/%	不可用率/%
WAAS	Kriging	8~15	99.50	0.05
MSAS	平面拟合	9~15	68.50	31.50
EGNOS	三角线性插值	5~14	100.00	0
GAGAN	双层建模	10~14	100.00	0
SDCM	-	3~14	99.95	0

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