北斗三号PPP-B2b信号精密单点定位服务可用性分析

许扬胤; 任夏; 明锋

doi:10.12265/j.gnss.2023214

北斗三号PPP-B2b信号精密单点定位服务可用性分析

doi: 10.12265/j.gnss.2023214

许扬胤^{1, 2, ,},
任夏^{1, 2},
明锋^{1, 2}

1.
地理信息工程国家重点实验室, 西安 710054
2.
西安测绘研究所, 西安 710054

基金项目: 国家自然科学基金基础科学中心项目(42388102)；地理信息工程国家重点实验室基金(SKLGIE2022-ZZ-02)

详细信息

作者简介:
许扬胤：(1992—)，男，博士，助理研究员，研究方向为GNSS精密定位与质量控制. E-mail: xu_yangyin@163.com

任夏：(1988—)，女，博士，助理研究员，研究方向为GNSS自主导航. E-mail: renxia1015@163.com

明锋：(1982—)，男，博士，助理研究员，研究方向为大地测量与时空基准. E-mail: fengmingchyjs@outlook.com

通讯作者:
许扬胤 E-mail: xu_yangyin@163.com

中图分类号: P228.41
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- 被引次数: 0
出版历程
- 收稿日期: 2023-11-17
- 录用日期: 2023-11-17

Availability analysis of BDS-3 PPP-B2b real-time precise point positioning service

XU Yangyin^{1, 2
, ,},
REN Xia^{1, 2},
MING Feng^{1, 2}

1.
State Key Laboratory of Geo-Information Engineering, Xi’an 710054, China
2.
Xi’an Research Institute of Surveying and Mapping, Xi’an 710054, China

摘要

摘要: 针对北斗三号(BeiDou-3 Navigation Satellite System，BDS-3) PPP-B2b信号精密单点定位(precise point positioning，PPP)服务可用性，以改正参数的可用性比例、平均可用卫星数和改正参数匹配性为指标进行了系统分析. 结果表明：在中国及周边地区，BDS-3 PPP-B2b信号改正参数的可用性在71%~95%，且在北京地区达到最大，GPS改正参数可用性在68.5%~88.6%，差于BDS-3. 中国及周边地区用户缺少PPP-B2b信号改正参数的卫星观测弧段主要集中在低高度角时段，其改正参数的可用性随着截止高度角的增大而增大；BDS-3、GPS和BDS-3/GPS在中国及周边地区的改正数可用平均卫星数分别约为8颗、7颗和15颗，可以确保有效的实时PPP (real time PPP，RT-PPP)服务性能，但平均约有1颗BDS-3卫星和2颗GPS卫星因为缺少PPP-B2b信号改正参数而无法参与RT-PPP服务；对于赤道以南地区，单个系统基本无法提供有效的PPP-B2b服务，其改正参数的平均可用性低于50%，但BDS-3/GPS双系统在部分低纬度地区可提供约7~11颗的可用卫星；由于轨道改正参数和钟差改正参数更新频率不一致，在钟差改正数版本号(IOD Corr)参数更新时，会出现短暂的改正参数不匹配情况.
- 北斗三号(BDS-3) /
- PPP-B2b信号改正参数 /
- 实时精密单点定位(RT-PPP) /
- 可用性 /
- 可用卫星数 /
- 匹配性
Abstract: Aiming at the availability of BDS-3 PPP-B2b service, a systematic analysis has been conducted towards the availability ratio of PPP-B2b corrections, the average number of satellites with available corrections and the matching characteristics of PPP-B2b corrections. The results show that in China and surrounding areas, the availability of BDS-3 PPP-B2b corrections is between 71% and 95%, and reaches the maximum in Beijing. While that for the GPS system is between 68.5% and 88.6%, which is worse than the BDS-3. The satellite observation arcs lack of PPP-B2b corrections are mainly concentrated in low elevation angle periods for users in China and surrounding areas, and the availability of PPP-B2b corrections will increase with the increase of cut-off elevation angle. The average number of satellites with available PPP-B2b corrections for BDS-3, GPS and BDS-3/GPS systems in China and surrounding areas is about 8, 7 and 15 respectively, which can ensure effective real-time PPP service performance. However, on average, about 1 BDS-3 satellite and 2 GPS satellites cannot participate in the real-time PPP positioning due to the lack of PPP-B2b corrections for users in the area. For areas south of the equator, BDS-3 only or GPS-only system is basically unable to provide effective real-time PPP services with the average availability of PPP-B2b correction being less than 50%, but the BDS-3/GPS dual system can provide about 7 to 11 available satellites in some low latitude areas. Users should be noticed that there will be a temporary mismatching state between the orbit and clock offset corrections each time when the IOD Corr parameter changes due to the different updating frequency.
- BDS-3 /
- PPP B2b corrections /
- real-time PPP service /
- availability /
- number of visible satellites /
- matching characteristics

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图 1 BDS-3 PPP-B2b信号PPP服务覆盖区域

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图 2 PPP-B2b信号改正参数EAR分布

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图 3 BDS-3与GPSEAR的差值分布

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图 4 改正参数可用平均卫星数和观测可用平均卫星数与改正参数可用平均卫星数的差值

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图 5 轨道与钟差改正参数IOD Corr时间序列

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表 1 PPP-B2b信号改正电文信息类型

信息类型	信息内容
1	卫星掩码
2	卫星轨道改正数及用户测距精度指数
3	差分偏码
4	卫星钟差改正数
5	用户测距精度指数
6	钟差改正数与轨道改正数-组合1
7	钟差改正数与轨道改正数-组合2
8~62	预留
63	空

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表 2 PPP-B2b信号改正参数EAR统计情况 %

卫星	区域A			区域B			区域C
卫星	min	max	mean	min	max	mean	min	max	mean
BDS-3 IGSO	81.3	99.7	96.7	79.2	99.7	94.9	53.1	89.2	69.5
BDS-3 MEO	62.9	94.1	82.7	42.8	94.1	73.7	16.7	69.3	41.1
BDS-3	71.0	95.4	85.9	51.6	95.4	78.1	21.8	72.1	47.2
GPS	68.5	88.6	81.5	46.1	88.6	71.0	11.3	66.0	35.7
BDS-3/GPS	69.8	91.6	83.8	49.9	91.6	74.6	16.7	69.2	41.5

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表 3 区域A PPP-B2b信号改正参数EAR随高度角变化情况 %

卫星	10°			20°			30°			40°
卫星	min	max	mean	min	max	mean	min	max	mean	min	max	mean
BDS-3 IGSO	81.3	99.7	96.7	93.8	99.7	99.0	98.1	99.7	99.5	99.4	99.9	99.6
BDS-3 MEO	62.9	94.1	82.7	70.9	98.2	89.3	78.8	99.3	93.9	85.0	99.4	96.7
BDS-3	71.0	95.4	85.9	78.9	98.6	91.8	83.7	99.4	95.5	88.6	99.5	97.6
GPS	68.5	88.6	81.5	77.0	91.3	87.1	81.9	92.8	90.4	84.6	95.0	92.1
BDS-3/GPS	69.8	91.6	83.8	78.0	94.7	89.6	83.5	96.3	93.2	87.1	97.5	95.2

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表 4 区域B PPP-B2b信号改正参数EAR随高度角变化情况 %

卫星	10°			20°			30°			40°
卫星	min	max	mean	min	max	mean	min	max	mean	min	max	mean
BDS-3 IGSO	79.2	99.7	94.9	79.2	99.7	97.1	87.4	99.7	98.7	93.5	99.9	99.3
BDS-3 MEO	42.8	94.1	73.7	45.1	98.2	80.6	47.1	99.3	86.5	48.9	99.4	90.6
BDS-3	51.6	95.4	78.1	53.3	98.6	84.3	51.4	99.4	89.2	49.0	99.5	92.3
GPS	46.1	88.6	71.0	49.4	91.3	77.5	43.9	92.8	82.7	47.0	95.0	86.2
BDS-3/GPS	49.9	91.6	74.6	52.2	94.7	81.0	52.9	96.3	86.1	53.4	97.5	89.4

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表 5 ANSat-PPP-B2b统计

系统	区域A			区域B			区域C
系统	min	max	mean	min	max	mean	min	max	mean
BDS-3	6.5	8.6	7.9	5.0	8.6	7.3	2.0	7.8	4.5
GPS	6.2	7.5	7.0	4.4	7.5	6.4	1.1	6.3	3.2
BDS-3/GPS	12.9	15.9	14.9	9.7	15.9	13.7	3.2	14.1	7.7

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表 6 ANSat与ANSat-PPP-B2b差值统计

系统	区域A			区域B			区域C
系统	min	max	mean	min	max	mean	min	max	mean
BDS-3	0.4	2.8	1.3	0.4	4.7	2.1	3.0	7.2	4.9
GPS	1.0	2.9	1.6	1.0	5.1	2.6	3.2	8.7	5.8
BDS-3/GPS	1.5	5.7	2.9	1.5	9.8	4.7	6.2	15.9	10.6

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表 7 区域A的ANSat-PPP-B2b随高度角变化情况

系统	10°			20°			30°			40°
系统	min	max	mean	min	max	mean	min	max	mean	min	max	mean
BDS-3	6.5	8.6	7.9	5.3	7.4	6.8	4.3	6.2	5.6	3.17	4.82	4.33
GPS	6.2	7.5	7.0	5.2	6.0	5.8	4.1	4.7	4.5	2.66	3.54	3.27
BDS-3/GPS	12.9	15.9	14.9	10.5	13.4	12.5	8.5	10.8	10.1	5.83	8.30	7.61

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表 8 区域B的ANSat-PPP-B2b数随高度角变化情况

系统	10°			20°			30°			40°
系统	min	max	mean	min	max	mean	min	max	mean	min	max	mean
BDS-3	5.0	8.6	7.3	3.8	7.4	6.2	2.1	6.2	4.9	1.18	4.82	3.61
GPS	4.4	7.5	6.4	3.6	6.0	5.2	2.0	4.7	4.1	1.35	3.54	2.93
BDS-3/GPS	9.7	15.9	13.7	7.6	13.4	11.4	4.6	10.8	8.9	2.82	8.30	6.53

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