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Improving Signal in Space (SIS) Performance of BDS Junping Chen, Yize Zhang, Xiuqiang Gong, Yueling Cao, Shanshi Zhou, Sainan Yang, Xiaogong Hu, Bin Wu Shanghai Astronomical Observatory (SHAO) [email protected] http://www.shao.ac.cn/shao_gnss_ac - PowerPoint PPT Presentation
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Improving Signal in Space (SIS) Performance of BDS
Junping Chen, Yize Zhang, Xiuqiang Gong, Yueling Cao, Shanshi Zhou, Sainan Yang, Xiaogong Hu, Bin Wu
Shanghai Astronomical Observatory (SHAO)[email protected]
http://www.shao.ac.cn/shao_gnss_ac
Bo Tang, Li Liu, Rui Guo, Feng He, Xiaoli Wu, Lingfeng Zhu
Beijing Satellite Navigation Center
22
Content
Background & motivation
Challenges in BDS performance improvement
Signal in Space (SIS) performance improvement of BDS
Design of demonstration system
Summary
33
Background & motivation
>30 GPS>24 GLONASS14 BDS6 Galileo1 QZSS
Interoperability: improve space coverageCompatibility: frequency compatibility and non-interference
David Turner, 2013
44
Background & motivationSIS performance improvement :GPS
Harold Martin, 2014
David Turner, 2013
55
Background & MotivationSIS performance improvement: GLONASS
Grigory Stupak,2013
Sergey Revnivykh， 2011
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Background & MotivationSIS performance improvementBDS: constellation & positioning
Number of visible satellitesYang et al, 2014
URE
77
Challenges in BDS performance improvementTracking networkRegionally distributed only
IGS MGEX network
Chinese regional network
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Challenges in BDS performance improvementData qualitySevere multipath effects
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Challenges in BDS performance improvementGEO satellites
Orbit overlap
IGSO,MEO satellites
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BDS SIS performance improvementOrbitsSolar radiation model, satellite altitude model and arc connection
1111
BDS SIS performance improvement
定轨比较
0. 00
0. 10
0. 20
0. 30
0. 40
0. 50
0. 60
0. 70
0. 80
卫星编号
URE 米 策略二
策略三策略四
OrbitsImprovement after POD strategy refinement: 20% in average, Maximum 75%;
1212
BDS SIS performance improvementBroadcast clocksSatellite clock in broadcast is aligned to TS; The clock differences between POD and TS show periodical signals
User positioning improvement after broadcast model refinement. 3D 22%-59%, 44% in average
1313
BDS SIS performance improvementIonosphere modelCurrent model uses 3-order polynomials for amplitude fitting, does not fit to real estimation; tracking network all in north hemisphere
131313
BDS SIS performance improvement
GPSK-8
BDS P8
Real estimates
Case 1 Case 2 Case 3 Case 4RMS(TECU) 7.8 5.3 3.4 2.9
Ionosphere modelModify the function of amplitude; Adding simulated VTECs in south Hemisphere
14
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BDS SIS performance improvementIonosphere GridsAvailability improved by implementing background ION model and introducing GPS data
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BDS SIS performance improvementAugmentation system correctionsOrbit corrections; improving SIS in satellite maneuver;
Improving PVT performance for regions with few tracking stations.
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BDS SIS performance improvementAugmentation system correctionsPseudo-range based corrections: large noiseRange-phase combined corrections: smooth and small noise
1818
BDS SIS performance improvementAugmentation system correctionsRange-phase combined corrections
基准站
O-C残差
未知站 O-C残差 新的 O-C 残差
未知站坐标
最小二乘
1919
BDS SIS performance improvementSISA & Integrity monitoringSISRE, URA, SISA (GPS,BDS)SISA is more close to real SIS performance
2020
BDS SIS performance improvementSISA & Integrity monitoringRAIM: System integrity monitored at tracking stations using Parity method.
Detection Identifying
2121
BDS SIS performance improvementSISA & Integrity monitoringRAIM: System integrity monitored at tracking stations using Parity method.
PRN 14 21 16 31 3ri 6.66 12.14 15.59 8.49 1.13PRN 18 22 6 30ri 9.17 18.91 3.41 38.40
24.35rT
2011 5 14 6:00, COCO / ( 4) 17.23SSET F n 12.42DT >
Detection
Identifying
2222
Design of demonstration system
22
北斗卫星导航系统卫星北斗卫星导航系统卫星
各种观测数据、导航电文信息
新计算的导航电文参数
北斗卫星导航系统地面控制中心
空间信号精度提升试验平台
测试终端提升
数据交互与融合系统
信息处理系统
数据发送
导航电文参数控制
服务器一
数据收发分系统
通用服务软件
监控管理分系统
精密定轨计算软件
时间同步计算软件
电离层模型计算软件
差分完好性计算软件
服务器二
数据收发分系统
数据存储分系统
监控管理分系统
精度验证分系统
测试终端提升
测试终端提升
北斗卫星导航系统现有设备
课题1改造北斗卫星导航系统设备
课题1新研系统及设备
图例说明
课题2研制新研设备
空间信号精度提升试验验证示范系统
Demonstration system
SIS performance improvement platform
23
PlatformPlatform and analysis
http://www.shao.ac.cn/shao_gnss_ac
24
AnalysisPrototype analysis
BDS PPP with cm accuracy
1.2cm E-W,3.3cm N-S,4.5cm Height
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SummaryChallenges in BDS SIS performance improvement
Proposals for BDS SIS performance improvement
We are aiming at improving BDS SIS performance with the goal of decimeter meter UDRE and 1 meter level UERE.
Demonstration system
2626
Thank you!Thank you!
Acknowledgment: 863 projects (No. 2013AA122402,2014AA123102)
NSFC project (No. 11273046)
http://www.shao.ac.cn/shao_gnss_ac
