Improving Signal in Space (SIS) Performance of BDS
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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

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Improving Signal in Space (SIS) Performance of BDS

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Improving signal in space sis performance of bds

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


Improving signal in space sis performance of bds

Content

  • Background & motivation

  • Challenges in BDS performance improvement

  • Signal in Space (SIS) performance improvement of BDS

  • Design of demonstration system

  • Summary

2


Improving signal in space sis performance of bds

Background & motivation

  • >30 GPS

  • >24 GLONASS

  • 14 BDS

  • 6 Galileo

  • 1 QZSS

  • Interoperability: improve space coverage

  • Compatibility: frequency compatibility and non-interference

  • David Turner, 2013

    3


    Improving signal in space sis performance of bds

    Background & motivation

    • SIS performance improvement :GPS

    Harold Martin, 2014

    David Turner, 2013

    4


    Improving signal in space sis performance of bds

    Background & Motivation

    • SIS performance improvement: GLONASS

    Sergey Revnivykh,2011

    Grigory Stupak,2013

    5


    Improving signal in space sis performance of bds

    Background & Motivation

    • SIS performance improvement

    • BDS: constellation & positioning

    URE

    Number of visible

    satellites

    Yang et al, 2014

    6


    Improving signal in space sis performance of bds

    Challenges in BDS performance improvement

    • Tracking network

    • Regionally distributed only

    IGS MGEX network

    Chinese regional network

    7


    Improving signal in space sis performance of bds

    Challenges in BDS performance improvement

    • Data quality

    • Severe multipath effects

    8


    Improving signal in space sis performance of bds

    Challenges in BDS performance improvement

    • GEO satellites

    • IGSO,MEO satellites

    Orbit overlap

    9


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • Orbits

    • Solar radiation model, satellite altitude model and arc connection

    10


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • Orbits

    • Improvement after POD strategy refinement: 20%in average, Maximum 75%;

    11


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • Broadcast clocks

    • Satellite 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

    12


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • Ionosphere model

    • Current model uses 3-order polynomials for amplitude fitting, does not fit to real estimation; tracking network all in north hemisphere

    13

    13

    13

    13


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • Ionosphere model

    • Modify the function of amplitude; Adding simulated VTECs in south Hemisphere

    Real estimates

    GPSK-8

    BDS P8

    14


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • Ionosphere Grids

    • Availability improved by implementing background ION model and introducing GPS data

    15


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • Augmentation system corrections

    • Orbit corrections; improving SIS in satellite maneuver;

    Improving PVT performance for regions with few tracking stations.

    16


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • Augmentation system corrections

    • Pseudo-range based corrections: large noise

    • Range-phase combined corrections: smooth and small noise

    17


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • Augmentation system corrections

    • Range-phase combined corrections

    18


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • SISA & Integrity monitoring

    • SISRE, URA, SISA (GPS,BDS)

    • SISA is more close to real SIS performance

    19


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • SISA & Integrity monitoring

    • RAIM: System integrity monitored at tracking stations using Parity method.

    Detection

    Identifying

    20


    Improving signal in space sis performance of bds

    BDS SIS performance improvement

    • SISA & Integrity monitoring

    • RAIM: System integrity monitored at tracking stations using Parity method.

    Detection

    >

    2011514 6:00, COCO

    Identifying

    21


    Improving signal in space sis performance of bds

    Design of demonstration system

    • Demonstration system

    SIS performance improvement platform

    22

    22


    Improving signal in space sis performance of bds

    Platform

    • Platform and analysis

    • http://www.shao.ac.cn/shao_gnss_ac

    23


    Improving signal in space sis performance of bds

    Analysis

    • Prototype analysis

      • BDS PPP with cm accuracy

      • 1.2cmE-W,3.3cmN-S,4.5cmHeight

    24


    Improving signal in space sis performance of bds

    Summary

    • Challenges 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

    25


    Improving signal in space sis performance of bds

    Acknowledgment: 863 projects

    (No. 2013AA122402,2014AA123102)

    NSFC project (No. 11273046)

    http://www.shao.ac.cn/shao_gnss_ac

    Thank you!

    26


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