Galileo Signal and Positioning Performance Analysis Based on Four IOV Satellites

Galileo Signal and Positioning Performance Analysis Based on Four IOV Satellites
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基于四颗车联网卫星的伽利略信号及定位性能分析

DOI:
10.1017/s037346331400023x
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发表时间:
2014-04
影响因子:
2.4
通讯作者:
Xiao, Qinqin
Xiao, Qinqin
中科院分区:
工程技术3区
文献类型:
--
作者:
Cai, Changsheng;Luo, Xiaomin;Liu, Zhizhao;Xiao, Qinqin

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随着四颗在轨验证(IOV)卫星的伽利略信号的可用性,仅用伽利略观测进行定位已经成为可能,这使我们能够评估其定位性能。从载波噪声密度比(C/N 0)、伪距多径(包括噪声)、伽利略广播卫星轨道和卫星钟差、单点定位(SPP)精度等方面对Galileo系统在Galileo单模式和GPS/Galileo组合模式下的性能进行了评估。广播星历数据的精确度是以慕尼黑工业大学天文和物理大地测量研究所(IAPG/TUM)的精确卫星轨道和时钟产品为参考进行评估的。使用不同类型GNSS接收机的数据集估计GPS-Galileo时间偏移(GGTO),结果表明不同接收机类型之间存在系统偏差。定位解决方案表明,伽利略唯一的SPP可以实现约6米的三维位置精度。与仅使用GPS的解决方案相比,Galileo和GPS数据的整合可以将垂直分量的定位精度提高约10%。
With the availability of Galileo signals from four in-orbit validation (IOV) satellites, positioning with Galileo-only observations has become possible, which allows us to assess its positioning performance. The performance of the Galileo system is evaluated in respect of carrier-to-noise density ratio (C/N0), pseudorange multipath (including noise), Galileo broadcast satellite orbit and satellite clock errors, and single point positioning (SPP) accuracy in Galileo-only mode as well as in GPS/Galileo combined mode. The precision of the broadcast ephemeris data is assessed using the precise satellite orbit and clock products from the Institute of Astronomical and Physical Geodesy of the Technische Universität München (IAPG/TUM) as references. The GPS-Galileo time offset (GGTO) is estimated using datasets from different types of GNSS receivers and the results indicate that a systematic bias exists between different receiver types. Positioning solutions indicate that Galileo-only SPP can achieve a three-dimensional position accuracy of about six metres. The integration of Galileo and GPS data can improve the positioning accuracies by about 10% in the vertical components compared with GPS-only solutions.
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