Evaluation of Positioning Performance using the GPS + QZSS in Shanghai

Evaluation of Positioning Performance using the GPS + QZSS in Shanghai
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上海GPS QZSS定位性能评估

DOI:
10.2322/tjsass.57.1
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发表时间:
2014-01
期刊:
Transactions of the Japan Society for Aeronautical & Spaceences
影响因子:
--
通讯作者:
Akio Yasuda
Akio Yasuda
中科院分区:
其他
文献类型:
--
作者:
Yun Zhang;Yongming Liu;Zhonghua Hong;ChunMing Fan;Akio Yasuda

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全球定位系统(GPS)在大都市地区的性能可能会很差,因为那里对卫星信号有严重的阻塞效应。不同的定位系统组合将增加可见卫星的数量并增强卫星几何结构的强度。日本宇宙航空研究开发机构(JAXA)证实,第一颗准天顶卫星(QZS)“MICHIBIKI”于2011年6月22日(JST)开始提供定位信号。QZS系统(QZSS)能够提供兼容的信号,与GPS具有较好的互操作性。因此,我们使用两个系统的集成来验证定位性能的变化。为了验证所提方法的定位精度,利用上海地区的实际观测数据,对GPS系统和GPS + QZSS系统的定位性能进行了评估。利用可见卫星数(NVS)、位置精度稀释(PDOP)和均方根(RMS)三个指标来评价定位性能。同时,利用QZSS增强GPS可以提高高仰角掩模下的定位性能。在45度时,定位的可用性增加了30%以上,在第3天增加了64%。使用GPSþ QZSS性能更稳定。
The Global Position System (GPS) may have poor performance in metropolitan areas where there is a terrible blocking effect for satellite signals. A different positioning system combination will increase the number of visible satellites and enhance the strength of the satellite geometry. The Japanese Aerospace Exploration Agency (JAXA) confirmed that the first quasi-zenith satellite (QZS) ‘‘MICHIBIKI’’ began providing positioning signals on June 22, 2011 (JST). The QZS system (QZSS) can provide compatible signals and has a better interoperability with GPS. Therefore, we used integration of the two systems to verify the changes in positioning performance. To demonstrate the positioning accuracy of the proposed methods, evaluations of the positioning performance using only the GPS system and the GPSþ QZSS system are conducted using real observation data in Shanghai. Three indicators are used to evaluate the positioning performance: the number of visible satellites (NVS), position dilution of precision (PDOP), and root mean square (RMS). Meanwhile, the results show that GPS augmentation using the QZSS improves the positioning performance for high elevation mask angles. Positioning availability increases more than 30% at 45 degrees, and by as much as 64% on day 3. The performance is more stable using the GPSþ QZSS.
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