Performance evaluation of GPS augmentation using Quasi-Zenith Satellite System
Performance evaluation of GPS augmentation using Quasi-Zenith Satellite System
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DOI：
10.1109/taes.2004.1386878
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发表时间：
2004-10
影响因子：
4.4
通讯作者：
Falin Wu;N. Kubo;Akio Yasuda
中科院分区：
文献类型：
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作者：
Falin Wu;N. Kubo;Akio Yasuda
目前的全球定位系统（GPS）的可用性和能力有限，因为像日本这样的国家，山区地形和城市峡谷不允许清晰的天际线到地平线。目前，日本准天顶卫星系统（QZSS）正在接受政府和民间合作的调查。QZSS被认为是一个多功能卫星系统，因为它能够以高仰角为指定区域的移动用户提供通信、广播和定位服务。QZSS附加的GPS兼容信号可以显著提高GPS定位的可用性、精度和能力。本研究的重点是利用所提出的QZSS增强GPS的性能。简要介绍了QZSS卫星星座和信号结构。讨论了基于伪距离和载波相位的定位方法。通过软件仿真研究了QZSS在亚太和澳大利亚地区的GPS增强性能。结果使用可见卫星的数量作为可用性的度量，GDOP作为精度的度量，模糊成功率作为具有空间和时间变化的基于载波相位的定位能力的度量。结果表明，QZSS不仅可以提高GPS定位的可用性和精度，还可以增强日本及周边地区GPS载波相位定位的能力。
The current global positioning system (GPS) provides limited availability and capability for a country like Japan where mountainous terrain and urban canyons do not allow a clear skyline to the horizon. At present, the Japanese Quasi-Zenith Satellite System (QZSS) is under investigation through a cooperative effort between the government and the private sector. QZSS is considered a multi-function satellite system, as it is able to provide communication, broadcasting, and positioning services for mobile users in a specified region with a high elevation angle. The additional GPS compatible signals from QZSS can remarkably improve the availability, accuracy, and capability of GPS positioning. This work focuses on the performance of GPS augmentation using the proposed QZSS. The QZSS satellite constellation and signal structure are briefly reviewed. Positioning with pseudo-range and carrier phase are discussed. The performance of GPS augmentation using QZSS in the Asian-Pacific and Australian area is studied using software simulations. The results are presented using the number of visible satellites as a measure of availability, GDOP as a measure of accuracy, and ambiguity success rate as a measure of capability of carrier-phase-based positioning with spatial and temporal variations. The results show that the QZSS will improve not only the availability and accuracy of GPS positioning, but will also enhance the capability of the GPS carrier-phase-based positioning in Japan and neighboring regions.