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Performance evaluation of GPS augmentation using Quasi-Zenith Satellite System

机译：利用准天顶卫星系统进行GPS增强的性能评估

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摘要

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.
机译：当前的全球定位系统（GPS）为像日本这样的国家提供了有限的可用性和功能，在日本这样的山区和城市峡谷无法使地平线清晰。目前，通过政府与私营部门之间的合作，正在研究日本准天顶卫星系统（QZSS）。 QZSS被认为是多功能卫星系统，因为它能够为高仰角的指定区域中的移动用户提供通信，广播和定位服务。来自QZSS的其他GPS兼容信号可以显着提高GPS定位的可用性，准确性和功能。这项工作着重于使用提出的QZSS进行GPS增强的性能。简要回顾了QZSS卫星星座图和信号结构。讨论了伪距和载波相位定位。使用软件仿真研究了使用QZSS在亚太地区和澳大利亚地区进行GPS增强的性能。使用可见卫星的数量作为可用性的度量，使用GDOP作为准确性的度量以及使用歧义成功率作为基于载波相位的时空变化能力的度量来呈现结果。结果表明，QZSS不仅将提高GPS定位的可用性和准确性，还将增强日本及周边地区基于GPS载波相位的定位能力。

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