Global differential GNSS positioning and navigation

由于对更多用户性能和应用的需求不断增加，全球导航卫星系统(GNSS)目前正处于快速发展阶段。这包括全球定位系统的现代化、GLONASS系统的重建以及目前正在开发的新伽利略系统。本研究提出了一种全球导航卫星系统(GDGNSS)定位系统，该系统利用全球有效的GNSS卫星轨道和时钟校正，使用单个GNSS接收器进行厘米到分米级别的实时精确位置确定。除了在操作灵活性和成本效益方面与其他差分定位技术相比具有几个显著优势外，该系统还可以显著提高当前仅限GPS的全球差分定位系统的可用性和可靠性。将开展的主要研究任务包括：a)调查全球定位系统、全球导航卫星系统和伽利略观测中的误差/偏差源；b)分析精密全球导航卫星系统产品的质量和误差特征；c)开发全球差分全球导航卫星系统定位方法和算法；d)研究快速位置收敛和模糊度解算技术；e)研究惯性辅助全球导航卫星系统定位增强；以及f)系统实施和性能分析。

Due to the insatiable demand for additional user performance and applications, Global Navigation Satellite System (GNSS) is currently under rapid development. This includes the GPS modernization, the reconstitution of the GLONASS system, and the new Galileo system currently under development. A global differential GNSS (GDGNSS) positioning system has been proposed in this research which applies globally valid GNSS satellite orbit and clock corrections to conduct real-time precise position determination at centimeter to decimeter level using a single GNSS receiver. In addition to several significant advantages compared to other differential positioning techniques in terms of operational flexibility and cost-effectiveness, the proposed system can significantly improve the availability and reliability of current GPS-only global differential positioning systems. The major research tasks to be conducted include: a) investigation of the error/bias source in GPS, GLONASS and Galileo observations; b) analysis of the quality and error characteristics of precise GNSS products; c) development of global differential GNSS positioning methods and algorithms; d) investigation of fast position convergence and ambiguity resolution techniques; e) investigation of inertial aided GDGNSS positioning enhancement; and f) system implementation and performance analysis.