Global differential GNSS positioning and navigation

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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.