Advanced Algorithm Development for Real-time Kinematic Precise Point Positioning

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Application of precise point positioning (PPP) in real-time kinematic (RTK) mode faces several significant challenges that must be addressed in order to meet application need and to realize its great commercial value. PPP currently requires a long convergence time (typically tens of minutes) before its float solution can reach the decimeter precision. For PPP to provide cm accurate solution the integer ambiguities of its phase measurements must also be resolved but this currently requires a very long initialization time. A lack of a high level of reliability for its solution is another limiting factor for its commercial applications.The objective of this proposed research is to develop advanced algorithms to address the above challenges. The major outcomes of this research project includes new algorithms to make decimeter accurate PPP solution possible without a convergence period and cm accurate PPP solution obtainable in seconds rather than the current tens of minutes. New quality control and reliability assurance methods will also be developed which is critical for real-time applications. These developments will be significant advances over current RTK systems, resulting significant economic impacts on precise positioning and navigation industry. The new algorithms will extend the use of GNSS to many new applications that cannot be cost-effectively or practically supported by existing techniques.