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Precise point positioning (PPP) technology for satellite navigation has received considerable attention because of its wide area coverage, uniform accuracy, and small number of ground reference sites. The use of satellite-based broadcasting technique enables the realization of PPP at the globe, even for users on the oceans. However, due to limited and valuable satellite downlink resources, the optimal design of satellite-based broadcasting message is of great significance. In this study, the influences of some key factors on the accuracy loss of products are analyzed, including the PPP message broadcasting interval, the message data bit width, and the scale factor. On this basis, the effect on the final positioning accuracy of the user is evaluated. Broadcasting design ideas and suggestions for major augmentation products, including Global Navigation Satellite System satellite orbits and clock corrections, through a simulation calculation based on a precise ephemeris are given, thereby providing references for the optimal design of satellite-based augmentation PPP service messages.

Analysis of Key Problems in the Optimal Design of Satellite-based Precise Point Positioning Messages