Design and Verification of Data Service System for Wide Area Real-time Precise Positioning
Wide area real-time positioning technology provides space-time reference for mobile Internet and Internet of things. This paper introduces the related framework and core algorithm of the enhanced message service system in wide area real-time positioning: 1) We designed a low redundancy and temporal / spatial adaptive enhance message encoding and transmission protocol. It compresses and transmits precise ephemeris,satellite clock correction data based on the interception significant bits and using hierarchical grid discretization methods to broadcast ionosphere corrections in a spatial and temporal adaptive way. 2) We also designed a multi-level data broadcast mechanism based on a virtualized flexibility scheduling,improving the system reliability through the dynamic recourse allocation and expansion algorithm. 3) We verified the quality of the service system through a series of precise positioning experiment in urban environment. We analyzed the effect of network signal,geographical environment and visibility condition on precise positioning service.