Precision Analysis of Single Point Positioning Model with GPS／GLONASS／BDS

 GNSS pseudorange point positioning speed and there is no ambiguity problem, its principle is simple and easy to realize, so in GNSS data processing, this method is often used. Based on GPS, GLONASS, BDS multimode as an example, introduces the existing multimode coordinate unification, unified time benchmark problem then introduces the pseudorange point positioning principle and calculation model, based on the Visual Studio2010 platform, written in GPS, GLONASS, BDS multimode pseudorange single point positioning procedures and absolute velocity determination. Combined with relevant examples,pseudorange point positioning accuracy and absolute velocity determination were analyzed.