Real-time precise point positioning utilising the Japanese quasi-zenith satellite system (QZSS) LEX corrections

摘要: The Quasi-Zenith Satellite System (QZSS) is a Japanese regional satellite navigation system (when fully deployed) consisting of several QZSS satellites in highly inclined elliptical orbits. This means that at least one constantly located high angle elevation, which gives rise to the term 'quasi-zenith'. satellite-based augmentation for GPS and Galileo constellations, capable transmitting signals are compatible interoperable with both these Global Navigation Systems (GNSS). In addition signals, also transmits e.g. L-band Experimental (LEX) signal on E6b frequency. LEX unique delivers correction messages - such as orbits clock information enable Precise Point Positioning (PPP) real-time applications. aim this research was evaluate availability well quality broadcast PPP. tested static kinematic positioning mode Melbourne early March 2013. results show 60% when elevation 30o; above 90% 40o elevation. PPP estimates using current limited by accuracy clocks transmitted signal. achievable corrections decimetre level.