High Precision GNSS Data Processing And Key Algorithms Reaserch

With the modernization and rapid development of GPS, GLONASS, GALILEO especially BDS satellite navigation system and positioning technology, this makes multi-system combination positioning become a hot reseach topic. Especially in recent years, the rapid construction of BDS satellite navigation and positioning system, as well as the realized of Asia-Pacific region navigation services. Promote the development and construction of multi-GNSS navigation positioning service. The research and development of multi-GNSS data fusion, the methods of data processing and the data processing software has become a hot spot in the field of satellite navigation.The procedure of multi-GNSS data processing compare with single system have more complicate factors to be considered. This is mainly due to the integrated satellite navigation positioning system data processing have to take differences in terms of frequency, time and space between different satellite navigation system. In this paper, the multi-GNSS data processing that need attention aspects were analyzed as follow: 1. Comparative analysis the exist differences and compatibility issues in frequency, time and space of the GPS, GLONASS, GALILEO and BDS four satellite navigation system, and analyze the conversion methods of the reference time and space of the different satellite navigation system. 2. Analysis the GNSS data processing error source and the corresponding correction methods, and experimental the part of error terms, compared the results of before and after added the correction model of the data processing, analysis the influence for the precise point positioning of each correction model; 3. The detection and repair of cycle slip and the ambituity resolution of multi-GNSS data processing were analyzed. Details introduction of the method of which consideration of the uncalibrated phase delay ambiguity resolution. 4. Last paper, compared the difference between the combination observations and a single observation for static and dynamic GNSS data processing through experiments. Respectively, in the static experiments shows that the difference between both precise point positioning accuracy are less obvious, but in dynamic positioning due to the increase number of visible satellite makes that the single point positioning accuracy has a obvious improvement, especially in the case of external observation conditions are relatively poor, the improvement of precise point positioning accuracy is particularly evident.