KEYWORDS: Doppler effect, Satellites, Satellite navigation systems, Smoothing, Global Positioning System, Earth observing sensors, Receivers, Data analysis, Statistical analysis, Signal to noise ratio
GNSS (Global Navigation Satellite System) technology not only in the general field of surveying and mapping, geology,
mining, water and electricity, and in particular in the field of public security, fire protection, tourism, search and rescue,
adventure have been more widely used. These special areas require real-time and high positioning accuracy. Currently,
GNSS precision positioning technology has become a hot research direction. This paper introduced an algorithm of
smoothing pseudo range by Doppler based GPS/BD, to improve GNSS positioning precision. This algorithm decoded
the pseudo range data and ephemeris data, and then designed algorithm of smoothing pseudo range by Doppler
according principle of Doppler smoothing pseudo range. This algorithm was realized by C++ and proved its efficiency.
At last, this algorithm has proved its correctness through calculating and analyzing practical Doppler and pseudo range
data, and then a conclusion has been obtained: the Doppler value precision is sub-meter, far better than the pseudo-range
accuracy, so that if the two data are combined to calculate position that can help to improve the positioning accuracy.
With the rapid development of modem technology, the digital information management and the virtual reality simulation technology has become a research hotspot. Virtual campus 3D model can not only express the real world objects of natural, real and vivid, and can expand the campus of the reality of time and space dimension, the combination of school environment and information. This paper mainly uses 3ds Max technology to create three-dimensional model of building and on campus buildings, special land etc. And then, the dynamic interactive function is realized by programming the object model in 3ds Max by VRML .This research focus on virtual campus scene modeling technology and VRML Scene Design, and the scene design process in a variety of real-time processing technology optimization strategy. This paper guarantees texture map image quality and improve the running speed of image texture mapping. According to the features and architecture of Guilin University of Technology, 3ds Max, AutoCAD and VRML were used to model the different objects of the virtual campus. Finally, the result of virtual campus scene is summarized.
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