基于伪卫星的改善GPS几何精度因子的研究

随着人们活动范围的日益扩大和周边环境的日益复杂,高精度GPS导航技术逐渐成为国内外研究的重点。GPS系统的定位精度在很大程度上取决于参与定位卫星的数目和几何布局,而几何精度因子(GDOP)正是衡量定位卫星几何布局优劣的量度。文章从几何精度因子着手,从理论上证明了伪卫星对GPS系统GDOP的改善,分析了伪卫星数量对GPS系统定位精度的影响。借助于仿真实验,结果表明,在GPS导航定位中,伪卫星能够显著增强卫星几何图形结构、提高测量精度、改善精度因子从而提高定位精度。

Research on improving GPS geometric dilution of precision by pseudolite

GPS has been broadly applied in every fields of our social life.Since the environment around us has been becoming more and more complicated,high precision GPS navigation technology gains more and more attention.As well know,such performance as accuracy of satellite-based positioning system is heavily dependent on the number and geometric distribution of satellites being tracked,and GDOP is a right measure of the geometry of the constellation.Therefore,in the paper,from the viewpoint of geometric dilution of precision,the improvement of pseudolite to GDOP of GPS positioning system was researched,and the influence of pseudolite number to GPS system positioning accuracy was analyzed in details.With the help of simulation,it shows that pseudolite can dramatically augment satellites geometric structure,and improve measurement accuracy and dilution of precision.Pseudolite can ultimately improve positioning accuracy on GPS navigation and positioning.