【摘要】 针对GPS在城市高楼密集区、矿山以及深山峡谷等区域,所跟踪的可见星数目少和几何分布不佳导致定位精度下降以及GPS在垂直方向定位精度较差等问题,提出伪卫星增强GPS定位方法,利用GPS和伪卫星组合观测量,提高区域定位精度。从伪卫星和GPS组合模型入手,重点研究伪卫星多路径效应误差的估算方法。实测数据进行处理与分析的结果表明,所提出的方法能有效地减弱伪卫星多路径效应产生的误差,提高系统的定位精度,特别是垂直方向的精度。更多还原

【Abstract】 Many survey conditions such as urban canyons, deep open-pit mines and valleys, limit the number and geometry distribution of visible satellites, which degrades the survey accuracy and give bad positioning precision in vertical direction. The technique of Pseudolites (PL) augmented GPS is provided in this paper in order to strengthen the area positioning precision. Base on the combination model of PL augmented GPS, study the error estimation of PL multipath effect. The result received by dealing with the data of real observations demonstrates that the developed methodology effectively reduced the error caused by PL multipath effect, also improved survey accuracy, in particular the accuracy of a vertical direction.更多还原