Study on the Method of Accuracy Improvement for High Precision Satellite-based Positioning System using Geospatial Data

由于GPS、GLONASS、QZSS和伽利略等卫星的嵌入，卫星数量增加，定位变得过多。假设当接收机接收到含有大误差的卫星无线电波时，由于传播的多径和时延，定位精度会下降。为了预测各个卫星信号在观测点上的距离误差，利用观测点位置、周围障碍物和各颗卫星之间的关系，对多路径探测方法进行了理论和实验研究。在此基础上，提出了剔除含有多路径的卫星波并考虑卫星几何组合的卫星定位计算选星方法。

The number of satellites has been increased and has become excessive for positioning by insatllation of satellites such as GPS, GLONASS, QZSS and Galileo. It is assumed that the positioning accuracy will decline when the receiver receives the satellite radio wave containing the large amount of error due to the multipath and delay of propagation. In order to predict the range error of each satellite signal on the observation point, the detection method of multipath has been investigated theoretically and empirically using the relationship of location of observation point, surrounding obstacles and each satellite. As a result, the method to select the satellite for positioning calculation has been developed by excluding the satellite wave containing multipath and by considering the geometrical combination of satellites.