GPS/GALILEO组合系统观测数据的模拟

Simulation of integrated GPS/GALILEO observation data

针对因无法得到GALILEO原始观测数据而限制了对GPS/GALILEO组合定位深入研究的问题,通过分析GALILEO卫星运动情况,仿真出GALILEO卫星历书文件;参照GPS定轨定位中的主要误差,分别采用Klobuchar模型和Hopfield模型对电离层和对流层误差进行了模拟。利用已知任意历元卫星的三维位置,恢复该历元卫星可观测到的卫星信号,最后生成RINEX观测文件。生成的GPS/GALILEO数据能够较好地反映出观测的实际情况,为GPS/GALILEO组合定位的研究提供了数据基础。

At present, we can not get the Galileo raw observation data, and this limits the further study on GALILEO positioning. In order to solve this problem, the paper analyzes the motion of GALILEO satellites, and simulates the almanac of Galileo satellites. Klobuchar model and Hopfield model are adopted respectively to compute the ionosphere and troposphere delay based on the hypothesis that the GALILEO system and GPS have similar errors. Finally, the raw observation data was generated by computing the pseudorange and carrier phase observations of visible satellites. The simulated GPS/GALILEO observation data shows the actual situation of observation basically, which will contribute to the research on GPS/GALILEO navigation and positioning algorithm.