不同星历和钟差产品的精密单点定位结果分析

Research on Results of Precise Point Positioning with Different Ephemeris and Clock Bias Products

针对由于国际全球导航系统服务网站提供的星历和钟差产品精度、采样率不同,导致最终定位结果存在差异的问题,提出了基于不同星历和钟差产品组合的精密单点定位方法,该方法利用不同产品提供的卫星坐标和卫星钟差进行精密单点定位解算,比较分析最终定位结果的稳定性和收敛速度等。研究结果表明,最终精密星历和最终精密钟差产品得到的定位精度最高,13.25min的定位误差能够收敛到10cm,1d的定位精度高于1cm;快速精密产品的定位精度相对较低,42.86min定位精度达到10cm,在N、E、U方向精度分别降低50.5%、55.9%、92.8%;超快速预报产品的收敛速度最慢,定位精度最低。钟差产品的采样率和精度对收敛速度、稳定度影响较大,星历产品精度对最终定位误差产生影响。

Due to the ephemeris and clock bias products have different accuracy provided by International GNSS （Global Navigation Satellite System） Service, the question for final positioning results are different based on them. The method of precise point positioning based on different ephemeris and clock bias products is proposed. In this method, satellite coordinates and satellite clock bias are provided by different products for precise point positioning, and the stability and convergence speed of final positioning results are compared and analyzed. The research results show that the positioning accuracy of results with final precise ephemeris and final precise clock bias products is the highest, which converges to 10cm in 13.25 minutes, and the positioning accuracy in one day is higher than lcm. The positioning accuracy of tests with rapid precise products is relatively lower, which can reach 10 cm in 42.86 minutes, and the positioning accuracy in NEU directions decreased by 50.5%, 55.9%, 92.8% respectively. The convergence speed of the result with ultra-rapid predicted products is the slowest, and the positioning accuracy is the lowest. The sampling rate and accuracy of precise clock bias have a great impact on the convergence speed and stability, and the precise of ephemeris products can affect the final accuracy of precise point positioning.