双差精密定轨中地面站的选取方法

针对目前全球的地面测站数量多、测站观测数据质量参差不齐及测站地理分布不均的问题，总结了一种测站选取方法。利用该方法编制的测站选取软件对IGS站进行了选择，并根据选得的测站设计了几种定轨试验。结果显示，利用由本文的测站选取方法得到的70个基准站进行定轨时，得到的卫星位置与IGS精密星历在径向、切向、法向偏差均方根分别为1.11、2.19、1.72cm。验证了本文选站软件的可靠性，避免了选站过程中过多的人为因素，并且在保障精度的前提下提高了定轨效率。

The Method of Selecting the Ground Station in Double Difference Orbit Determination

Aiming at the problem that there are a lot of ground stations in the world,the uneven quality of the observation stations and the uneven distribution of the stations,this paper summarizes a method of selecting the stations.Based on the method,the station selection software is used to select the IGS stations,and several orbit determination experiments are designed.Results show that the use of station selection method to get 70 base station orbit,the satellite position and IGS precise ephemeris in the radial,tangential and normal rms deviation are respectively 1.11,2.19,1.72 em.In this paper,the reliability of the selected station software is verified,and the excessive human factors in the process of selecting stations are avoided.