天线相位中心改正模型对PPP参数估计的影响

Influcence of Antenna Phase Center Correction Model on Precise Point Positioning

比较了IGS发布的相对天线相位中心改正模型与绝对天线相位中心改正模型,分析了两种不同模型对精密单点定位(PPP)参数估计的影响。结果表明,采用不同的天线相位中心改正模型,天顶对流层延迟(ZPD)的估值存在5mm左右的差异,接收机钟差参数存在3ns左右的差异,估计的测站坐标高程方向有1cm左右的差异。使用绝对天线相位中心模型估计得到的ZPD精度优于5mm,高程方向定位精度约为1cm,接收机钟差估计的精度达0.1ns。

Both the relative and absolute models of antenna phase center（IGS_01 and IGS05） are described.Influence of these two models on PPP estimation,including coordinates,Zenith path delay（ZPD） and receiver clock biases are analyzed.Results show that the difference of ZPD estimates is about 5 mm,and that of estimated receiver clock bias and height of site is relatively around 3 ns and 1 cm,respectively,based on different antenna phase center models.In addition,with the absolute model,the accuracy of PPP-derived ZPD is better than 5 mm,and the horizontal positioning accuracy arrives at 1 cm,while the accuracy of estimated clock bias is about 0.1 ns.