天线相位中心偏差变化及改正模型对精密单点定位精度的影响

STUDY ON IMPACT OF ANTENNA PHASE CENTER OFFSETS,VARIATION AND THEIR CORRECTION MODELS ON GPS PRECISE POINT POSITIONING ACCURACY

利用精密单点定位程序对IGS站的实测数据进行计算,结果表明:平面方向,天线相位中心偏差和变化对精密单点定位精度影响较小;高程方向,天线相位中心偏差可造成厘米级的影响,天线相位中心变化的影响约5mm;相比相对天线相位中心改正模型,使用绝对相位改正模型具有更多优点,尤其用于高精度GPS授时其精度明显提高。

Firstly,the methods and models for correcting antenna phase center offsets（PCO） and phase center variations（PCV） in high-accuracy GPS positioning are introduced,then using precise point positioning procedures the measured data of IGS stations are calculated and analyzed.The results show that in horizontal direction,PCO and PCV less influence on precise point positioning precision,while in elevation direction,PCV brings about cm level effect and the effect of PCO is in 5 mm.Compared with the relative antenna phase correction model,the absolute phase correction model has more advantages,especially in high precision GPS clocking.