基于单站的硬件延迟求解方法

METHODS FOR ESTIMATION OF DIFFERENTIAL CODE BIASES BY USING SINGLE STATION GPS MEASUREMENTS

利用2004年11月磁暴及磁平静期间不同纬度上的IGS站(包括并置站)的GPS双频数据,分别采用最小二乘法和所有视线上TEC标准差最小法解算接收机硬件延迟,计算结果表明,两种方法得到的结果与IGS公布的结果基本一致,说明这两种方法都可以有效地解算单站GPS的接收机硬件延迟。同时,接收机硬件延迟在磁暴期间没有发生剧烈波动,并置站的硬件延迟变化也没有明显相关性,说明接收机本身的性能对硬件延迟的影响远大于电离层状态信息的影响。

On the basis of the GPS observations in Nov. 2004 at IGS stations which are distributed in different latitudes, two methods ： least square and minimization of standard deviation of TEC at all lines of sight were used to calculate the DCB of receivers. The results were compared with corresponding values published by IGS （Internation al GNSS Service） and the variations of DCB were analyzed. It shows that these methods can be used to derive DCB and the accuracy is sufficient. Meanwhile, in DCB there are not apparent fluctuation during magnetic storm and apparent correlations with that at concatenation stations but there is close relation to receiver＇ s property. It shows that the influence of receivers themselves on DCB is much greater than that from ionosphere condition.