METHODS FOR ESTIMATION OF DIFFERENTIAL CODE BIASES BY USING SINGLE STATION GPS MEASUREMENTS
基于单站的硬件延迟求解方法

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 (International 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.