Application Study on Expansion of Pseudo-range Differential Technique

The pseudo-range differential technique enjoys the most extensive utilization at present,which is able to offset the common error of two base reference stations but fails to eliminate the system error as a result of increased distance between stations.As such,it is proposed to group a differential reference station with one or more main stations into an expanded differential GPS that not only expands the effective work scope of differential GPS but also ensures positioning accuracy.