This article analyses current GPS difference technology and puts forward a difference position technology which can apply in BEIDOU system for improving the position precision.

Multipath error is a main influence on high-precision GPS dynamic deformation monitoring results as it is difficult to be mitigated by difference observation in most of applications.

We can enlarge the range of mapping region by utilizing CDMA wireless data transmission in transporting GPS difference data, and realize high precision orientation of real time.