Abstract:In this paper, GPS-based mobile measurement system is introduced including the hardware and the architecture of the system based on Internet/Intranet. The measurement system has bee applied in Australian Network and successfully extracted the oscillatory frequency and damming values of the power system. Results from the analysis show that the angle measurement system is able to be used to record the variation of phase angle of the power system thus to carry out the post-event analysis of the incident of the power system successfully and extracting oscillation of the system in real-time.