Data sharing and positioning analysis for GPS on Every Roof

Abstract

GPS on Every Roof is a system for visualizing displacement distribution immediately after large earthquake. In this system, the sensor node which has a L1 GPS receiver and wireless sensor module shares raw GPS data between neighboring sensor nodes locally and estimates the relative positions from them. The server machine collects the estimated relative positions via wireless sensor network and connects the relative positions properly to determine the whole sensor node location. This paper presents the appropriate method of data sharing and relative positioning for GPS on Every Roof which suppresses amount of wireless communication and improves reliability of sensor node location detection. The experiment using 53 sensor nodes is conducted and the results show the presented method gives higher reliability of localization.