Abstract
It is one of key issues of civil engineering to monitor the health of urban infrastructures. Therefore, a variety of issues of network sensing have been extensively studied by many researchers. One subject among those in the civil engineering field is the exact positioning of the sensor units. The objective of this research is to develop a high accurate positioning system that isemploying low-priced car navigation GPS (Global Positioning System) receiver. In this research, first, a prototype algorithm to estimate a relative position of GPS receivers is developed. And the performance of the developed algorithm is evaluated by analyzing L1 carrier phase observed at known fixed points of the Geographical Survey Institute. The accuracy of monitoring the relative position of the receivers is less than several centimeters. Next, a car navigation GPS receiver, that is remodeled to output L1 carrier phase, is tested. The accuracy of estimating a relative position of the receivers is less than several centimeters if integer ambiguities are correctly determined. The accuracy is considered to be enough high to detect a position of each sensor of network sensing or to monitor a deformation of shape of sensors network.
