Abstract
The objective of this research is to develop the multipoint displacement measurement system for infrastructures. This paper describes the developed prototype of this system and shows the results of the field experiments. This system consists of a GPS server and sensor nodes. A low cost Ll GPS receiver and a wireless LAN device are equipped on the sensor nodes. A GPS server is able to gather the GPS data received at sensor nodes and to estimate their accurate positions by analyzing the Ll carrier phases. Field experiments were conducted with three sensor nodes. The results show that the positions of the sensor nodes are monitored by the accuracy of a few centimeters. The integer ambiguities, that are needed to estimate the accurate position, are correctly determined in 10 minutes in the experiment.
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