Monitoring steep slope movement at xiaowan dam with gps multi-antenna method

摘要

This article describes a remote-controlled GPS monitoring system using GPS multi-antenna new method and General Packet Radio Service (GPRS) wireless data communication. The system has been conducted for monitoring the steep slope movement at Xiaowan hydropower station on the Lancang River in China. A dedicated electronic switching device was developed to connect the GPS receiver with the antennas, significantly reducing the required hardware investment. The slope dynamic model and observation model have then been established to estimate the slope displacements and the rate of displacements using Kalman filter, and the results show that the system has excellent performances and produces measurement accuracy of approximately 2-3 mm in horizontal direction over a 24-hour period. The slope movements have been analyzed, which are in good agreement with the studies using conventional monitoring methods.