Abstract
Deformation monitoring for dam is quite important and it can be directly used to reflect the running status to keep the operation safely. In order to meet the demand for monitoring the dam, global position system (GPS) is used to develop a monitoring system with high efficiency. In this paper, we developed a monitoring system for deformation monitoring for the dam with wireless data transmission. In order to reduce the energy consumption, the regulation of its working condition has been redesigned according to the monitoring object's own characteristics. At the same time, the data compression is also used in the GPS data processing to reduce the energy consumption. The compression method is divided into two steps. In the preprocessing, data amount can be removed about half of the amount, and Hoffman coding compression rate and the style conversion compression ratio are relatively small. The total compression rate is more than 60%. Compared with the existing compression algorithms, the new developed method has higher compression rate. When the data collection rate is higher, the compression will be higher, and the reason may be that the time information and position information are compressed when the data collection rate is higher. This method can be used to process the data effectively and improve the data transmitting efficiency.
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