关键词: 无线传感器网络（WSN）, 水质监测, 数据融合, 自适应加权理论, 模糊综合评价理论

Abstract: Multi-sensor data fusion is a kind of data processing method. It refers to fusing data from a large number of sensors for various and multi-level treatment, creating a sort of information more meaningfully, while this sort of information is almost impossible to get for any single sensor. Researching of WSN-based data fusion in water quality, it puts forward a multi-sensor data fusion model of two levels, suitable for water quality monitoring, which combines self-adaptive weighted theory and fuzzy comprehensive evaluation theory together. Processing the same type of data collected from monitored area, it uses the self-adaptive weighted theory, while it uses the fuzzy comprehensive evaluation theory for different types of data. The experimental result, made by lake water sample to Chaohu Basin, shows that using the model can effectively reduce the amount of data traffic, reduce the rate of deviation, improve the credibility of monitoring result.

Key words: Wireless Sensor Network（WSN）, water quality monitoring, data fusion, self-adaptive weighted theory, fuzzy comprehensive evaluation theory