Distributed Real-Time High-Precision Localization Algorithm for Wireless Sensor Network

• Main Authors: Ying Tsao, 曹穎
• Other Authors: Wen Ouyang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/11657213730791456477

碩士 === 中華大學 === 資訊工程學系(所) === 99 === Besides sensing the environment variables, the application of localization in wireless sensor networks has became an important research subject. Unlike the other range-free localization schemes which are not effective in real time performance, we propose a real time algorithm, which determines the location of the moving object based on dynamically changing signal strength. Our proposal improves the precision of the localization by frequently observing the changing signal strength. Under this scheme, we introduce some anchors that have the knowledge of their own position. These anchors observe the signal strength of moving objects frequently. Based on the changing signal strength, an anchor determines if the object is closing in or moving away from it. Together with information such as the rate of moving and the sampling frequency, we can forecast the moving object's new position. This is how real-time localization can be achieved with precision. The simulation results demonstrated our algorithm is more effective and precise in the sense of real time localization scheme compared with previous method.