論文摘要： 在無線感測網路中，定位可以算是一個最重要的課題，如動物的棲息地觀察和入侵檢測系統，都必須依靠有效、及時地與準確定位技術，在至今眾多已發展的定位技術，由於Radio Signal Strength Index(RSSI)的簡單和可擴展性，所以在測量距離上RSSI一直具有一定的吸引力。 然而，在讀取RSSI值的時候容易受到各種因素干擾，如:濕度與溫度，所以我們希望尋求一個能夠降低這些因素干擾的方法，在這篇論文裡，我們試著量化傳送端電壓對RSSI的影響，我們使用線性迴歸方程式來表現出電壓與信號強度的關係。我們能夠利用傳送端的電壓變化來修改現有使用信號強度來計算距離的公式，從我們的實驗中，我們發現的我們新方法能夠在提高距離計算的平均準確度達到58%。 關鍵字：無線感測網路、定位、電壓、 信號強度Abstract Localization is one of the most important topics in wireless sensor networks. Many applications, such as animal habitant observation and intruder detection, rely on an effective, prompt, and accurate localization technique. Among many localization techniques been developed to date, the range-based ones utilizing Radio Signal Strength Index (RSSI) as basis for distance measurement are appealing due to its simplicity and extensibility. However, the reading of RSSI is affected by many factors, such as Humidity and Temperature. As a result, the accuracy of the distance computed from RSSI as well as the localization built on top of it is reduced. In this thesis, we try to examine and quantify the impact of transmitter voltage to RSSI. Using the technique of linear aggression on the collected experimental RSSI readings, we are able to revise the existing equation for distance computation from RSSI to take the transmission voltage into account. From our experiments, we have found that the new equation improves the distance estimation accuracy by 50%~98% in most case. Keywords: ad-hoc sensor network, localization, voltage, RSSI
