定位系統目前廣泛應用於工程、醫療與個人定位等民生用途，現有使用無線通訊來定位的系統中，最常見的即為GPS全球衛星定位系統。但GPS一般而言無法應用於室內。目前適用於室內定位的方法包括訊號傳送時間(Time of arrival)、訊號傳送時間差(Time difference of arrival)、訊號接收角度(Angle of arrival)、接收訊號強度(Received signal strength)等定位方法。這其中RSS 定位系統是利用訊號的強度來建構環境的場強分佈圖，利用發射端和各接收端所收到訊號強度做比較進而定出使用者確切位置的方法，其好處在於較不受多路徑效應與室內環境的影響，並能數量化影響定位精度的環境變因。本論文之目的為針對RSS的定位法則進行分析研究，採用Zigbee無線網路的實地量測結果以驗證此法可行性，並以SOPC發展平台實現此室內定位系統。此一方法可望與既有室內／外定位方法相互結合以增進定位服務之範圍與精度。

　Location techniques are crucial in many engineering and medical applications. In existing wireless positioning systems, GPS is the most widely used system. However, GPS is not suitable in an indoor environment due to the attenuation of its signals. The methods that are suitable for indoor positioning include TOA, TDOA, AOA, and RSS. The RSS based positioning system employs the signal intensity to build the distribution map, and compares the signal intensity of transmitters with receivers to determine the location of the users. This thesis discusses the principle of using RSS for positioning and adopts the Zigbee wireless communication technique to verify the RSS based positioning concept, and uses SOPC development kits to implement this indoor positioning system. This method can be combined with others indoor and outdoor positioning techniques to improve the coverage and accuracy of the location-based service.

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