近年來世界各地自然災害頻傳，如地震、颱風、豪大雨及土石流等，在災害發生後往往會帶來大區域的損害，如建築物倒塌災民受困等狀況。而救難人員通常在不確定災民位置狀況下進入廣大的災區救援，且面臨到需在黃金72小時內找到受困災民的挑戰，針對以上問題，本論文利用手機應用程式使受困者手機發出Wi-Fi訊號，並建構可依導航點飛行之四軸飛行器及可偵測Wi-Fi訊號的無線訊號偵測模組，利用四軸飛行器搭載無線訊號偵測模組在災區空中搜尋受困者手機發出之Wi-Fi訊號，藉此偵測受困者。使用四軸飛行器自動偵測受困者方法可降低災區搜尋人力的支出及增加救援效率。

Nature disasters becomes more frequent and more serious, and they usually lead to great damage on buildings and human beings. The most common condition is that people are trapped because of collapsed buildings. The difficulty for saving victims is to search trapped victims in wide area within so-called golden 72 hours. To deal with above difficulty, the paper proposed a system which utilizes app to make victim’s cellphone send Wi-Fi signal and construct a quadcopter equipped with wireless signal detection module to search victims. With the system, we can increase saving efficiency and reduce the cost of human resources on searching victims.

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