該系統采用GPS 技術和GSM 網絡。當老人或孩子遇到麻煩時，他（她）可選擇自動或手動方式發出求救信號，系統將立刻啟動GSM 呼叫系統與信息中心或親友建立連接，并采用主動和被動兩種方式，將經度、緯度、聲音、溫濕度等安全狀態信息實時傳送到信息中心或者設定的親友手機上，并在導航地圖上顯示出他（她）當前所在的位置。該設計中采用了“黑匣子”功能，完成了啟動報警時最近20s 的音頻信息和位置信息的實時存儲。
關鍵詞：無線通信；單片機；報警系統
Abstract: A design of personal anti-hijack alarming system with GPS technique and GSM network is presented. When the old man and kid meet bother, he(she) can choose auto or hand to move a way to send out to plea for help signal. This system would send SOS signal automatically or manually, activating GSM calling system and connecting with information center or relatives，sending current latitude and longitude，sounds，temperature and humidity to information center or relative phones by the way of Active and passive, and display the position him(her)current place in navigating map. “Black-Box” was successfully used, completing the last 20s Audio Information and hostages position information real-time stored.
Key words: wireless communication; single-chip computer; alarming system