敘述了基于GSM網絡的定位系統的系統框架及實現方案，分析了定位演示系統的紅外通信接口協議及協議所采用的狀態轉換原理圖；討論了定位演示系統定位算法的原理和方法，建立了定位演示系統所采用的信道模型；同時給出了在微小區環境下的測試結果。結果表明：該方案能通過無線蜂窩系統完成手機相對位置計算，并結合電子地圖很好地得到手機的絕對位置，最終完成了定位跟蹤。
關 鍵 詞 定位技術; 通信接口協議; 定位算法; 雙斜率模型

Abstract This paper introduces the architecture of GSM location system and its implementation scheme. It describes the infrared communication interface protocol of this demo system, and brings forward the status transform diagram used by the protocol. It mainly analyses the theories and methods of the location algorithm used by the demo system, and builds its channel model. Meanwhile, it analyses the testing results in the micro-cellular condition. With this it shows that this scheme accomplishes the mobile telephone relative position calculating using wireless cellular system, and will more perfectly acquire the absolute position of the mobile phone, so eventually complete the location tracing.
Key words location technology; communication interface protocol; location arithmetic; two-slope model