本論文旨在研製一套可資用於調查沿岸流況之量測及資料傳輸的系統，此套系統主要包含三個子系統：定位量測系統、資料處理系統和無線電傳輸系統。在定位量測系統中，利用全球定位系統接收器定位浮球座標，而資料處理系統採用8051單晶片當作系統處理的核心，在文中應用軟體UART的方法，用來接收全球定位系統接收器的資料和傳送資料至個人電腦，在通訊協定方面，則利用硬體UART完成兩顆浮球與基地台之間的通訊，而本文設定兩顆浮球是每秒輪流傳送資料，無線電傳輸系統為資料傳輸的管道，無線電收發器的頻帶設計在433.92MHz，以頻率移鍵的方式調變，整體傳輸功率約為800mW，接收靈敏度約為-80dBm，並於最後做電腦監控和資料收錄，經由實驗結果證實可達到定位量測及傳輸的目的。

This thesis presents a measuring and data transmission system for longshore current survey, which is mainly composed of the positioning sub-system, the data processing sub-system and the radio transmission sub-system. In the positioning sub-system, Global Positioning System (GPS) receiver is employed to locate ball position. A single-chip 8051 is used for data processing sub-system. Applying the software UART, we receive data from the GPS receiver and transmit GPS data to PC. Regarding the communication protocol, the hardware UART method is used to communicate between two balls and base station. In this thesis, the two balls are set to taking turns to transmit data per second. The radio transmission sub-system is a channel of the data transmits. The frequency band of radio transceiver is 433.92MHz, which is modulated by Frequency Shift Keying (FSK) method. The radio transceiver total output power is over 800mW. The sensitivity is over –80dBm. Finally, a PC-based information monitoring and storing sub-system is designed to collect the experimental data. The experimental results verify that the purpose of positioning and transmission is achieved.

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