本文介紹了一種利用GPS 技術研制的公路測速系統速度標準裝置，通過GPS 接收處
理模塊，采用多普勒頻移變換速率的測量方式，可直接輸出與速度成比例的數字脈沖頻率信號，經濾波、放大、整形后，送入單片機運算處理，以實現對機動車速度和里程的測量。本標準裝置適用于各種具有超速拍照功能的機動車超速自動監測系統的檢定與校準。
關鍵詞：GPS；單片機；機動車超速自動監測系統；測速

Research on standard equipment of speed based on GPS technology ZHAO Jun，LIU Mei Sheng, YANG Chun-Sheng，JIANG Dong， (National Institute of Measurement and Testing Technology，ChengDu 610021) Abstract：A standard equipment of highway speed measurement system using GPS technology introduced in this paper. Through the GPS receiver module, using Doppler frequency shift transform the rate measurement method, Digital pulse-frequency signals proportion to the number of vehicle speed can be output directly. By filtering, amplifing and adjusting,then into the microcontroller processing, to achieve the vehicle speed and mileage measurement. The standard equipment applied to test and calibration of all kinds of automatic devices with overspeed and camera monitoring functions.
Key words：GPS；single chip microcomputer；vehicle overspeed auto-monitoring system；
speed measurement