Research of Automobile Speed Measuring System Based on Linear CCD

One automobile speed measuring system based on linear CCD is designed. The linear CCD is the front detecting device, and the MCU processed the CCD output signal using the edge identification arithmetic to achieve automobile accurate localizing on one moment. In this way, the automobile speed can be measured accurately on slope. In this article, the architecture and principle of CCD have been elaborated in detail, one timing sequence driving design method of linear CCD based on the CPLD chip of EPM7128 is described, while the principle and composition of the speed measuring system are introduced as well. Through experiments, the speed measuring range of the system is 5 m/h~160 km/h and the error is less than 0.5 km/h. Right now this system has already been successfully used as an examine system for drivers driving with a ramp. It has been proved that it is accurate with sensitive responsiveness.