Research Of Linear CCD-Based Monitoring System On Speedways

The speedway in our country has been growing rapidly in recent years, and hasformed a complicated network, which has greatly promoted the development ofeconomy. Carrying out scientific and effective administration to the speedway isbecoming a more and more important problem. Traffic data such as vehicle speed andtraffic flow is the most important data source in the administration of speedway.A new design of traffic monitoring system, which calculates the vehicle speedand takes count of the traffic flow, is put forward in this paper. The monitoring systemis equipped with linear CCD image sensor and ARM micro controller. CCD detectsthe speedway and outputs effective signal, which is processed later in ARM. In orderto guarantee the system's real-time performance, the embedded real-time operatingsystem uC/OS-Ⅱhas been used, which has also supplied a great convenience in theprocess of softeware development. As important traffic information, the monitoringresult is stored in a U disk and supplied to the relating traffic department, so it canalso be analysed and stored on PC.Compared with the traditional vehicle-detected equipment, linear CCD is not tooexpensive, and has a high speed of response. Besides, it is less affected by theenvironment around. Therefore, speed measurement system based on linear CCDgenerally has a higher reliability and precision. The use of ARM and RTOS alsocontributes to the system's reliability and advancement. The CPLD technology is alsoadopted in this system. Most digital circuits are integrated in one CPLD chip, whichcreats conditions for the system's miniaturization,stability,anti-jamming andin-system modification. The experiment demonstrates the feasibility of the design putforward in this paper.