Freeway Rear-end Collision Avoidance Warning System To Detect A Target Power Development Study

The rear-end collision warning system (RECWS) for the motorway can make the most of the existing automotive resource and improve the automotive security, and largely decrease the rear-end collision occurring and decrease the casualty and economic expenses came from the traffic accident.Based on the model of safe following distance, the recognition theory of the minatory objects is put forward and the model of potential menace is established, which afford a theoretic base in order to decrease the nuisance alarms and enhance the reliability of the system.This paper presents an integrated comparison of object- detecting techniques, the techniques that base on millimetre wave frequency modulated pulse-Doppler radar is chosen on the basis of the idiographic demand of the RECWS. The cost of the system is reduced and the structure is pre-digested. Therefore, the detection equipment can measure distance , relative velocity and azimuth at the same time. It also analyses the structure , the testing principle of the radar , the method of measuring distance , relative velocity and azimuth.This paper lucubrates the especial electromagnetic environment of automobile and it affords a theoretic base to develop the FECWS and enhance the reliability of the system. Based on the analysis, the power supply for the processing and controlling unit, the output equipment is designed. So a low-power, high-efficiency and high-frequency DC-DC switching power supply which can satisfy the demand of the FECWS is developed. As a result, the switching power supply largely improves the electromagnetic compatibility (EMC).