Speed Detection of Moving Vehicles Using Doppler Effect

| SPEED DETECTION USING DOPPLER EFFECT AND RADAR | | | INTRODUCTION Although there is good road safety performance the number of people killed and injured on our roads remain unacceptably high. So the roads safety strategy was published or introduced to support the new casualty reduction targets. The road safety strategy includes all forms of invention based on the engineering, education and enforcement and recognizes that there are many different factors that lead to traffic collisions and casualties. The main reason is speed of vehicle. We use traffic lights and other traffic manager to reduce the speed. One among them is speed cameras. Speed cameras on the side of urban and rural roads, usually placed to catch†¦show more content†¦Doppler Effect: the principle of this effect is well known in the study of sound. It is known that if the source of sound, emitting a note of frequency v is move with a constant velocity V relative to an observers, it is found that the observer ‘p’ perceives a sound having the frequency v which differs from v, being greater or smaller according to the source is move towards or away from observers. This phenomenon in sound was first explained by Doppler and hence the name Doppler effect. But Fizeau showed that the same effect on light. Thus if the source of light is moving with a wavelength observed in the Spectroscope slightly different from the original wavelength. The principle of speed camera that is the Dopplers effect can be described by the formula fM = 2vfEcos(ÃŽ ±/c) Where fM if the frequency of the received signal v is the speed of vehicles fE if the frequency of transmitted signal ÃŽ ± is the angle between the transmitted signal and path along which the vehicle travels c is propagation speed of the signal in the air. Figure 1. The Doppler Effect From this we can deduce that sending a fixed frequency signal towards the car and then measuring the efficiency of the returning signal the can the deduce the speed of the car.The principal used for Radar in speed camera, although they have little in commonShow MoreRelatedRadar Of Radio Detection And Multiple Classification And Sub Systems Used For Processing1699 Words   |  7 Pages II. RADAR Radio Detection and Ranging (RADAR) is a sensor used in the automotive domain to derive speed and distance information. Now we will discuss on the principle of working, its classification and sub-systems used for processing. Currently we used frequency modulated continuous wave (FMCW) RADARs and so this type will be elaborated here. A. 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