Doppler based speed estimation of vehicles using passive sensor

This paper aims to develop a system for estimating a vehicle´s speed by analyzing its drive by acoustics with a passive audio microphone. Analysis of the vehicle´s acoustics would primarily use the phenomenon of Doppler shift, and the instant at which vehicle is at closest-point-of approach. This approach uses a technique called Seam carving to track harmonics formed by vehicle particularly its engine noise. The method proposed is computationally inexpensive and can very easily be developed into mobile application.