Broadband analysis of a microphone array based road traffic speed estimator

Recently, a maximum likelihood estimate has been proposed for road vehicle speed based on two omnidirectional microphones. We undertake a broadband analysis in a stochastic setting in order to expose the effect of input SNR, target speed, bandwidth, and observation time in the SNR at the output of the modified crosscorrelator on which the estimate is based. The use of 1-bit quantized signals, which provides an important hardware simplification, is also considered and seen to result in mild performance degradation.