Bispectral passive velocimeter of a moving noisy machine
Takuso Sato, Kimio Sasaki, Mitsuhiro Taketani · The Journal of the Acoustical Society of America · 1980
A new method of determination of the velocity of a moving noisy machine by the analysis of a signal detected at a fixed point is proposed. In this system, it is assumed that the trajectory of the object is known beforehand and the special characteristics of a machine noise in the bispectral region are used so that a measuring system which does not suffer from any surrounding Gaussian noise is realized. The nonstationary change of the bispectral characteristics, along with the movement of the object, is detected from a set of short-time bispectra in segmented intervals and the method of minimum mean-square-error fitting is applied to get reliable velocity. The principle, concrete construction, and experimental results are shown. The results show the superiority of the new method over conventional methods.