PASSIVE METHOD OF DETECTING VEHICLES BY ITS OWN ACOUSTIC NOISE Russian patent published in 2017 - IPC G01S3/80 

FIELD: physics.

SUBSTANCE: synchronously receive a signal for two antennas, digitize and store information arrays. Split the signal into intervals, carry out identification by maxima in the amplitude spectrum. Then carry out the scanning directional characteristics of receiving antenna for each nth time interval according to the total signal from the output of each of the two receiving antennas, build fan chart, determine the availability of transport by the presence of unexpected fan charts, then determine the azimuth direction relative to the center of the antenna as a weighted average of maximum angles peaks in fan pattern diagram, the sign of the difference between the angles, decide on direction, calculate the current y coordinate using the coordinates for the neighbouring define interval speed. The second implementation, determine the direction of the movement and location of the sign of the slope dependence of delay time correlation of maximum convolution arrays and on the dynamics of its inclination, calculate the autocorrelation function of total data then sum array and determine the speed of the vehicle as the ratio of the distance between the centers of the antennae to the time between the maximums of the autocorrelation function.

EFFECT: enabling simultaneous identification, calculate the speed and direction of movement.

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