METHOD OF MEASURING TARGET SPEED WITH ECHO-RANGING SONAR Russian patent published in 2018 - IPC G01S15/00 

FIELD: measurement technology.

SUBSTANCE: method for measuring the speed of a target's motion by echo-ranging sonar, containing the radiation of a probing signal, echo signal receiving by a static fan of directional characteristics, detection of an echo, measuring distance, measuring the direction to the object, in which the level of isotropic interference is measured after the radiation of the probing signal, select the threshold, determine the numbers of the spatial channels N_i, in which the threshold was exceeded, the detection times of echoes are measured, determine the maximum amplitude of the detected echo signal A_i in each channel, compare the detection times of these amplitudes and, when the times coincide, determine the numbers of the spatial channels in which the coincidence occurred, and if these spatial channels are adjacent, it is determined that the received echo from one object, and the heading angle of the object is determined by the formula where Δβ° – width of the spatial channel characteristic, N_i – the number of the directivity characteristic in which the maximum amplitude of the echo is measured, Ai is the value of the maximum amplitude of the echo in channel N_i, Ai±1 – value of the maximum amplitude in adjacent spatial channels N_i±1, where an echo is detected in the same time interval, radiate the second and subsequent probing signals, determine the distance D_m, define the where M – the number of the probing signal, determine the amount of change in the course angle ΔCA = (CA₁-CA_m) and the sign of the change in the course angle, determine the tangential component of the distance D_t, traversed by the target in time MT, where M is the number of marks in the measurement, according to the formula D_t=D_m SinΔCA°, determine the tangential target speed according to the formula Vt=D_t\MT, determine the radial target speed by the formula Vr=Vt tgΔCA°, and the total velocity is determined by the formula

EFFECT: method for measuring the movement speed of a target with a sonar is proposed.

1 cl, 1 dwg