METHOD FOR DETERMINING THE SPEED OF SOUND Russian patent published in 2022 - IPC G01S15/00 

FIELD: hydroacoustics.

SUBSTANCE: area of application: the present invention relates to the field of hydroacoustics and is intended for determining the speed of sound in the path of propagation of hydroacoustic signals, which is necessary for the operation of underwater illumination sonar apparatus and for research and measuring works using sonar equipment. Substance: method for determining the speed of sound includes emitting a probing signal at a frequency F_emit; receiving an echo signal by a sonar antenna with a static fan of pattern characteristics; measuring the angle Q between the direction of movement of the sonar carrier and the direction to the target Q = (K₁°-D°), wherein K₁° is the course of the sonar carrier, D° is the direction to the target; measuring the own speed of movement of the sonar carrier V_car; measuring the frequency of the received echo signal from the detected target F_rec1; finding the difference of frequencies ΔF₁=F_emit-F_rec1; measuring the angle Q₁ of the detected target between the direction of movement of the sonar carrier and the direction to the target at the first emission; changing the direction of own movement of the sonar carrier; emitting a second probing signal in the new direction of movement of the sonar carrier; measuring the frequency of the received echo signal F_rec2 and measuring the new angle of the target Q₂ between the direction of movement of the sonar carrier and the direction to the target at the second probing signal; determining the difference of frequencies of the received echo signals ΔF₂=F_emit-F_rec2, and determining the speed of sound by the formula .

EFFECT: possibility of measuring the speed of sound in the path of the probing signal in the process of detecting a target by a hydroacoustic signal without using a stationary reflector.

1 cl, 1 dwg