MODE OF MEASURING DISTANCE TO A CONTROLLED OBJECT Russian patent published in 2007 - IPC G01S15/08 

FIELD: the invention refers to underwater acoustics and may be used at development of acoustic distance measuring systems with increased accuracy and a range of action designed for working in reservoirs with insignificant depth( of the type of shallow seas) with large dispersion distortions of an acoustic signal.

SUBSTANCE: according to the mode a periodic impulse acoustic signal is generated and emitted on the controlling object. The emission of the acoustic signal is synchronized with the beginning of accounting of time in a receiving point on the controlled object. On the controlled object the acoustic signal is received with two receivers. One of the receivers is located directly on the bottom and in its quality they use a vector receiver of oscillating speed on whose output vertical and horizontal components of the oscillating speed are measured. In quality of the second receiver they use a directed receiver of sound pressure. According to the measured parameters taking into consideration the preliminary measured density and the sound speed in the bottom layer of water and also the density and the speed of the longitudinal waves in the ground one can define the distance to the object.

EFFECT: decreases distortions of measuring.