METHOD OF DETERMINING DIRECTION OF HYDROACOUSTIC TRANSPONDER BEACON ON HORIZONTAL AND VERTICAL ANGLE Russian patent published in 2013 - IPC G01S3/802 

FIELD: physics.

SUBSTANCE: method involves a ship emitting a request signal and a spatial antenna array receiving a response signal from a transponder beacon; the spatial antenna array is broken into a set of planes such that each plane is formed by acoustic centres of three or four converters lying on two intercrossing lines; each plane is linked to its own Cartesian coordinate system and the horizontal angle and vertical angle of the direction of the signal source is calculated, for which converters whose acoustic centres form said plane are broken into two pairs; the signal is digitised with sampling frequency F_s; a cross-correlation function of signals x₁ and x₂ is calculated and for each pair of converters, the difference in time of arrival of the plane wave front at the converters is calculated. For each plane, the horizontal A' and vertical E' angle of the direction of the signal source is calculated in the coordinate system O'X'Y'Z' of the corresponding plane.

EFFECT: fewer computation operations for determining direction of a hydroacoustic transponder beacon, fewer converters in antenna arrays when using as the response signal of the transponder beacon a phase-shift keyed or linear frequency-modulated composite navigation signal.

5 dwg