METHOD FOR MEASURING NOISE EMISSION OF A SHIP Russian patent published in 2007 - IPC G01H3/00 

FIELD: hydro-acoustic measurements, in particular, methods for measuring and monitoring noisiness of submarines.

SUBSTANCE: in accordance to method, during movement of submarine at given speed V at depth H, signals are received by hydro-acoustic antenna which is towed by submarine. Controlled parameter is evaluated on basis of energy spectrum of signals. Signals are received by non-directional receivers of antenna in N points, positioned on a straight line along movement route of submarine of given length L₀ at given distance D from first point to center of submarine. Noise emission is determined by average value of measured spectrums. Length L₀, distance D of first measurement point and number of N of measurement points are selected from expressions: where S - speed of sound in environment, H_min - minimal depth of submarine during measurement, D₀ - distance from center of submarine to first measurement point, f_H - lower frequency of measurement working spectrum, f_B - upper frequency of measurement working spectrum.

EFFECT: increased trustworthiness when measuring in low frequency spectrum range.

2 cl, 5 dwg