METHOD OF DETERMINING TORPEDO MOTION PARAMETERS Russian patent published in 2015 - IPC G01S15/87 

FIELD: physics.

SUBSTANCE: method is based on consecutive detection of a torpedo in noise direction-finding, hydroacoustic signal detection and active sonar modes, and determining motion parameters thereof in a minimal number of location cycles and on a long distance. The method comprises, in noise direction-finding and hydroacoustic signal detection modes, receiving noise emission signals of a target and sounding signals of the homing system thereof and performing classification in a secondary information processing unit and, if the frequency of the sounding signal relates to the frequency band of the homing system of the torpedo, the values of the heading angles P_i are varied at the stern of the ship, and the level of the received signals rises, the target is classified as a torpedo, and when the level of the forward SSN signal of the torpedo exceeds a threshold value, the torpedo is considered to have switched to a homing trajectory, at that moment, the method includes beginning the determination of the distance to the target based on the set of heading angles P_i, using the value of own velocity V_n and the probable velocity of the torpedo V_t, calculating the initial distance D₁ and current distance D_i to the torpedo, around the calculated distances generating a gate S_t, the size of which is defined by errors in determining distance in noise direction-finding mode and errors in determining the heading angle, then according to the continuously obtained estimate of the distance D_i and the size of the gate S_t from the noise direction-finding mode, calculating the probability of detecting the torpedo W_t in GL OBO sonar mode in the gate S_t and, when the value of the current probability of detection exceeds a given value W_t≥W_giv, selecting the scanning scale of the range indicator, where the echo signal mark will be observed within the selected scale, and from the heading angle, emitting a sounding signal to the torpedo, receiving the reflected echo signal within the gate S_t and outputting data on coordinates of the torpedo to the ship system for neutralisation thereof.

EFFECT: longer range for determining torpedo motion parameters.

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