METHOD OF DETERMINING POSITION AND MOTION PARAMETRES OF SUPERSONIC OBJECT FLYING AT LOW ALTITUDE ABOVE WATER FROM TRACES ON WATER SURFACE Russian patent published in 2010 - IPC G01S15/06 

FIELD: physics, navigation.

SUBSTANCE: invention relates to radio location, laser location and optics, particularly to detection, determination of motion parametres and tracking a supersonic stealth object flying at low altitude over a water surface. The method of determining position and motion parametres of a supersonic stealth object flying at low altitude over a water surface from traces on the water surface observed through radio (optical) location involves determination of the position and motion parametres of the object from water surface anomalies (WSA), the travelling speed of the front of which enables its classification as a trace of an object flying at low altitude over the water surface. Contrast of the anomalies to the surrounding water surface is used to determine position and motion parametres. The speed of the object is taken to be equal to the travelling speed of the front of WSA (trace). The displacement vector of the object is taken to be equal to the displacement vector of the WSA front. The width of the WSA (trace) is measured at a certain distance from the WSA front. The distance of the front from the point of measuring the WSA width is defined as the product of the ratio of the speed of the object to the speed of sound in the surrounding airspace and the difference. The flight altitude of the object is defined as the difference. The projection on the water surface of the distance from the WSA front to the position of the object is defined as the difference. The projection on the water surface of the distance from the WSA front to the object can be calculated through the flight altitude of the object as a ratio of the product of the flight altitude of the object and the speed of the object to the speed of sound in the air space surrounding the object. The method can be realised using a self-contained radar set (laser radar, television device) onboard a vessel within the radar horizon, with an air (space) carrier, as well as using multiposition radar (laser location, optical observation).

EFFECT: detection and tracking of stealth objects flying near a water surface which leave air disturbances behind (ie sound waves).

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