METHOD OF DETERMINING POSITION AND MOTION PARAMETRES OF OBJECT FLYING OVER SEA SURFACE AT SUPERSONIC SPEED AND AT LOW ALTITUDE FROM WIDTH OF TRACE ON SEA SURFACE

摘要

FIELD: physics.;SUBSTANCE: method of determining position and motion parametres of a supersonic object flying at low altitude over the surface of the sea (SS) from the radar-detected trace of the object on the sea surface does not require radar reflection from the object itself. The method is implemented by detecting the sea surface disturbance, the speed of the front of which enables its classification as a trace of an object flying at low altitude over the sea surface. Detection is carried out using a self-contained radar set mounted on a ship within the radar horizon using multiposition radar detection. The speed of the object is determined from the speed of the front of the sea surface disturbance and the direction of movement of the object is determined from the direction of movement of the front of the sea surface disturbance (SSD). Before detection of the sea surface disturbance, the average slope of large sea surface waves is determined. The average slope of large sea surface waves is determined using the ratio of intensity of electromagnetic energy back-scattering at two angles of slide which are not greater than the average slope of the wavy surface. In order to determine the position and motion parametres of the object, the width of the sea surface disturbance (trace) is measured at a distance from the front of the sea surface disturbance which is greater than L on the entire length of the trace. The width of the trace is measured through radar range strobing. The width of the trace, the distance from the front of the sea surface disturbance to the point where the width of the trace is constant, the flight altitude of the object, the projection on the sea surface of the distance front of the sea surface disturbance to the position of the object is determined using corresponding relationships.;EFFECT: detection and tracking of stealth objects flying near the sea surface which leave air disturbances behind.;1 dwg