METHOD OF DETERMINING SPEED OF SUPERSONIC LOW-ALTITUDE OBJECT FROM TRACE ON SEA SURFACE WHEN APPROACHING OBJECT Russian patent published in 2011 - IPC G01S13/58 

FIELD: physics.

SUBSTANCE: method can be realised by a stand-alone radar set mounted on a ship when there is completely no radar reflection from the object but only a trace - anomaly on the sea surface. Before detecting the trace, the average inclination of large waves on the sea surface the propagation speed of surface (wind) waves on the sea surface (V_sw) and the propagation speed of sound waves over the sea surface (ν_s) are determined. After detecting the trace using a radar technique, the range to the front of the trace D_fr and the bearing to the front of the trace P_fr are determined. The width of the trace V_meas is the measured using a range radar strobing method. The course of the object C_ob is determined by the spatial orientation of the trace. The course angle from the front of the trace to the radar set β_fr is calculated from C_ob and P_fr. The angle of approach of the radar set and the object α is calculated from C_ob and the course of the carrier of the radar set C_r. The speed of the object is calculated from the electromagnetic wavelength λ of the radar set and the angle of slide when irradiating the sea surface through intermediate values.

EFFECT: broader functionalities.

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