Patent ID: 6380871
Filing Date: 2002-04-30
Classification: G01S,H04B

Abstract:
A system for searching for targets in a marine environment, comprising:a) an abovewater-mounted transmitter means for emitting and directing, at a first zone of water, a first beam of optical radiation having a first wavelength characteristic enabling the first beam to refract through the first zone as a refracted beam, and for emitting and directing, at a second zone of water different in location than, and spaced apart from, the first zone, a second beam of optical radiation having a second wavelength characteristic different from the first wavelength characteristic and enabling the second beam to reflect from the second zone as a reflected beam; b) a processor for identifying locations of the targets in the marine environment, including a receiver means for separately detecting return target reflections reflected off any targets impinged by the refracted and the reflected beams to find an identified target; and c) an indicator responsive to the processor, for indicating the identified target.