Available Technology

Lidar detection using shadow enhancement

A method is presented for detecting a body at sea. A lidar system provided onboard an aircraft transmits radiation at a wavelength in the blue/green region of the energy spectrum towards the surface of the sea. The lidar system is tuned to receive return reflections occurring over a specified wavelength range. A shaped area located near the body is designed to inhibit any return reflections that would be detectable by the lidar system. The shaped area defines a shape that is abnormal for the area of the sea being searched and defines a size that is larger than the body. The presence of the body is indicated by a null return corresponding to the shape and size of the shaped area.
Inventors: 

Brett W. Cordes, Jack M. Lloyd, Jr.

Patent Number: 
US5989087
Patent Issue Date: 
December 23, 1999
Lab Representatives
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