Lidar Detection Using Shadow Enhancement
Patent, Filed 18 Mar 1998, patented 23 Nov 1999
DEPARTMENT OF THE NAVY WASHINGTON DC
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A method is presented for detecting a body at sea. A lidar system provided onboard an aircraft transmits radiation at a wavelength in the bluegreen region of the energy spectrum towards the surface of the sea. The lidar system is tuned to receive return reflections occurring over a specified wave-length 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.
- Optical Detection and Detectors