Ground surveillance system

Details Ground surveillance system Ground surveillance system

2003-04-07

2004-09-14

Buczinski, Stephen C. (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C340S545300, C348S140000, C348S143000, C348S144000, C356S141500

Reexamination Certificate

active

06791673

ABSTRACT:

BACKGROUND OF INVENTION
This invention relates generally to surveillance systems which are used to monitor activity in buildings and surrounding areas subject to security concerns from a point above the ground. More specifically, the invention relates to surveillance systems that not only detect activity but also identify the specific locations where the activity occurs.
BRIEF SUMMARY OF THE INVENTION
The invention is a method and system-for exercising surveillance over a surface from an observation point above the surface utilizing three-dimensional map data pertaining to the surface. The method comprises the steps of (1) intercepting the light rays from a surface in a field of view, (2) separating the intercepted light rays into a plurality of light-ray clusters where a light-ray cluster comprises a plurality of light-ray bundles, a light-ray bundle consists of the light rays from a point on the surface in the field of view, and a light-ray cluster consists of the light-ray bundles from a region of contiguous points on the surface, (3) determining the map coordinates of each region from which a light-ray cluster comes, (4) obtaining a measure or normalized measure of the radiant power of each light-ray cluster or part thereof, spectrally modified or not, at predetermined time intervals, and (5) identifying the map coordinates of a surface activity from measures or normalized measures of the radiant power of the light-ray clusters or parts thereof, spectrally modified or not.
The system for exercising surveillance over a surface from an observation point above the surface utilizing three-dimensional map data pertaining to the surface comprises a lens system for intercepting the light rays from a surface in the field of view and separating the intercepted light rays into a plurality of light-ray clusters, a detector assembly attached to the lens system and comprising a plurality of detector cells, and a processor system comprising one or more processors for reading out the measures or normalized measures of radiant power of the light-ray clusters or parts thereof, spectrally modified or not, from the detector assembly and determining the map coordinates of each region from which a light-ray cluster comes.


REFERENCES:
patent: 5196900 (1993-03-01), Pettersen
patent: 5604534 (1997-02-01), Hedges et al.
patent: 6091905 (2000-07-01), Yahav et al.

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