Kenneth A Summers

US Patent:

6510401, Jan 21, 2003

Filed:

May 11, 2001

Appl. No.:

09/854194

Inventors:

Kenneth I. Martin - Columbia MD
Kenneth E. Summers - Pasadena MD

Assignee:

The United States of America as represented by the Director of the National Security Agency - Washington DC

International Classification:

H04B 1000

US Classification:

702150, 359154, 356614, 342417

Abstract:

A beacon modulated by a pattern is authenticated by recording an array of light intensities for each point in a field of view; digitizing the array of light intensities; modifying a first array according to the digitized light-intensities and the modulation pattern; repeating these steps for additional frames at the current viewpoint; if the beacon is found then repeating these steps for additional frames; if the beacon is found and additional frames were processed then authenticating the beacon at the point in the current viewpoint corresponding to the value in the first array that exceeds a first threshold by the widest margin; if the beacon was not found, moving to a new point in the field of view and repeating the steps above; if the beacon is again not found, adjusting the modulation bit pattern x bits, and reprocessing the viewpoints in the field of view using the steps above.