ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,449,259, issued on Oct. 21, was assigned to Applied Research Associates Inc. (Albuquerque, N.M.).
"GPS-denied geolocation" was invented by Dirk B. Warnaar (Raleigh, N.C.) and David H. Johnson (Raleigh, N.C.).
According to the abstract* released by the U.S. Patent & Trademark Office: "Systems and techniques for navigation in a GPS-denied environment that do not rely on locations of known points. Instead, the operator can measure distance and/or inclination as well as azimuth to arbitrary points on the visual horizon (or sub-horizon) from their location. These observations can then be compared to precomputed distances and inclinations for corresponding azimuths to the visual horizon of...