US 12,449,259 B2
GPS-denied geolocation
Dirk B. Warnaar, Raleigh, NC (US); and David H. Johnson, Raleigh, NC (US)
Assigned to Applied Research Associates, Inc., Albuquerque, NM (US)
Filed by Applied Research Associates, Inc., Albuquerque, NM (US)
Filed on Oct. 27, 2023, as Appl. No. 18/496,329.
Application 18/496,329 is a continuation of application No. 17/346,549, filed on Jun. 14, 2021, granted, now 11,835,340.
Application 17/346,549 is a continuation of application No. 16/413,187, filed on May 15, 2019, granted, now 11,035,674, issued on Jun. 15, 2021.
Prior Publication US 2024/0060779 A1, Feb. 22, 2024
Int. Cl. G01C 21/00 (2006.01); G01C 3/00 (2006.01); G01C 9/00 (2006.01); G01C 15/00 (2006.01)
CPC G01C 21/005 (2013.01) [G01C 3/00 (2013.01); G01C 9/00 (2013.01); G01C 15/002 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for preparing a condensed dataset for determining a geolocation in a GPS-denied environment, comprising:
at least one processor, and
one or more non-transitory computer-readable media storing computer-executable instructions that, when executed by the at least one processor, perform a method of generating the condensed dataset for determining the geolocation in the GPS-denied environment, the method comprising:
obtaining elevation data indicative of elevations of at least terrain in an area of interest,
wherein the area of interest is in the GPS-denied environment;
generating a gridded height map of the area of interest from the elevation data;
computing visible horizon data for each grid point of the gridded height map; and
configuring the visible horizon data for storing on a geospatial datastore on a mobile device.