ALEXANDRIA, Va., Dec. 23 -- United States Patent no. 12,504,545, issued on Dec. 23.
"Position location for navigation without GPS" was invented by Song Howard An (San Diego).
According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus and method of determining the position location of a moving platform without using any GPS signals such as in the GPS-denial environment is disclosed. A direction finding system is employed to receive signals from a source of known position location and to compute the look angles. The look angles include the azimuth and the elevation information. The position location (e.g., latitude and longitude) of the moving platform is determined from the computed azimuth and elevation and t...