Navigation point locating method and apparatus

Details Navigation point locating method and apparatus Navigation point locating method and apparatus

G - Physics

01

C

343/82

G01C 21/00 (2006.01) G01S 5/02 (2006.01)

Patent

CA 1254977

NAVIGATION POINT LOCATING SYSTEM Abstract of the Disclosure A system for determining the closest navi- gation point to an aircraft utilizes a sphere of in- fluence principle wherein the earth is subdivided into a plurality of geographic areas (FIG. 2), for example, one quarter degree squares of latitude and longitude. An identifier such as an index number of the closest navigation point to each square is stored in a look up table. Position information from the navigation system (12) of the aircraft is used to address the look up table (16) to retrieve the appro- priate index number which is then used to address a second look up table (18) that contains information defining the closest nagivation point.

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