Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1998-10-30
2000-12-26
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
34235706, 342417, 701213, H04B 7185
Patent
active
061666866
ABSTRACT:
A directional finding system for providing a corrected compass bearing based upon true north rather than magnetic north for a selected location. The true bearing is calculated by determining a present position with a GPS receiver or other location finding device, then selecting the deviation between true north and magnetic north for the present position from a store of magnetic deviation data, and finally correcting the magnetic bearing by the deviation to find a true bearing. The store of magnetic deviation data comprises the deviation between true north and magnetic north for any location. Additionally, the true bearing can be further corrected by a time-based magnetic deviation based upon the monotonic movement of the magnetic north pole. The true bearing is presented on a display along with the magnetic bearing and the present position.
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Anderson Terry J.
Hoch Jr. Karl J.
Northrop Grumman Corporation
Pham Dao L.
Tarcza Thomas H.
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