Method of and apparatus for true north azimuth determination using the combination of crossed loop antenna and radio positioning system technologies
AssigneeMegapulse, Inc.
InventorErik Johannessen
Life of this patent
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Abstract
A method and radio navigation system compass apparatus for determining true north or azimuth or orientation of a vehicle or the like by the use of integrated Loran and satellite radio navigation receivers employing crossed-loop H-field antennas for the Loran reception, or the use of at least three Loran type transmitter, or two Loran type transmitter and a synchronized clock for determining both position and azimuth.
Claims17
A method of azimuth determination by a pair of orthogonally crossed individual loop antennas for receiving radio-frequency navigation signals from navigation transmitter sources, that comprises, acquiring the signals in the individual loop antennas of the pair of loop antenna along respective separate channels;
- comparing the acquired channel signals using their relative received field strengths to determine the relative bearing angles to the transmitter sources, and using said relative bearing angles together with the known positions of both the antennas and of the radio-frequency source to determine the orientation of the loop antennas with respect to a geographic orientation.
Radio-frequency apparatus for azimuth determination having, in combination, a Loran-C or eLoran navigation receiver employing a crossed loop antenna with a microprocessor to determine position, to identify the received stations, and to determine relative heading of the antenna so as to provide an indication of azimuth.
Radio-frequency apparatus for azimuth determination having, in combination, an integrated radio navigation receiver capable of receiving and processing radio-frequency signals from both Loran-C or eLoran navigation signals and from satellite navigation signals and employing a crossed loop antenna for the Loran signals together with a microprocessor to determine position, to identify the received signals, and to determine relative heading of the antenna so as to provide an indication of azimuth.
Dependencies are inferred from the claim text.