Phase reference navigation system and method
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United States of America Patent
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Sep 3, 1991
Grant Date -
N/A
app pub date -
Sep 15, 1988
filing date -
Sep 15, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A phase reference navigation system and method employs a plurality of fixed narrow beamwidth antennas arranged to cover a predetermined angular sector and such that the patterns of adjacent antennas crossover one another at their half-power points. Each antenna radiates an RF carrier which is amplitude modulated by a reference phase signal and by one of two different frequency subcarriers. Adjacent antennas radiate different frequency subcarriers. Each subcarrier is frequency modulated by a variable phase signal which has a phase relative to the reference signal which corresponds to the direction of orientation of the antenna from which that subcarrier radiates. A receiver simultaneously receives the RF energy radiated by two adjacent antennas. Upon demodulation, the two variable phase signals are recovered and combined to produce a resultant signal which has a phase that varies as a function of angle between the two antennas. The invention utilizes FM capture effect principles to substantially reduce multipath effects and is useful for omni-directional, or bi-directional or uni-directional systems.
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