Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1988-09-15
1991-09-03
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342432, G01S 114, G01S 504
Patent
active
050458590
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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Aviation Systems Concepts, Inc.
Issing Gregory C.
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