Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1977-11-30
1979-04-10
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343105R, G01S 302
Patent
active
041491688
ABSTRACT:
A carrier signal of a first frequency is mixed with a tone signal of a second frequency to produce an upper sideband signal at a frequency equal to the sum of the first and second frequencies and to produce a lower sideband signal at a frequency equal to the difference of the upper and lower frequencies. The upper and lower sideband signals are provided separately and sequentially to produce a sequentially balanced modulation tone ranging signal for transmission. The received sequentially balanced modulation tone ranging signal is processed to produce a measurement signal containing the phase information of the received signal at a measurement frequency. A local signal is provided at the measurement frequency. The phase of the measurement signal is subtracted from the phase of the local signal to produce a phase shift information signal for sequentially indicating the phase shift in the upper and lower sidebands of the received signal. When it is desired to transmit data in addition to the ranging tone, the carrier signal and/or the tone signal is modulated by a data signal prior to mixing the carrier signal with the tone signal.
REFERENCES:
patent: 3340533 (1967-09-01), Earp
patent: 3928852 (1975-12-01), Barker
Rupp, Jr., "Experimental Omega Four Freq. Format Extends Lane Ambiguity", Nov. 1974, pp. 21-29, Proceedings of the 2nd Omega Symp., The Institute of Nav., Wash., D.C.
Nard, "State of Experimentation & Program of Dev. of Differential Omega in France", Nov. 1974, pp. 96-107h, Proceedings of the 2nd Omega Symp., The Institute of Nav., Wash., D.C.
Blum Theodore M.
Cubic Corporation
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