Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1984-03-29
1987-02-03
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
G01S 146
Patent
active
046411429
ABSTRACT:
A TACAN beacon is disclosed in which the pulse-modulated carrier signal generated in a transmitter is applied to the elements of a circular antenna array through controllable phase shifters that generate 15-Hz and 135-Hz sidebands through, switches, and through a Butler matrix. A switching facility generates two states. In the first state, the phase shifters are controlled to generate the upper and lower 15-Hz sidebands and the upper 135-Hz sideband, respectively. In the second state, they are controlled to form the respective opposite sidebands.
The Butler matrix generates, radio-frequency phase-rotation fields at the antenna. In the two states, the ordinal numbers of the radio-frequency phase-rotation fields differ in their signs. The absolute value of the largest ordinal number is smaller than or equal to six, and the sum of the absolute values of the ordinal numbers for the carrier signal and the upper or lower 135-Hz sideband is equal to 9.
REFERENCES:
patent: 3474447 (1968-05-01), Melancon
patent: 3587099 (1971-06-01), Kramar
patent: 3747102 (1973-07-01), Cooper
Greving Gerhard
Hofgen Gunther
Zeitz Rudiger
Blum Theodore M.
Hellner Mark
International Standard Electric Corporation
O'Halloran John T.
Seitter Robert P.
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