Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-03-23
1983-11-29
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343352, 343432, H04B 700
Patent
active
044183500
ABSTRACT:
An antenna pointing control system primarily useful for aiming and controlling a communications satellite directional antenna. The invention makes use of a ground based pilot station which transmits an up-link signal to the satellite, including frequency differentiated communication signals and command and control signals. The command and control signals are referred to as the beacon or pilot signal. The pilot signal is a triangular frequency modulation waveform. The communications signals and the pilot signal are received by a common directional antenna on the satellite. A microwave network coupled to a multiple feed horn assembly of the antenna and responsive to the pilot signal produces pilot signal components including a sum signal and east-west and north-south error signals indicative of the corresponding angular errors between the desired antenna pointing direction and the direction from the satellite to the pilot station. Subsequent processing of the pilot signal components in a command and control receiver yields both command information and steering signals, the latter for controlling the antenna pointing direction with respect to the pilot station.
REFERENCES:
patent: 3480960 (1969-11-01), Zulch et al.
Blum Theodore M.
Hughes Aircraft Company
Karambelas A. W.
Oberheim E. F.
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