System for maintaining polarization and signal-to-noise levels i

Details System for maintaining polarization and signal-to-noise levels i System for maintaining polarization and signal-to-noise levels i

1989-03-17

1991-06-25

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including polarized signal communication transmitter or...

H01Q 2106, H01Q 2124

Patent

active

050271245

ABSTRACT:
In a preferred embodiment, the disclosed system is part of a communication system (10) formed by a satellite (12) and aircraft (14). The system includes a controllable antenna network (16) and polarization tracking network (18). The controllable antenna network includes an array (28) of orthogonal antenna pairs (34) whose beams are steerable by phase shifters (46) to correct for changes in the aircraft's attitude. Similarly, amplifier circuits (44) compensate for changes that would otherwise occur in the signal-to-noise ratio of the antenna's output. The polarization tracking network includes a forward section (62), defined by quadrature hybrids (66) and (70) and an adjustable phase shifter (68), and a feedback section (64) that monitors each polarity for the presence of a single select channel. The phase shifter responds to the comparison made by a phase detector (86) in the feedback section to maintain the desired polarization of all channels.

REFERENCES:
patent: 3883872 (1975-05-01), Fletcher et al.
patent: 3921169 (1975-11-01), Lazarchik et al.
patent: 4087818 (1978-05-01), Kreutel, Jr.
patent: 4268829 (1981-05-01), Baurle et al.
patent: 4315262 (1982-02-01), Acampora et al.
patent: 4492962 (1985-01-01), Hansen
patent: 4532518 (1985-07-01), Gaglione et al.

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