Title:
COMMUNICATION SATELLITE CELLULAR COVERAGE POINTING CORRECTION USING UPLINK BEACON SIGNAL
Document Type and Number:
WIPO Patent Application WO2005025109
Kind Code:
A3
Abstract:
A communication satellite cellular coverage pointing correction using uplink beacon signal is provided. A ground-based beacon transmits a monopulse tracking signal or a Traveling Wave Coupler (TWC) tracking signal to a specialized tracking feed section 215 located within each uplink and downlink antennae of a satellite. From the monopulse or TWC tracking signal, a pointing correction is determined for each reflector, for example, the angle off boresight and the angle between the present beam direction and the target direction. Each reflector is then gimbaled to re-point the reflector to the target area. In this way, both uplink and downlink antennae are provided with closed- loop control over antenna pointing.
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Inventors:
WESTALL KENNETH E (US)
Application Number:
PCT/US2004/022296
Publication Date:
December 14, 2006
Filing Date:
July 29, 2004
Export Citation:
Assignee:
NORTHROP GRUMMAN CORP (US)
WESTALL KENNETH E (US)
WESTALL KENNETH E (US)
International Classes:
H01Q3/00; G01S1/08; H01Q1/12; H01Q1/28; H01Q25/00; H01Q25/02; H04B7/185; H04L
Foreign References:
US6393255B1 | 2002-05-21 | |||
US6504502B1 | 2003-01-07 |
Other References:
See also references of EP 1661280A4
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