Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Patent
1987-07-01
1989-06-20
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
H01Q 300
Patent
active
048413038
ABSTRACT:
A low cost, automatic steering system and method of operation for mobile mounted, rotatable, directional antennas is described. The improved system and method provides a means to sense the direction of the satellite and also to determine changes in direction of the mobile vehicle on which the rotatable directional antenna is mounted, and uses those items of information to point the antenna toward the satellite and to maintain the pointing of the directional antenna as the vehicle changes speed and/or direction and during periods when the received communication signal is degraded or interrupted. The novel system and method separates the signal sampling for steering purposes from the antenna scanning for communication signal reception and replaces gyroscopes or magnetic compasses used with prior art systems to obtain directional information by deriving directional information from the action of the vehicle as determined by its steering mechanism and speedometer or equivalent devices. The system and method thus eliminates any effect on signal quality while optimizing signal sampling rate for steering purposes. It eliminates the need for costly gyroscope and avoids problems encountered with magnetically operated systems due to magnetic variation and deviation. The invention further uses the means for sensing changes in direction of the vehicle and pointing direction of the directional antenna to the satellite in such a manner that enables the system to be made self-calibrating. The design of the system is such that it is low in cost and appropriate to communication satellite mobile applications.
REFERENCES:
patent: 2700106 (1955-01-01), Taylor
patent: 3503070 (1970-03-01), Kompfner
patent: 4263539 (1981-04-01), Barton
patent: 4630056 (1986-12-01), Noguchi et al.
patent: 4725843 (1988-02-01), Suzuki et al.
Blum Theodore M.
Cain David
Helzer Charles W.
Mobile Satellite Corporation
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