Communications: radio wave antennas – Antennas – With vehicle
Patent
1992-11-30
1995-03-14
Hajec, Donald
Communications: radio wave antennas
Antennas
With vehicle
343786, 343840, H01Q 1912
Patent
active
053980352
ABSTRACT:
A miniature dual-band two-way mobile satellite-tracking antenna system mounted on a movable vehicle includes a miniature parabolic reflector dish having an elliptical aperture with major and minor elliptical axes aligned horizontally and vertically, respectively, to maximize azimuthal directionality and minimize elevational directionality to an extent corresponding to expected pitch excursions of the movable ground vehicle. A feed-horn has a back end and an open front end facing the reflector dish and has vertical side walls opening out from the back end to the front end at a lesser horn angle and horizontal top and bottom walls opening out from the back end to the front end at a greater horn angle. An RF circuit couples two different signal bands between the feed-horn and the user. An antenna attitude controller maintains an antenna azimuth direction relative to the satellite by rotating it in azimuth in response to sensed yaw motions of the movable ground vehicle so as to compensate for the yaw motions to within a pointing error angle. The controller sinusoidally dithers the antenna through a small azimuth dither angle greater than the pointing error angle while sensing a signal from the satellite received at the reflector dish, and deduces the pointing angle error from dither-induced fluctuations in the received signal.
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Densmore Arthur C.
Jamnejad Vahraz
Woo Kenneth E.
Hajec Donald
Ho Tan
Jones Thomas H.
Kusmiss John H.
Miller Guy M.
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