Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Patent
1990-09-27
1993-04-13
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
318649, 244 316, 89 4109, H01Q 300
Patent
active
052026957
ABSTRACT:
The line of sight of an airborne radar antenna is stabilized from the pitch and roll motions of the aircraft by mounting the antenna on a three degree of freedom gimbal system. The gimbal system is comprised of a first gimbal mounted for rotation about the aircraft Z axis (azimuth) for pointing the antenna along the intended line of sight, a second gimbal mounted on the first gimbal for rotating up and down with respect to the azimuth gimbal and a third gimbal mounted on the second gimbal to which the antenna is connected for providing rotation to align antenna polarization relative to inertial ground. A two degree of freedom stabilization gyro provides stabilizing signals representative of aircraft pitch and roll motions with respect to inertial reference axes. The stabilization signals, together with a line of sight pointing signal, are applied to coordinate transformation equations to generate drive signals for the respective gimbals so as to maintain the antenna pointing in the intended direction with correct polarization.
REFERENCES:
patent: 3401599 (1968-09-01), Schonherr et al.
patent: 4179696 (1979-12-01), Quesinberry et al.
patent: 4393597 (1983-07-01), Picard et al.
patent: 4621266 (1986-11-01), Le Gall et al.
Cantrell Clifford
Hollandsworth Paul E.
Blum Theodore M.
Cooper Albert B.
Levine Seymour
Sperry Marine Inc.
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