Communications: directive radio wave systems and devices (e.g. – Directive – Including antenna orientation
Patent
1995-07-18
1996-07-16
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including antenna orientation
H01Q 300
Patent
active
055371221
ABSTRACT:
An array antenna system is provided with a function for tracking a target. The system captures the target by first carrying out search control immediately after a power supply is turned on. After capturing the target, the system performs tracking control using a beam switch controller about an azimuth. An output of a rate sensor is filtered by a high-pass filter and then reflected on a tracking signal for the tracking control. It is possible to keep an angular rate of the array antenna around an azimuth axis to nearly 0 even while no signals can be received from the target. Even when signals can be received from the target, a control system is stabilized by feedback of the angular rate.
REFERENCES:
patent: 4418350 (1983-11-01), Rosen
patent: 5223845 (1993-06-01), Eguchi
patent: 5227806 (1993-07-01), Eguchi
patent: 5241319 (1993-08-01), Shimizu
patent: 5359337 (1994-10-01), Eguchi
"8 Elements Spiral Array Antenna for Mobile Satellite Communications" Electronic Information Communications Society, Nat'l. Spring Convention--1988, B-116, Akio Kuramoto et al.
Blum Theodore M.
Japan Radio Co. Ltd.
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