Tracking array antenna system

Communications: radio wave antennas – Antennas – With means for moving directive antenna for scanning,...

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343757, 342359, H01Q 300

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active

055944604

ABSTRACT:
A tracking array antenna system is provided. When a signal from the target is received normally, control mode of an AZ axis and an electronic XEL axis is changed over according to whether or not a moving platform is inclined about the XEL axis for detecting inclination of the moving platform. When the moving platform is not inclined, beam-switch (BSW) about the electronic XEL axis is performed, and the beam-switch tracking (BST) about the AZ axis using the result with an angular rate feedback (ARFB) is performed. When the moving platform is inclined, zero rate control (ZRC) about the AZ axis and BST about the electronic XEL axis are performed. In this way, tracking and stabilization are performed without not only the gimbal-lock but also the use of a gyrocompass.

REFERENCES:
patent: 5223845 (1993-06-01), Eguchi
patent: 5227806 (1993-07-01), Eguchi
patent: 5359337 (1994-10-01), Eguchi
patent: 5419521 (1995-05-01), Matthews
patent: 5420598 (1995-05-01), Uematsu et al.
patent: 5517204 (1996-05-01), Marakoshi et al.
Electronic Information Communications Society, National Spring Convention, 1988, B-116, "8 Elements Spiral Array Antenna for Mobile Satellite Communications", Akio Kuramoto et al., p. 116 (with English-language abstract) no month.

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