Method of controlling a non-geostationary satellite antenna posi

Details Method of controlling a non-geostationary satellite antenna posi Method of controlling a non-geostationary satellite antenna posi

1996-07-23

1998-03-17

Hajec, Donald T.

Communications: radio wave antennas

Antennas

With means for moving directive antenna for scanning,...

343757, 343765, 342359, H01Q 300

Patent

active

057292400

ABSTRACT:
A tracking antenna for non-geostationary satellites is mounted on a three-axis positioner comprising an azimuth axis, an elevation axis mounted perpendicularly on the azimuth axis and a pseudo-azimuth axis mounted perpendicularly on the elevation axis and supporting the antenna. The positions of the axes are controlled by a pointing unit. The method of pointing the antenna carries out the following steps simultaneously when the position of the satellite is such that the elevation axis exceeds a predetermined elevation value: modifying the position of the azimuth axis at constant speed and modifying the position of the elevation axis and the pseudo-azimuth axis to track the satellite. The second of these steps uses the following equations: ##EQU1## in which X' and Y' are respectively the positions of the elevation axis and of the pseudo-azimuth axis, Az(t) and El(t) are respectively the azimuth and elevation coordinates of the satellite relative to the antenna, the coordinates Az(t) and El(t) are obtained from ephemeris tables, Az.sup.* (t) is equal to Az(ti)+V.sub.Az.(t-ti), V.sub.Az is the rotation speed of the azimuth axis and ti is the time at which the initial position of the satellite is such that the elevation axis exceeds a predetermined elevation angle.

REFERENCES:
patent: 4994815 (1991-02-01), Nakayama
patent: 5194874 (1993-03-01), Perrotta
patent: 5223845 (1993-06-01), Eguchi
patent: 5227806 (1993-07-01), Eguchi
patent: 5359337 (1994-10-01), Eguchi
patent: 5594460 (1997-01-01), Eguchi

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