Abstract: A rotation determiner determines whether an antenna azimuth (AZ) angle rotates beyond a rotation range within a predetermined time based on a predicted orbit value. When the antenna AZ angle rotates beyond the rotation range, an orbit determiner determines whether an estimated satellite position is within a drivable range that the AZ angle rotates from a reference value beyond the rotation range. When the AZ angle rotates beyond the rotation range and the estimated satellite position is within the drivable range, three-axis control is executed, and the AZ angle is kept at a predetermined value. When the AZ angle rotates beyond the rotation range and the estimated satellite position is not within the drivable range, or when the AZ angle does not rotate beyond the rotation range, two-axis control is executed.

Abstract: A rotation determiner determines whether an antenna azimuth (AZ) angle rotates beyond a rotation range within a predetermined time based on a predicted orbit value. When the antenna AZ angle rotates beyond the rotation range, an orbit determiner determines whether an estimated satellite position is within a drivable range that the AZ angle rotates from a reference value beyond the rotation range. When the AZ angle rotates beyond the rotation range and the estimated satellite position is within the drivable range, three-axis control is executed, and the AZ angle is kept at a predetermined value. When the AZ angle rotates beyond the rotation range and the estimated satellite position is not within the drivable range, or when the AZ angle does not rotate beyond the rotation range, two-axis control is executed.

Abstract: An antenna control device includes a direction acquirer to acquire a target direction in which a target object to be tracked exists, a coordinate converter to perform conversion into an Y-coordinate which is an angle between the target direction and a plane containing both the zenith direction and a Y-axis fixed horizontally within a rotation range of the vertical axis, and into a X-coordinate which is an angle between the zenith direction and a projection of the target direction projected onto the plane. A drive command value arithmetic processor commands a vertical axis angle value obtained by multiplying the Y-coordinate by a coefficient. The arithmetic processor calculates the command value for each of the horizontal axis and the cross horizontal axis such that difference between the pointing direction of the antenna and the target direction is less than or equal to an allowable value.

Abstract: An antenna control device includes a direction acquirer to acquire a target direction in which a target object to be tracked exists, a coordinate converter to perform conversion into an Y-coordinate which is an angle between the target direction and a plane containing both the zenith direction and a Y-axis fixed horizontally within a rotation range of the vertical axis, and into a X-coordinate which is an angle between the zenith direction and a projection of the target direction projected onto the plane. A drive command value arithmetic processor commands a vertical axis angle value obtained by multiplying the Y-coordinate by a coefficient. The arithmetic processor calculates the command value for each of the horizontal axis and the cross horizontal axis such that difference between the pointing direction of the antenna and the target direction is less than or equal to an allowable value.