Antenna control device and antenna apparatus

An antenna control device for controlling a pointing direction of an antenna of an antenna apparatus to be driven by an azimuth-elevation mount, the azimuth-elevation mount including:

• a fixed base;
• a vertical axis perpendicular to a horizontal plane, the vertical axis being a rotation axis that rotates in relation to the base;
• a vertical axis driver to drive and rotate the vertical axis;
• an azimuth angle mount to be rotated and moved by the vertical axis;
• a horizontal axis being horizontal and being a rotation axis that rotates in relation to the azimuth angle mount;
• a horizontal axis driver to drive and rotate the horizontal axis;
• an elevation angle mount to be rotated and moved by the horizontal axis;
• a cross horizontal axis perpendicular to the horizontal axis, the cross horizontal axis being a rotation axis that rotates in relation to the elevation angle mount;
• a cross horizontal axis driver to drive and rotate the cross horizontal axis;
• and
• an antenna to be rotated and moved by the cross horizontal axis;
• the antenna control device comprising:
• a direction acquirer to acquire a target direction in which a target object to be tracked by the antenna exists;
• a coordinate converter to convert a target conversion direction of interest for conversion into an X-coordinate and a Y-coordinate in relation to a Y-axis horizontally fixed within a rotation range of the vertical axis, an X-axis vertically fixed to the Y-axis and horizontally, and a Z-axis perpendicular to the X-axis and the Y-axis, the X-coordinate being an angle between the Z-axis and a projection of the target conversion direction projected on a YZ-plane containing the Y-axis and the Z-axis, the Y-coordinate being an angle between the YZ-plane and the target conversion direction;
• and
• a controller to calculate a command value for the vertical axis driver for rotating the vertical axis within the rotation range so that a mount azimuth angle between the Y-axis and a direction perpendicular to the horizontal axis in the horizontal plane is an azimuth rotation angle that is an angle obtained by multiplying, by a coefficient, the Y-coordinate obtained through the conversion of the target direction by the coordinate converter, and to calculate a command value for each of the horizontal axis driver and the cross horizontal axis driver so that a difference between the pointing direction and the target direction is less than or equal to an allowable value.