AUTOMATIC TRACKING ANTENNA DEVICE FOR RECEPTION OF SATELLITE

PURPOSE:To provide a compact, light-weight and inexpensive antenna device which can track a satellite in both horizontal and elevation direction by means of only a horizontal rotary driving means. CONSTITUTION:A beam tilt plane antenna 10 and a beam reflecting plate 16 are rotatably set to a round fixed base 13 via the rotary frames 15a and 15b. A controller 19 drives the motors 21 and 22 in response to the level of the reception signal sent from the antenna 10 via a low noise block converter 12 and turns the antenna 10 and the plate 16 via both frames 15a and 15b to acquire the highest level of the reception signal. Thereafter the controller 19 controls the drive of both motors 21 and 22 based on the azimuth signal supplied from a position sensor 20 and also based on the change of the azimuth signal supplied in accordance with the azimuthal variance of a vehicle body and holds a plane antenna 11 and the plate 16 in the arriving direction of the satellite radio wave in order to always acquire the highest level of the reception signal.