| 摘要 |
PURPOSE: An apparatus for controlling a mobile satellite antenna using an ultrasonic motor is provided to improve reception state of a satellite signal by controlling the driving of the ultrasonic motor according to satellite tracking of the satellite antenna. CONSTITUTION: A system controller(110) checks an automatic gain control value, which is outputted as a digital signal, through an analog/digital converter to generate a control signal of a satellite antenna so as to maintain optimally the reception sensitivity of a corresponding channel. An ultrasonic motor driver(120) oscillates a high frequency signal for a driving of an ultrasonic motor by a control signal outputted from the system controller(110) to control speed and position of a motor. An ultrasonic motor(130) moves rotationally a mobile satellite antenna by a driving control of the ultrasonic motor driver(120). The ultrasonic motor driver(120) includes a pulse generator and an ultrasonic oscillation generator. The pulse generator generates a rotational pulse and a rotational direction signal for driving the ultrasonic motor(130) by a non-power stop input signal and a rotational control signal outputted from the system controller(110). The ultrasonic oscillation generator generates an ultrasonic for driving the ultrasonic motor(130) according to the rotational pulse and the rotational direction signal outputted from the pulse generator.
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