| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently separate the number of peculiar vibrations in the rotat ing direction of a driving shaft in a gimbal part from the number of the peculiar vibrations of a nearby sensor and suppress structural resonance between them, by changing the inertia coefficient of the driving shaft of the gimbal part in the rotating direction. SOLUTION: Since the distance of a balancer 9 provided for the supporter 5 of an antenna 4 is the gimbal part from the driving shaft 6 is one of parameters deciding the inertia coefficient of the driving shaft 6 in the rotating direction, the distance of the balancer 9 from the driving shaft 6 is changed. Thus, the number of the peculiar vibrations in the rotating direction of the driving shaft 6 changes. Since the distance of the balancer 9 from the driving shaft 6 is changed by the gain control of a servo mechanism 10, the controller 11 controls the gain of the servo mechanism 10 so that the number of peculiar vibrations in the rotating direction of the driving shaft 6 is sufficiently separated from the number of the peculiar vibration of the sensor 8. Thus, structural resonance between the shaft and the sensor is avoided by sufficiently separating the number of peculiar vibrations in the rotating direction of the driving shaft 6 from the number of the peculiar vibrations of the sensor 8. |
