| 摘要 |
A control portion performs gyro control at control intervals of DELTA t, by using - omega G, which is obtained by inverting the polarity of an angular rate omega G outputted from an angular rate sensor portion. On the other hand, a receiving level is detected at constant control intervals of DELTA T (=M DELTA t: M is an integer). The rotation of an antenna portion is controlled by using omega s, if the receiving level has increased, or by using - omega s, if the receiving level has decreased, i.e. by step track control. By accumulating the control amount +/- omega s for a predetermined long time period of N DELTA T, accumulation of an error contained in each angular rate omega G is obtained. The accumulated value is then divided by N to calculate an error DELTA omega G contained in omega G. This error DELTA omega G is used to compensate the actual error, so that the gyro control can be made more accurate.
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