| 摘要 |
PURPOSE:To eliminate noncontinuity in tracking motion and to select the shortest tracking direction, by establishing angles of conditions No.1 and No.2 and comparing them with bearing values by a comparison circuit. CONSTITUTION:The signal of a bearing angle signal generator 1, to which signals are given from a gyro-compass, and the signal of a bearing counter 4 are compared with each other by a comparator 2, and quick forwarding or slow forwarding of a deflecting motor 5 is controlled. At this time, No.1 condition angle alpha and No.2 condition angle beta are established by the tracking speeds so that comparison circuits 6 and 7 become high level when bearing values of the bearing angle signal generator 1 and the bearing counter 4 are lower than alpha, that comparison circuits 8 and 9 become high level when bearing values of the bearing angle signal generator 1 and the counter 4 are higher than beta, and that the signal for quick forwarding or slow forwarding can be obtained from NAND circuits 20 and 21. And therefore, it is possible to eliminate noncontinuity in tracking motion at zero degree (0 deg.) and also to shorten the follow-up time by selecting the shortest tracking direction. |
