| 摘要 |
PURPOSE:To always maintain automatic tracking of antenna under a normal condition, by giving a function which detects existence of disturbance level fluctuation in received signals to an automatic antenna follower. CONSTITUTION:An integration operator circuit 5 integrates and outputs the levels of signals received through an antenna 1, receiver 3, etc., within a prescribed integrating time. Moreover, an integrated value discriminating circuit 6 compares the levels of two integrated values integrated with the prescribed integrating time and sets the antenna following mode in such a way that the mode can follow the step following systems of step angles which are respectively fixed in accordance with prescribed conditions or works to return the mode to the integrating operation starting time of the received signal levels which is carried out by the integration operator circuit 5. When the number of states which are decided as prescribed conditions by the integrated value discriminating circuit 6 exceeds the specific number of times within a specific measuring time of a time measuring circuit 8, a fading discriminating circuit 7 functions to change over the antenna tracking mode to a prearranged tracking mode at the prescribed direction angle.
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