PURPOSE: To reduce tracking errors in tracking control without noticeably impairing the responsiveness by providing first control means for driving an antenna in a direction wherein the misalignment of an antenna attitude is corrected, second control means which change the antenna attitude and drift correcting means for updating a corrected value in a direction wherein an accumulated value becomes zero.
CONSTITUTION: First control means 4 drive an antenna Ant via driving means 141 in a direction so that the attitude misalignment of the antenna Ant due to the attitude change of a moving object with respect to a radio source is corrected at a velocity corresponding to the attitude changing velocity Yas of a moving object and a set corrected value. Thus, even while radio waves are interrupted by a tunnel or the like, the antenna is directed to the radio source. Second control means 4 change the attitudes of the antennas Ant via the driving means 141 and 151 in directions wherein received signal levels BSs are raised in correspondence therewith. Then, drift correcting means 4 accumulate vectors indicative of changes in an antenna attitude and update corrected values in a direction wherein an accumulated value becomes zero in correspondence with the accumulated value.
MIZUNO SADAMI
KATO EIJI
SEKINO KAZUHIKO
MORITA MAKOTO
MIKAWA TOSHIMASA
TOYOTA MOTOR CORP
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