ABNORMALITY DETECTION METHOD FOR ANTENNA TRACKING CONTROL SYSTEM

摘要

PURPOSE:To detect an abnormality in a tracking control system on the preliminary side independently of the present use side by applying a false RF differential signal modulated as prearranged to the preliminary system and monitoring the output of a speed dynamo on the preliminary side through the intermediary of an antenna drive motor on the preliminary side. CONSTITUTION:The tracking drive of an antenna 10 based on a prearranged pattern is controlled through the intermediary of a currently used motor 8 to be controlled through feedback by each device of the current use. In this case, a false RF differential signal modulated according to a pattern from a pattern modulator 22 is applied to an auxiliary motor 17 through an auxiliary trackig reception device 3, an auxliary control amplification device 5, an auxliary drive power amplification device 7, etc. which make up a preliminary system. Then a speed power generation output generated by an auxiliary machogenerator 18 following the turning of the motor 17, is compared with a pattern signal which is output by a pattern generator 21 to which a false RF differential signal is added. An abnormality identification circuit 24 detects an abnormality in the preliminary-side tracking control system independently of the currently used system at time of the operation of the currently used system. Thus it is possible to prevent the deterioration of an operating rate due to an abnormality in the preliminary system.