| 摘要 |
In a Microwave Landing System (MLS) transmitting landing guidance signals and data signals according to a time division multiplex signal format, a method and means for replacing faulty primary equipment with standby equipment. Redundant electronics units are provided for generating guidance and data signals. Transfer control means connect alternate ones of the electronics units to the appropriate antenna of the system such that no two consecutive transmissions of the same guidance or data signal is made by the same electronics unit. The signals transmitted by the system are monitored for accuracy and conformity to the signal format. If a fault is detected in a monitored signal, the electronics unit responsible for generating the faulty signal is no longer used and system operation continues with non-faulty units, unless the faulty detected indicates antenna misalignment. If antenna misalignment occurs, system operations are halted.
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