Automatic, real-time fault monitor verifying network in a microw

Details Automatic, real-time fault monitor verifying network in a microw Automatic, real-time fault monitor verifying network in a microw

1987-04-20

1989-04-18

Orsino, Joseph A.

Communications: electrical

Aircraft alarm or indicating systems

Land-based landing guidance

342 35, 342408, 364429, 377 29, G08B 2900

Patent

active

048231274

ABSTRACT:
The fault monitoring function of an executive monitor contained in a microwave landing system is verified by evaluating a history of the parametric information sampled by an executive monitor and storing in memory the number of out of tolerance parametric signals received from an antenna means over a predetermined time period, replacing the stored number of out-of-tolerance parametric signals with a predetermined number that will be beyond a second predetermined limit if another out-of-tolerance parametric signal is added to said number, adding one such internally generated out-of-tolerance parametric signal to said predetermined number, generating an alarm if said sum is beyond the second predetermined limit, and restoring the previously stored number of out-of-tolerance parametric signals received from the antenna means if the alarm was generated, and shutting the system down if an alarm was not generated.

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patent: 4654582 (1987-03-01), Ito
patent: 4757316 (1988-07-01), Brault et al.

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