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

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

G - Physics

01

S

343/73

G01S 7/40 (2006.01) G01S 1/02 (2006.01) G01S 1/56 (2006.01)

Patent

CA 1325261

ABSTRACT OF THE DISCLOSURE The fault monitoring function of an executive monitor contained in a microwave landing system is veri- fied by evaluating a history of the parametric informa- tion 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, generat- ing an alarm if said sum is beyond the second predeter- mined 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. -19-

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