Monitor for instrument landing system

Communications: electrical – Aircraft alarm or indicating systems – Land-based landing guidance

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Details

342413, G08G 500, G01S 116

Patent

active

051535874

ABSTRACT:
Disclosed is an improvement to Integral Monitoring of two-frequency Instrument Landing System Localizer transmitting antenna arrays, by means of which the Clearance signal can be precisely separated from the combined Course and Clearance output of an Integral Monitor recombiner and monitored as if it existed alone. A first detector detects a composite Clearance and Course signal input, and sends an output to a separation filter which does not pass frequencies of 0, 90 or 150 hertz, but does pass frequencies of the difference between Course and Clearance frequencies (.DELTA.f), .DELTA.f.+-.90 hertz, and .DELTA.f.+-.150 hertz. The output of the filter is input to a second detector which measures the difference between the percentages of 90 and 150 hertz amplitude modulations of an amplitude modulated carrier having a frequency .DELTA.f.

REFERENCES:
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patent: 3866228 (1975-02-01), Alford
patent: 4032920 (1977-06-01), Martin, Jr. et al.
patent: 4415899 (1983-11-01), Vogel et al.
patent: 4605930 (1986-08-01), Redlich
patent: 4907005 (1990-03-01), Redlich

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