Monitor for the instrument-landing system

Details Monitor for the instrument-landing system Monitor for the instrument-landing system

G - Physics

01

S

343/1

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

Patent

CA 1139408

H. Vogel 5-1-1 MONITOR FOR THE INSTRUMENT- LANDING SYSTEM Abstract of the Disclosure A Monitor located about 100 m from the ILS localizer determines whether the DDM alarm threshold was exceeded due to an equip- ment error or to an error caused by an overflying aircraft. To accomplish this, either the maximum of the frequency spectrum of the variation with time of the differentiated DDM signal is located, or the frequency spectrum of the variation with time of the DDM signal or of the differentiated DDM signal is compared with one or a plurality of spectra typical of equipment errors or of errors caused by overflying aircraft.

341151

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