Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1981-11-20
1983-11-15
Wilbur, Maynard R.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
G01S 116
Patent
active
044158998
ABSTRACT:
A monitor located about 100 m from the ILS localizer determines whether the DDM alarm threshold was exceeded due to an equipment 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.
REFERENCES:
patent: 3413638 (1968-11-01), Trim
patent: 3671967 (1972-06-01), Fries
patent: 3697997 (1972-10-01), Cooper
Jolliffe et al., "The Character of the Received I.L.S. Signal and Its Relation to Monitoring", Radio & Electronic Engineer, vol. 32, No. 2, Nov. 1966.
Idler Horst
Taruttis Arno H.
Vogel Horst
Burk Robert C.
International Standard Electric Corporation
Kristofferson T. E.
O'Neil W. T.
Wilbur Maynard R.
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