Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1985-04-04
1987-01-06
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342 35, G01S 116
Patent
active
046350640
ABSTRACT:
The invention provides independent guidance and monitoring to be integrated into an MLS landing system and also provides a scaled-down MLS landing guidance system useable at small airports. In both cases an added fixed beam precision guidance system is integrated into the MLS time sequence format. The fixed beam guidance system is based upon the concept of using paired fixed overlapping beams, sequentially radiated by different fixed antennas. One pair is oriented to left and right of the centerline of the runway, and the other pair is oriented above and below the desired glideslope. The first set of paired beams overlap at the centerline of the runway in such a manner that an aircraft approaching exactly on centerline will intercept equal signal intensities to indicate an on-course approach. Conversely when the aircraft is off-course to one side of the centerline, it will intercept a stronger signal intensity for the fixed guidance beam which is directed to that side of the centerline and a weaker signal intensity for the fixed beam which is directed to the other side of the centerline. Similar operation is provided by the overlapped guidance beams operating in the elevation mode.
REFERENCES:
patent: 4306238 (1981-12-01), Enein
patent: 4306239 (1981-12-01), Enein
patent: 4333081 (1982-06-01), Hofgen
patent: 4429312 (1984-01-01), Chisholm
Microwave Landing System-The New International Standard, Redlien & Kelly, Bendix Corp. - From Advances in Electronics & Electron Physics, vol. 57, pp. 311-410.
Blum Theodore M.
Cain David C.
Gabala James A.
Killingsworth Ted E.
Sundstrand Data Control Inc.
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