Patent
Microwave landing system
TLDR
In this article, the authors proposed a fixed beam guidance system based on the concept of using paired fixed overlapping beams, sequentially radiated by different fixed antennas, for small airports.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.read more
Citations
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References
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Patent
Advanced instrument landing system
TL;DR: In this article, a system for landing an aircraft is described, using a ground installation and an airborne installation which are synchronized together using GPS system time, where the ground installation includes a ground transmitter which radiates the sequence of signals which provide precision guidance information to the aircraft, an aircraft installation which includes a radio receiver and a processor to receive and process the transmitted guidance signals and to provide indications to aid the pilot in landing the aircraft.
Patent
Integrated antenna aperture
TL;DR: In this paper, a microwave landing system employing a phased array antenna for the generation of narrow, scanning guidance beams in which broad beam antennas used for transmitting identification signals, fly-left, fly right guidance signals and the like with broad coverage are eliminated by applying spoiling phases to the phase shifters of the array thereby broadening the beam shape of the arrays to a pattern substantially identical to the pattern of a broad beam antenna formerly used.
Patent
Independent landing monitoring system
TL;DR: In this article, an independent landing monitoring system (ILM) for guiding airborne vehicles on final approach to a landing using a ground-based beacon which transmits a sequence of pulse signals including an omnidirectional signal coded to identify its location and used for initial approach, followed by time spaced directionally radiated right/left and up/down signals used for precision guidance along the final approach path.
Patent
Monitoring system for scanning-beam microwave landing apparatus
TL;DR: Hofgen et al. as discussed by the authors used a time reference scanning-beam microwave landing system which supplies directional information throughout a 40degree to 60degree landing approach sector, where transponders are provided within the radiation field of the directional antenna of the landing system, these being directionally separated.
Book ChapterDOI
Microwave Landing System: The New International Standard
TL;DR: In this paper, the authors present the draft standards and recommended practices (SARPS) form a concise description of a basic and an expanded microwave landing system configuration, and discuss the rationale for the accuracy requirements, the sources of error in MLS, factors that affect the power received at the aircraft, the considerations in siting an MLS system in existing airport configurations, examples of MLS performance, and the monitoring of the signal to provide system integrity.