NDLI: Scanning-beam microwave landing system--Multipath-errors and antenna-design philosophy

Content Provider	IEEE Xplore Digital Library
Author	Lopez, A.
Copyright Year	1963
Abstract	Multipath reception can cause guidance-angle errors in a microwave landing system (MLS). The antenna radiation-control problem for a scanning-beam MLS is defined and analyzed. "Centerline emphasis" is presented as a helpful design philosophy for the ground antennas. It is shown that the maximum guidance-angle error is proportional to 1) the amplitude of the indirect signal, 2) the antenna beamwidth, and 3) the time derivative of the indirect signal as the direct beam-peak scans by the receiver. This result is used in developing a rationale for the selection of the antenna beamwidth and sidelobe level (aperture size and excitation) for the azimuth and elevation guidance functions.
Sponsorship	IEEE Antennas and Propagation Society
Starting Page	290
Ending Page	296
Page Count	7
File Size	577563
File Format	PDF
ISSN	0018926X
Volume Number	25
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1977-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Microwave antennas Multilevel systems Airports Optical reflection Azimuth Aircraft Receiving antennas FAA Aperture antennas Instruments
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering

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Scanning-beam microwave landing system--Multipath-errors and antenna-design philosophy