Accession Number : ADD007595

Title :   Multipath Discriminating Antenna System.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Christian,J Robert ; Mink,James W

Report Date : 09 May 1980

Pagination or Media Count : 11

Abstract : To reduce guidance errors in a microwave landing system from false signals reflected by objects along runways, the transmitting antenna radiates an elliptically polarized beam. At the airborne receiver an antenna, such as a pyramidal horn, maintains the separation of the horizontal and vertical components. These components are separated and then split on an equal power basis. One part of the vertical field component is shifted by 90 degrees and added to one part of the horizontal component in a detector, whose output is in effect like that of a circularly polarized receiver. The other parts of the horizontal and vertical components are separately detected. The outputs of the three detectors are combined in a multiplier, to yield a resultant output. For a very broad angular distribution the undesired reflected signals are strongly attenuated. (Author)

Descriptors :   *Patent applications, *Instrument landings, *Direction finding, *Microwave landing systems, *Multipath transmission, Transmitters, Receivers, Reflection, Antennas, Guidance, Signals, Runways, Errors, Airborne

Subject Categories : Direction Finding
      Air Navigation and Guidance
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE