STANDARD DIRECTIONAL LOCALIZER OVERFLIGHT INTERFERENCE
Abstract
This report describes the reflection interference effects of overflying aircraft on ILS localizer receivers in the landing area. The data were derived from field tests and mathematical analysis, and include both static and dynamic receivers. Field test data were gathered using a standard directional waveguide localizer. A typical volume in which one aircraft would cause interference to a second aircraft that is in a landing configuration near touchdown is presented. Here the interfered aircraft is landing at 210 fps, 10,000 ft from the localizer, and the interfering aircraft is a DC-3 traveling in the same direction at 340 fps. Interference volumes will have different geometries and positions depending upon geometry and velocities of the aircraft, cross section of the interfering aircraft, beam structures of the antennas, and criteria used for interference. Interference volumes are limited in azimuth to plus and minus 8 degrees. Interference volumes are limited in altitude by the RF cross sectional area of the interfering aircraft and the vertical lobe structure of the localizer antenna. Volumes of interference parallel to the runway that are generated by aircraft flying parallel to the runway are primarily limited by the frequency of the interference.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1962
- Accession Number
- AD0407062
Entities
People
- F. W. Marschall