Instrument Landing System Improvement Program.
Abstract
Five years of work to improve the performance and availability of the VHF-UHF Instrument Landing System is described; four in synopsis and the fifth in detail. Concentration has been on studies of the causes of path derogation and the optimum remedies for these. Mathematical analysis and computer simulations have been developed and, wherever possible, tested against real world conditions. This has resulted in recommended critical area specifications where the derogation is due to parked or taxiing large aircraft, siting procedures and site preparation and modification recommendations. Monitoring of glide slope and localizer for Category II and III operation has been emphasized. The use of analog integral monitors with supplementary tilt monitors and far-field monitors is researched. Environmental effects such as snow which are often overreacted to by near-field monitors require some type of far-field monitoring. Below path monitors for the glide slope and special precision techniques for Category III localizer are developed and discussed. A preliminary study for a single frequency time shared capture effect system is presented. A number of special problems and their proposed solutions are presented. Work on the development of an automatic radio telemetering theodolite is presented describing both a dynamic and a static version. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1974
- Accession Number
- ADA020162
Entities
Organizations
- Ohio University