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Instrument Landing System Improvement Program

Results of ILS improvement studies performed at Ohio University are reported. The report is divided into sections ILS Glide Slope and ILS Localizer. Some of the topics treated under ILS Glide Slope are terrain effects and terrain grading criteria, snow effects, development of a directional glifr slope antenna with integral monitoring, siting problems at specific sites, and introductory work on reflections from large aircraft. The main topics treated under ILS Localizer are suppression of parasitics in the Scanwell localizer, study of augmentation of clearance generated by the Scanwell localizer, performance of the Scanwell array and three types of monitor under localizer fault conditions, reflection of localizer signals from hangars and from large aircraft, and preliminary work on design of a localizer array which produces clearance within a 35 degrees sector only.

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  • "Results of ILS improvement studies performed at Ohio University are reported. The report is divided into sections ILS Glide Slope and ILS Localizer. Some of the topics treated under ILS Glide Slope are terrain effects and terrain grading criteria, snow effects, development of a directional glifr slope antenna with integral monitoring, siting problems at specific sites, and introductory work on reflections from large aircraft. The main topics treated under ILS Localizer are suppression of parasitics in the Scanwell localizer, study of augmentation of clearance generated by the Scanwell localizer, performance of the Scanwell array and three types of monitor under localizer fault conditions, reflection of localizer signals from hangars and from large aircraft, and preliminary work on design of a localizer array which produces clearance within a 35 degrees sector only."@en
  • "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)."@en
  • "Results are presented of the fourth year technical investigations to provide improvement in ILS performance. Major emphases were on development of mathematical models for predicting (1) effects on the glide slope and localizer; and (2) effects of irregular ground on image-type glide slopes. The design, development and testing of an Automatic Tracking Radio Theodolite is reported upon as well as the effects of truncated grounds upon image glide slopes. Results have been obtained from analyses of snow cover effects on the glide slope, methods of minimizing parasitic currents in V-Ring Localizer arrays and the minimization of over-flight effects on localizer monitors. Conclusions and recommendations for improvements in the glide slope performance at specific sites are presented from work done in providing special consultations at Detroit and Pittsburgh."@en
  • "Results of technical investigations to provide improvement in ILS performance are presented. More than 12 separate tasks are reported with major emphases on integral analog monitoring for the glide slope and localizer, new localizer design for minimization of path perturbation due to multipath, and development of a mathematical model for predicting effects on the glide path of signals reflecting from jumbo aircraft. Also, results were obtained from analyses of snow cover effects on the glide path. Analyses to determine modulator and bridge tolerances are presented together with recommendations for revised tolerances. Specifications and tolerances are presented for preparation of the ground planes in the vicinity of image glide paths. These are based on previously developed mathematical models. Conclusions and recommendations for improvements in glide path performance at specific sites are presented."@en
  • "Two new analog-type monitors were designed, built and tested for the purpose of providing a reliable, and accurate representation of the ILS localizer signal as seen by an aircraft flying on an approach. One monitor involves detector pickups at the radiating antenna elements and the other uses seven directional elements located 300 feet in front of the localizer array. Both monitors are designed to give quantitative representations of conditions in the far-field which are generated by a wide aperture source. Mathematical models are described which are to be used for predicting effects on localizer path due to large reflecting surfaces such as hangars and large aircraft. From these models information can be derived as to the most critical placement of the reflecting surfaces. Calculations and discussions of the anomalous behavior of the glide paths at San Francisco, and Oakland, California are presented. (Author)."@en

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  • "Instrument Landing System Improvement Program"@en
  • "Instrument landing system improvement program"@en

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