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This final report covering over three-years' work on ILS improvement and alternative uses gives results of Ohio University's evaluation of localizer and glide-slope systems emphasizing antenna and monitor performance, terrain effects and the effects of obstructions. Also, details of analyses and flight evaluations of Alford and Hollins localizer systems are provided together with findings during evaluations of the Watts Mark 1, 2, and 3 endfire, glide-slope systems. Technical results of developement and evaluation work on the FAA-suggested techniques for determining range-rate and position during approach using the localizer signal are given. Non-destructive ILS system fault testing techniques are described, as is a plan for development of an airport systems control/display facility. Further, special devices and techniques for use in ILS field work such as a mini-laboratory for collection of airborne data, digital data collection system, time domain reflectometry, and mathematical modeling to predict localizer and glide slope performance and facilitate setups are discussed. (Author)

This final report covering over three-years' work on ILS improvement and alternative uses gives results of Ohio University's evaluation of localizer and glide-slope systems emphasizing antenna and monitor performance, terrain effects and the effects of obstruction. Also, details of analyses and flight evaluations of Alford and Hollins localizer systems are provided together with findings during evaluations of the Watts Mark 1, 2, and 3 endfire, glide-slope systems. Technical results of development and evaluation work on the FAA-suggested techniques for determining range-rate and position during approach using the localizer signal are given. Non-destructive ILS system fault testing techniques are described, as is a plan for development of an airport systems control/display facility. Further, special devices and techniques for use in ILS field work such as a mini-laboratory for collection of airborne data, digital data collection system, time domain reflectometry, and mathematical modeling to predict localizer and glide slope performance and facilitate setups are discussed. (Author)