United States Department of Transportation
i
Course structure-runway 28R San Francisco Airport.
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1973-09-01
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[PDF-1.02 MB]
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Abstract:The TSC electromagnetic scattering model is used to dtermine the expected ILS localizer performance for the planned 28R runway at San Francisco airport. It is found that the V-Ring and the 14/6 Alford array as well as the larger 22/8 Alford array operating with a 10db "capture effect ratio, " do not produce an acceptable course meeting FAA Categor I tolerances. The feasibility and advantages of operating the Alford array at higher capture effect ratios is discussed. Based on a "worst case" airport enviroment, the maximum capture ratio obtainable with the Alford 22/8 array is calculated and shown to lead to a marginally acceptable Category I course structure. For an "ideal" airport environment it is possible to use high capture ratios with the result that Category I requirements are easily satisfied and Category II tolerances marginally so with the Alford 22/8 array. The course structure in each case has been calculated under the assumption that the derogator is a metallic perfect reflector.
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