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ILS Mathematical Modeling Study of an ILS Localizer and Glide Slope Proposed for Runway 32R, Moffett Field Airport, California.

N9233308

Publication Date	1992
Personal Author	Rambone, J. D.
Page Count	29
Abstract	Described here is the instrument landing system (ILS) math modeling performed by the Federal Aviation Administration (FAA) Technical Center at the request of the NASA-Ames Research Center Aircraft Operations Division. Computed localizer data are presented showing the effects of three large airship hangars on the performance of an ILS localizer proposed for runaway 32R at the Moffett Field Airport. There is concern that reflections from the large airship hangars may degrade the localizer course beyond Category I tolerances. A 14/6 dual-frequency localizer antenna system, a Redlich system, and a Wilcox 14/10 system (currently under development) were modeled at the proposed localizer site. Modeled course structure results for a 14/6 dual-frequency antenna exceed Category I tolerance limits. Modeled course structure results indicate that Category I localizer performance should be obtained with a Redlich antenna system or a Wilcox 14/10 antenna system installed at the proposed location. Computed clearance orbit results for the Redlich antenna and Wilcox 14/10 system indicate satisfactory linearity, course crossover, and signal clearance levels. Data are also presented showing the computed performance for a glide slope proposed for runaway 32R at Moffett Field Airport. As requested, a capture effect system was modeled at the proposed glide slope site located 1,038 feet back from runaway threshold and 400 feet right offset of centerline. Glide slope modeling computed only the effect of terrain on glide slope performance using the Geometric Theory of Diffraction-3D (GTD-3D) model. Modeled path structure and level run plots are provided for the proposed capture effect system. Results indicate that a capture effect system modeled at the proposed site should meet Category I path structure, linearity, and symmetry tolerances.
Keywords	Glide paths Instrument landing systems Mathematical models Runways Airports Airships Antenna design Hangars Capture effect Clearances Flight operations Linearity Position (Location) Project management Symmetry Systems engineering Terrain
Source Agency	National Aeronautics and Space Administration
NTIS Subject Category	85A - Air Transportation 50B - Civil Engineering
Corporate Authors	Federal Aviation Administration Technical Center, Atlantic City, NJ.
Document Type	Technical Report
Title Note	Technical Report, May 1992.
NTIS Issue Number	199303
Contract Number	FAA-T0603-S

ILS Mathematical Modeling Study of an ILS Localizer and Glide Slope Proposed for Runway 32R, Moffett Field Airport, California.

ILS Mathematical Modeling Study of an ILS Localizer and Glide Slope Proposed for Runway 32R, Moffett Field Airport, California.
N9233308

Publication Date	1992
Personal Author	Rambone, J. D.
Page Count	29
Abstract	Described here is the instrument landing system (ILS) math modeling performed by the Federal Aviation Administration (FAA) Technical Center at the request of the NASA-Ames Research Center Aircraft Operations Division. Computed localizer data are presented showing the effects of three large airship hangars on the performance of an ILS localizer proposed for runaway 32R at the Moffett Field Airport. There is concern that reflections from the large airship hangars may degrade the localizer course beyond Category I tolerances. A 14/6 dual-frequency localizer antenna system, a Redlich system, and a Wilcox 14/10 system (currently under development) were modeled at the proposed localizer site. Modeled course structure results for a 14/6 dual-frequency antenna exceed Category I tolerance limits. Modeled course structure results indicate that Category I localizer performance should be obtained with a Redlich antenna system or a Wilcox 14/10 antenna system installed at the proposed location. Computed clearance orbit results for the Redlich antenna and Wilcox 14/10 system indicate satisfactory linearity, course crossover, and signal clearance levels. Data are also presented showing the computed performance for a glide slope proposed for runaway 32R at Moffett Field Airport. As requested, a capture effect system was modeled at the proposed glide slope site located 1,038 feet back from runaway threshold and 400 feet right offset of centerline. Glide slope modeling computed only the effect of terrain on glide slope performance using the Geometric Theory of Diffraction-3D (GTD-3D) model. Modeled path structure and level run plots are provided for the proposed capture effect system. Results indicate that a capture effect system modeled at the proposed site should meet Category I path structure, linearity, and symmetry tolerances.
Keywords	Glide paths Instrument landing systems Mathematical models Runways Airports Airships Antenna design Hangars Capture effect Clearances Flight operations Linearity Position (Location) Project management Symmetry Systems engineering Terrain
Source Agency	National Aeronautics and Space Administration
NTIS Subject Category	85A - Air Transportation 50B - Civil Engineering
Corporate Authors	Federal Aviation Administration Technical Center, Atlantic City, NJ.
Document Type	Technical Report
Title Note	Technical Report, May 1992.
NTIS Issue Number	199303
Contract Number	FAA-T0603-S