Accession Number : ADA138301

Title :   Evaluation of Instrument Landing System DDM (Difference in Depth of Modulation) Calibration Accuracies.

Descriptive Note : Master's thesis Apr-Dec 83,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : McCollum,D M

PDF Url : ADA138301

Report Date : Dec 1983

Pagination or Media Count : 121

Abstract : Instrument landing system (ILS) accuracy is highly dependent upon the accuracy of the test instrumentation used in maintaining it. In an effort to upgrade calibration support to Air Force instrument landing systems, the Air Force Measurement Standards Laboratory requested an independent study be done on modulation factor and DDM accuracies. In this thesis report, ILS accuracy requirements are analyzed along with the accuracy specifications of test instrumentation. The report provides a short tutorial on ILS concepts in chapter II. In chapter III, modulation factor and DDM accuracy specifications have been compiled from various source documents. The evaluation, in chapter IV, looks at the adequacy of ILS test instruments and the ILS modulation factor and DDM calibration hierarchies. Based on the decision criteria used, it shows that existing instrumentation cannot adequately support all Categories of ILS. The significant results of the evaluation are summarized in chapter V along with the author's recommendations. (Author)

Descriptors :   *Instrument landings, Landing aids, Accuracy, Calibration, Glide slope, Approach, Instrumentation, Test equipment, Aviation safety, Navigational aids, Theses, Aircraft landings

Subject Categories : Flight Control and Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE