Evaluation of Instrument Landing System DDM (Difference in Depth of Modulation) Calibration Accuracies.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1983
- Accession Number
- ADA138301
Entities
People
- D. M. Mccollum
Organizations
- Air Force Institute of Technology