Keywords

Distance measuring equipment (Aircraft to ground station), Pulse-pair spacing simulation, Binary coded decimal to timing conversion, Up/down range-rate counters, Programmable modulo-n frequency divider, Thumbwheel distance input

Abstract

This report summarizes the design of a DME (Distance Measuring Equipment) simulator to be used in the testing of an Area Navigation System. The purpose of the simulator is to generate a signal representing an aircraft's distance from a ground station. This information is in the form of two pulses whose separation represents that elapsed transmission time for an aircraft to receive a reply from the ground station to an interrogation by the aircraft. The pulse spacing must be selectable as fixed distances for static tests and as distance changing at a constant rate to simulate flying to or from the station for dynamic testing. Thumbwheel switches are used to input fixed distances and up/down counters provide inbound and outbound range rates. The rate clock is derived from a crystal oscillator whose output is divided down by a programmable, modulo-n, divider to the desired rate/frequency. This input distance information, available in parallel binary coded decimal format, is then converted to the required pulse pair spacing. This is accomplished with presettable down counters clocked by another crystal oscillator whose frequency represents two-way propagation time for radio waves.

Notes

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Graduation Date

1974

Advisor

Petrasko, Brian E.

Degree

Master of Science (M.S.)

College

College of Engineering

Format

PDF

Pages

50 pages

Language

English

Rights

Public Domain

Length of Campus-only Access

None

Access Status

Masters Thesis (Open Access)

Identifier

DP0012657

Subjects

Distance measuring equipment (Aircraft to ground station); Aids to navigation--Simulation methods; Pulse generators--Design and construction; Pulse modulation (Electronics)--Testing; Frequency synthesizers--Design and construction

Collection (Linked data)

Retrospective Theses and Dissertations

Accessibility Status

Searchable text

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