I.L.S. (Instrument Landing System) simulation : positional control

Abstract

The Instrument Landing System (ILS) principle is based on directional radio beams modulated so as to enable airborne equipment to identify the beam centres, hence defining the correct approach to a particular runway. The total system comprises of three parts, each with a transmitter on the ground and receiver and signal processor on the aircraft. Lateral steering is provided by the localizer; the glide slope provides vertical steering and the marker beacons give the distance checks. The aim of this project is to simulate the above, using infra-red beams, and using this in formation so as to control stepper-motors for vertical and horizontal steering. Hence the system can be considered as an exercise in positional control.