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Evaluating ILS and MLS Sites without Flight Tests

Published online by Cambridge University Press:  21 October 2009

P. R. Mahapatra
Affiliation:
Department of Aerospace Engineering, Indian Institute of Science
M. M. Poulose
Affiliation:
Officer-in-Charge, ACS NAAI, Bangalore Airport

Abstract

Instrument landing systems (ILS) and the upcoming microwave landing systems (MLS) are (or are planned to be) very important navigational aids at most major airports of the world. However, their performance is directly affected by the features of the site in which they are located. Currently, validation of the ILS performance is through costly and time-consuming experimental methods. This paper outlines a powerful and versatile analytical approach for performing the site evaluation, as an alternative to the experimental methods. The approach combines a multi-plate model for the terrain with a powerful and exhaustive ray-tracing technique and a versatile and accurate formulation for estimating the electromagnetic fields due to the array antenna in the presence of the terrain. It can model the effects of the undulation, the roughness and the impedance (depending on the soil type) of the terrain at the site. The results computed from the analytical method are compared with the actual measurements and good agreement is shown. Considerations for site effects on MLS are also outlined.

Type
Research Article
Copyright
Copyright © The Royal Institute of Navigation 1989

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References

REFERENCES

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