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The time reference scanning beam Microwave Landing System (MLS) is an air derived system, whereby airborne receivers decode continuous ground system data to provide guidance information indicating vertical and lateral displacement from a selected flight profile. It is expected that MLS, within ten years, will replace the Instrument Landing System (ILS) as a precision landing aids to aircrafts in most...
A model for determining the antenna phase center and its movement due to multipath reception is defined and analyzed. It is shown that for the azimuth antenna in the Microwave Landing System (MLS) the phase center is susceptible to interaction of the direct signal and the indirect signals reflected by the ground.
An antenna pattern measurement system has been developed which operates over the frequency range 1 to 12.4 GHz. The system makes pattern measurements and tests gain, beamwidths, and sidelobe levels under far-field conditions. Measurements using a Hewlett-Packard 8410A vector network analyzer as the receiver are managed by an in-house-developed software package for use on an IBM PC-AT microcomputer.
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