A Software Centered Signal Model for the Microwave Landing System

D. Vickers

Abstract:	A software centered model of the Microwave Landing System (MLS) signal-in-space is being developed for use as input to aircraft computer simulations which support integration of MLS signals with autopilots and flight management systems, The signal model design responds to the need for estimates of the guidance accuracy and quality at various points throughout the large coverage volume near centerline and at the limits of coverage. This model provides sampled signal outputs, appropriate flags (warnings) and deviation display outputs in a manner analogous with actual system operation. Primary equipment and propagation error sources are tabulated or computed by the model as a function of azimuth and elevation angles and the range (DME) coordinate. The stationary error sources are modeled from a structured analysis of flight error records, while the biases and lower frequency equipment errors are based on maximum value limits found in equipment specifications, The errors from these various sources are summed, filtered and delivered to the aircraft simulation at rates scaled to the actual signal-in-space.
Published in:	Proceedings of the 1988 National Technical Meeting of The Institute of Navigation January 26 - 29, 1988 Santa Barbara, CA
Pages:	264 - 268
Cite this article:	Vickers, D., "A Software Centered Signal Model for the Microwave Landing System," Proceedings of the 1988 National Technical Meeting of The Institute of Navigation, Santa Barbara, CA, January 1988, pp. 264-268.
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