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This paper contains an assessment of the stability of MLS angle antennas. The analysis contains a breakdown of the MLS angle error budget, from the system error to the ground equipment, environment, and propagation error sources. An assessment is made of MLS field data collected over a 12 month period from the Hazeltine Model 2600 MLS installed at the FAA Technical Center in Atlantic City, New Jersey...
Testing has indicated the sensitivity of the performance of Microwave Landing System antennas to the presence of water on the antenna radomes. Effects include degradation of system accuracy, effective radiated power, and system monitoring. Research has also been conducted in an attempt to find suitable radome materials with water shedding (hydrophobic) properties that would eliminate the problem....
Rick Cassell has 19 years experience working with MLS. He has extensive experience in analyzing MLS integrity and continuity of service. He has worked for the last ten years as an advisor to the U.S. representative on the International Civil Aviation Organization All Weather Operations Panel. He has a Bachelor's Degree in Electrical Engineering from Villanova University.
Multilateration (MLAT) surveillance is now being used in all types of airspace for air traffic management. MLAT can be used for airport surface movement surveillance as well as for terminal and en route surveillance, using Wide Area Multilateration (WAM). MLAT is a low-cost technology that not only has major advantages in operations and maintenance, but also provides excellent performance under all...
This paper addresses system design aspects that should be considered in designing Microwave Landing Systems (MLS) to meet Category III Continuity of Service Requirements. Experience with Instrument Landing Systems (ILS) has shown that the continuity of service achieved in the field is at least two times worse than performance prediction based on equipment reliability. This is primarily due to outages...
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