Feasibility Study on Aircraft Location Accuracy Using Multilateration System in the Case of Addis Ababa Bole international Airport
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Date
2021-12
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Addis Ababa University
Abstract
The aviation sector must be safe. Information errors which are provided from ground aids Communication, Navigation and Surveillance (CNS) systems can put the aircraft at risk. Therefore, all ground-based flight aids should always be accurately calibrated. In addition, flight delays can lead to unnecessary fuel consumption and air pollution. Accordingly, in order to provide an efficient air transport system, it is important to have modern, fast and accurate ground based flight aids that provide real and timely information.
Air Navigation Aeronautical multilateration systems enable the localization of an aircraft based on the Time Difference of Arrival (TDoA) of its signal to three or more strategically placed receiving ground station antennas, located around an area of interest, providing continuous air traffic surveillance.
The main objective of this thesis is to show how to install an optimized multilateration system that can provide an aircraft information (position & identification) and to study the performance analysis of approach type multilateration systems in Ethiopia, specifically in Addis Ababa Bole international airport approach and terminal maneuvering area concerning radio coverage and aircraft location accuracy by considering ground stations’ location, their antennas radiation patterns, transmitted power, receiver sensitivity, and the corresponding parameters for the aircraft.
Line of Sight situation is assessed by taking into considerationof Digital Elevation, Fresnel’s Ellipsoid, and the Effective Earth’s Radius Models. The Free-Space Path Loss Model is likewise used, with fading margins being set to model power oscillations due to multipath and the airplane orientation uncertainty. The position accuracy of the aircraftis estimated from the system’s Geometric Dilution of Precision, taking into considerationof error components due to troposphere delay, multipath, receiver noise, quantization, and clock bias. The model will be implemented in a simulator with results in agreement with data from the literature and previously implemented systems.
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Keywords
MLAT, PSR, SSR, TDoA, ADS-B