Development of WAMLAT System

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Dr. Seller Rudolf
Department of Broadband Infocommunications and Electromagnetic Theory

During my work for my Bachelor’s degree, I took part in the development of a multilateration system that is developed by the Budapest University of Technology and Economics (BME), Department of Broadband Infocommunications and Electromagnetic Theory’s Microwave Remote Sensing Laboratory, in association with HungaroControl Zrt. Wide Area MultiLATeration, called WAMLAT, is a position measurement system which allows the surveillance of civil aircrafts.

The first part of my thesis is about the operation theory. My task was to inspect three receiving stations around Budapest Airport with 3D coverage maps. The positions are decoded directly from the ADS-B signals, which come from the aircrafts’ SSR transponders to the ground stations in 1090 MHz. The system’s goal is to provide a full coverage of the country and to follow the departing and landing airplanes, therefore it is important to determine the lowest individual heights.

The second part of the thesis is about ASTERIX, which is an air traffic management surveillance data binary messaging format. It allows transmission of harmonised information between any surveillance and automation system. The purpose of the task was to create the transmission between the WAMLAT and the HungaroControl’s Surveillance Monitoring System (SMS). We are going to perform more analysis there, afterwards we will be able to compare the position results with the airport radar’s records. In the future this multilateration system could integrate into the HungaroControl’s air navigation service.


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