In 2002, we proposed a new aircraft positioning system. The system uses Aircraft Collision Avoidance System (ACAS) signals to determine aircraft's positions. To evaluate the surveillance performance of the system, we have developed an experimental system for airport surface surveillance and conducted an evaluation. In this paper, we describe the background of our development and introduce the experimental system and Time Difference Of Arrival (TDOA) detection techniques. We present the results of the evaluation conducted in the Sendai Airport in 2003.
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