En-route Multilateration System Based on ADS-B and TDOA/AOA for Flight Surveillance Systems

The traditional radar techniques are not suitable for the precise positioning of the aircraft with the rapid development of air traffic. Automatic dependent surveillance-broadcast (ADSB) is one of the most important technologies in the field of air traffic control. Unfortunately, the ADS-B technique is prone to cyber threats due to its open architecture. In order to validate the ADS-B signal and to enhance positioning accuracy of en-route aircraft, an approach unite the technology of ADS-B and multilateration (MLAT) is presented, where a dynamic flight model of aircraft is utilized. We use MLAT to overcome the problems caused by the drawbacks of ADS-B. Moreover, we propose a hybrid time-difference-of-arrival/angle-of-arrival (TDOA/AOA) positioning technology using Extened Kalman Filters (EKF) for ADS-B/MLAT positioning system. The experimental results show that the hybrid technology can improve the position accuracy and enhance the robustness of the surveillance systems.