Single-antenna projection algorithm for Mode S based airport traffic surveillance

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Single-antenna projection algorithm for Mode S based airport traffic surveillance

Piracci, E.G. / Petrochilos, N. / Galati, G.

Within the Surveillance function in the A-SMGCS frame, Multilateration (MLAT) systems are being more and more used for location and identification of aircraft and of cooperating vehicles on the airport surface. This situation, with increasing traffrc in the downlink SSR channel, may lead to a too high number of superimposed, i.e. garbled, signals. The aim of this work is the need for reliable, simple effective algorithms to separate overlapped SSR signals. We proposed earlier some solutions, as well others can be found in the literature. All of them require an array antenna at the receiver stations, while today's receiver stations are equipped with only one omni-directional antenna. In this paper, the sources separation algorithm based on array processing (PA: Projection Algorithm) is adapted to a single-antenna configuiation, where the variation of carrier frequencies of different vehicular transponders is exploited. Simulations with signals synth-esized from real measurements give results that demonstrate the effectiveness of the algorithm in a frequency agility environment.