ADS Mode-S channel performance for aircraft surveillance using GPS positioning
M.S.K. Sushko · 2002
Mode S squitter technology is being considered as the basis of an automatic dependent surveillance (ADS) system. Under this proposal, aircraft positions would be determined by GPS equipped aircraft and the Mode S data link would be used to transmit the positional information, along with current Mode S usage. This paper studies the downlink data channel of the Mode S data link. The downlink channel is modeled as a random access ALOHA channel in both a fading and non-fading signal environments. The paper presents results for both unslotted (pure ALOHA) and slotted channel performance for Mode S GPS data traffic.