Mode S Technology
Glossary of Terms
ADS-B: Automatic Dependent Survelliance Broadcast. Next generation ATC system permitting air to air communication and air traffic coordination without the involvement of a ground station.
AOPA: Aircraft Owners and Pilots Association
ATC: Air Traffic Control
ATCAC: Air Traffic Control Advisory Committee
ATCRBS: Air Traffic Control Radar Beacon System
DABS: Discrete Address Beacon System (aka "Super Beacon", "Mode S")
FAA: Federal Aviation Administration
FRUIT: False Replies Uncorrelated in Time
Garble: data corruption caused by receiving multiple signal replies when only expecting one
IFF: Identify Friend or Foe - a system for electronically differentiating between friendly and enemy aircraft
LL: Lincoln Labs
modulation: the process in which a bitstream is converted to a waveform compatible with a transmission channel
Mode A: Transmission of unique identifer in ATCRBS by planes. Also used in Mode S.
Mode C: Transmission of altitude in ATCRBS by planes. Also used in Mode S.
Mode S: Mode Select - a bidirectional one-to-one data-link for ground to air communication
SLS: Sidelobe Suppression. A technique originally used in ATCRBS and employed in Mode S which temporarily suppress planes from responding to interrogation signals if a plane is hearing the leakage of signal directed to another plane (sidelobe). This prevents planes from responding to signals not intended for them.
TACAN: Tactical Air Navigation System
TCAS: Traffic Collision Avoidance System
TIS: Traffic Information System - a low-cost traffic collision and avoidance system based on the Mode S data-link