Mode S has been established by ICAO as the standard for SSR surveillance due to those performance and functional limitations of the present system which are becoming increasingly significant. Whilst the initial implementation emphasis is on surveillance, Mode S also establishes the potential of SSR as an air/ground datalink.
IFATCA Policy is:The use of “Conspicuity Codes” of a Mode S identified aircraft within the Mode S area shall ensure that the safe operations of all other non-mode S units in that airspace e.g. military operations are not compromised. The controller HMI shall clearly distinguish correlated aircraft and aircraft only transmitting aircraft ID. ATC systems shall validate the Flight ID transmitted by an aircraft’s Mode S transponder and indicate to the controller any discrepancy with the ICAO aircraft identification in the flight plan. Any broadcast of incorrect ATM data should be corrected or if unable then: Switched off, or Marked as invalid. ATC surveillance systems shall be able to process all data, regardless of the volume or type, necessary to provide ATC Services safely. |
Last Update: August 9, 2022