Communications Flashcards
What is CNS
Communications navigation surveillance
What is ATM
Air traffic management
What is voice communication like
Limited number of frequencies
Frequency constraints
Transmission quality varies depending on vhf or Hf
Language issues
What is data link communications like
Less constraints on number of users
Increased flexibility over receivers of data
Potentially slow data transmission
More complicated for busy air spaces with frequent instructions
Used en route
What is VDL - VHF data link
Data communications using VHF
High transmission speed
Line of sight required
What is HFDL - HF digital link
Data communications using HF
Low transmission speed
World wide coverage
What is AMSS
Aeronautical mobile satellite service
Data communications using satellite communication
Decent transmission speed
No polar coverage
Appears to have better speed than VHF
What is ACARS
Arinc (aircraft) communication addressing and reporting system
Limited due to protocol limitation and proprietary networks
Unable to transfer large amounts of data at a reasonable speed
what is ATN
Aeronautical telecommunications network
ICAO recommended standard
High rates of data transfer using common protocols
“Internet of the sky”
Same as ACARS but is controlled by ICAO
What is ATSU
Air traffic services unit
Communications manager
Decided what means of communication to send a message
Formats the message
What are the applications of ACARS and ATN
Maintenance = if anything goes wrong it automatically send a message
OOOI data
Operational predefined messages
Weather requests D-atis
Free text messages
What is OOOI data
O = out= brakes release O = off = take off O = on = landing I = in = brakes on
What is uplink
Data to the aircraft
What is downlink
Data to the ground station
What are the atc applications of CNS and ATM
Pre departure clearance (PDC)
Oceanic clearance (OCL)
Controller pilot data link communications (CPDLC)
Future air navigation (FANS)
Automatic dependent surveillance (ADS)
What does the C stand for in CNS
Communications
Voice communications (UHF / HF / SATCOM)
Data communications (CPDLC)
What does the N stand for in CNS
Navigation
Defined airspace to FANS operational standards
Required navigation performance (RNP) standards
What does the S stand for in CNS
Surveillance
Radar including mode S transponder
Automatic dependent surveillance (ADS)
What is FANS
Future air navigation system
ACARS for communications
What is CPDLC
Controller pilot data link communications
Reduces need for voice communications
Atc instructions
Notification / log on by pilots
What is ADS C
Contract determined by atc
Point to point data link where the frequency of transmission is decided by atc
Periodic = regular intervals
On demand = when requested
On event = when a defined event occurs
What is the only ADC contract that can be activated my the crew
Emergency mode
What is ADS B
Broadcast
Mobile station automatically broadcasts flight data
Ground / mobile stations may receive
Increases surveillance beyond capability of radar
Enables free flight concept
