ADS-B/ADS-C Flashcards
What does ADS-B stand for?
Automatic Dependant Surveillance - Broadcast
- It’s Automatic because no external interrogation is needed. It works in the background
- It’s Dependant because it relies on onboard position sources (GNSS) and transmission systems to provide information to ATC
What identification nr is used by ATC for ADS-B?
The “CPA” number
When does ADS-B become operational?
When the transponder is set to ON/AUTO
How does ADS-B work?
Aircraft receives GNSS signal to get it’s position.
Then the aircraft simultaneously broadcasts the position and other information to other aircraft and ground stations. These ground stations relays the information to ATC
What is the difference between ADS-B Out and ADS-B in?
- ADS-B Out is a surveillance technology to track aircrafts. Aircraft transmits position, speed and altitude once every half second
- ADS-B In is the ability to receive weather and traffic information.
ADS-B Out will be mandatory while ADS-B In is optional
What frequency/datalink is ADS-B using?
1090 Mhz
What is the difference between 1090 ES and 978 UAT?
1090 ES Out is used by airlines and over 18’000 ft (USA)
978 UAT Out is used by small planes below 18’000 ft. You still need a transponder for airlines to see you on TCAS
1090 ES In receives traffic only
978 UAT In receives traffic and weather
What is the range of an ADS-B transmitter?
240 nm
What is ADS-C?
ADS-C is a method of surveillance that relies on (is dependent on) downlink reports from an aircraft's avionics that occur automatically in accordance with contracts established between the ATC ground system and the aircraft's avionics. Contracts can be: 1. Periodic 2. Event 3. Demand 4. Emergency (Aircraft controlled only)
What is the difference between ADS-C and CPDLC?
ADS-C is for surveillance
CPDLC is for communication
