ADS & MLAT Flashcards
What does ADS-B stand for?
Automatic Dependant Surveillance Broadcast
Describe ADS-B
A means by which aircraft, vehicles and other objects can automatically transmit/receive data such as ident,
position, and any additional data in a broadcast mode via a data link.
Automatic - Requires no external stimulus
Dependant - Relies on on-board systems
Surveillance - Gives information to other parties
Broadcast
What does ADS-B broadcast?
Horizontal Position
Vertical Position
Velocity
Other Information
What equipment is needed to facilitate ADS-B out?
1090MHz Extended Squitter
GPS Navigation
Mode S Transponder
Capable Avionics
Connections between all of the above
Is ADS-B big and expensive or small and cheap?
Relatively Inexpensive
Small footprint and power requirement
What are the three primary types of regular ADS-B Broadcast?
Position (Surface & Airborne)
Airborne Velocity
Aircraft Identity
What is ADS-C?
Automatic Dependant Surveillance Contract
Describe ADS-C
Automatic Dependant Surveillance Contract
The ground system provides the aircraft with a list of reports to send and specifies when to send them.
Relies on establishing a contract between the ground system and the aircrafts avionics via datalink.
What are the types of ADS-C?
Periodic Contract
Demand Contract
Event Contract
Describe Space Based ADS-B
ADS-B can be picked up by satellites, providing coverage in remote locations such as the Ocean.
What does MLAT stand for?
Multilateration
Describe MLAT
Several MLAT sites receive broadcasts from Mode S, and the system uses a process called Time Difference of Arrival (TDOA) to calculate the position and display to the ATCO.
