Aircraft Telecomm Maintenance Agency 18 Manujendra Dutta Road Kol -28
Contains No . of Pages :
Current Technology
Automatic Dependent Surveillance –
Definition :
Automatic Dependent Surveillance–Broadcast (ADS–B) is an advanced surveillance technology
that combines an aircraft's positioning source, aircraft avionics, and a ground infrastructure to
create an accurate surveillance interface between aircraft and ATC.
Types of it :
Automatic Dependent Surveillance–Broadcast (ADS–B) is an advanced surveillance technology that
combines an aircraft’s positioning source, aircraft avionics, and a ground infrastructure to create an accurate
surveillance interface between aircraft and ATC. ADS–B is a performance–based surveillance technology
that is more precise than radar and consists of two different services: ADS–B Out and ADS–B In.
We will look into the ADS B out function :
ADS-B Out works by broadcasting information about an aircraft's GPS location, altitude, ground speed and
other data to ground stations and other aircraft, once per second. ADS-B Out airspace and equipment
requirements are contained in 14 CFR § 91.225 and the equipment performance requirements are
contained in §91.227. ADS-B In provides operators of properly equipped aircraft with weather and traffic
position information delivered directly to the cockpit.
ADS-B Out is an evolutionary step in communication between the aircraft and other airspace consumers.
Current transponders enable ATC and other aircraft to know your aircraft's relative position and altitude.
ADS-B adds important information to help project and prevent traffic conflicts by estimating intent,"
explained Jake Biggs, Textron Aviation's aftermarket engineering manager.
ADS-B advantages
Increase capacity and efficiency of airspace
Expand ATC surveillance into more areas
ADS-B Out
ADS B IN not used right now as a mandate .
Broadcasts identification, position, altitude and velocity to other aircraft and ATC.
ADS-B In ( Not being Manadated Now)
For some aircraft, it receives broadcasted information, including aircraft positioning, weather data and pilot
reports.
"ADS-B requires extremely accurate, three-dimensional position reporting to reduce reliance on ground-
based radar to allow tighter separation standards. The advantage to all airspace users is an extremely
accurate understanding of traffic and where it is going.
ADS-B Out Required for Some Indian Routes
WHAT EQUIPMENT IS NEEDED FOR COMPLIANCE?
Airspace where a transponder is now required will need to be equipped or upgraded with at least two avionics components: a high-
integrity (WAAS-enabled) GPS navigation source and an ADS-B datalink product.
For aircraft flying at or above 18,000’ . or anywhere internationally, you will be required to use the 1090 MHz frequency using a
Mode S Extended Squitter transponder.
For aircraft flying below 18,000’ and only in the U.S., you can opt for a dedicated 978 MHz universal access transceiver (UAT). The
978 MHz frequency will allow you to keep an existing Mode C or Mode S transponder that you may already have. Installing a 978
MHz UAT with ADS-B “In” technology allows you to view Traffic Information Service-Broadcast and Flight Information Service-
Broadcast information on a compatible flight display.
The following model of Transponders are expected to be used
1.TM 250 /GTX 335/345
ADS-B Out works by broadcasting information about an aircraft's GPS location, altitude, ground speed and other data to
ground stations and other aircraft, once per second.
Can also be done
tailBeacon works with any existing Mode C Transponder. uAvionix’s patented power transcoder technology
seamlessly communicates with your existing legacy transponder over your aircraft’s electrical system.
