Ads-B Traffic; Ads-B System Overview - Garmin G1000 NXi Pilot's Manual

6.6 ADS-B TRAFFIC

WARNING: Do not rely solely upon the display of traffic information for collision avoidance maneuvering.
The traffic display does not provide collision avoidance resolution advisories and does not under any
circumstances or conditions relieve the pilot's responsibility to see and avoid other aircraft.
WARNING: Do not rely solely upon the display of traffic information to accurately depict all of the traffic
information within range of the aircraft. Due to lack of equipment, poor signal reception, and/or inaccurate
information from other aircraft, traffic may be present but not represented on the display.

ADS-B SYSTEM OVERVIEW

Automatic Dependent Surveillance-Broadcast (ADS-B) is a core technology in the FAA NextGen air traffic
control system. It offers improved surveillance services, both air-to-air and air-to-ground, especially in areas
where radar coverage is ineffective due to terrain, or where it is impractical or cost prohibitive. ADS-B is
comprised of three segments for the purposes of providing traffic information: ADS-B (Broadcast), ADS-R
(Rebroadcast), and Traffic Information Service-Broadcast (TIS-B).
ADS-B includes the automatic broadcast of position reports by aircraft, surface vehicles, and transmitters on
fixed objects. These broadcasts contain information such as GPS position, identity (Flight ID, Call Sign, Tail
Number, ICAO registration number, etc.), ground track, ground speed, pressure altitude, and emergency status.
For the purpose of distinguishing between levels of ADS-B service, there are three classifications of aircraft or
system capability: ADS-B In, ADS-B Out, and ADS-B participating. ADS-B In refers to the capability to receive
ADS-B information. ADS-B Out refers to the capability to transmit ADS-B information. ADS-B participating
refers to the capability to both send and receive ADS-B information. Aircraft lacking either ADS-In, ADS-B Out,
or both ADS-B capabilities may also be referred to as ADS-B nonparticipating aircraft.
The ADS-B system operates on two frequencies: 1090 MHz and 978 MHz. Both frequencies provide the same
traffic information. An aircraft may be ADS-B In, Out, or participating on one or both frequencies, depending
on the installed equipment. The 1090 MHz frequency portion of ADS-B is known as 1090 Extended Squitter
(1090 ES). The 978 MHz portion of ADS-B is known as Universal Access Transceiver (UAT).
190-02177-02 Rev. A
GPS
18,000 FT
10,000 FT
Mode A/C
UAT
ATC
RADAR
Figure 6-82 ADS-B System
Garmin G1000 NXi Pilot's Guide for the Cessna NAV III
1090 ES
UAT
RADAR
Composite
1090 ES
UAT
1090 ES
ADS-B Ground Station (ADS-R,
TIS-B, FIS-B)
HAZARD AVOIDANCE
UAT
349