Garmin GDL 88 Weather Radio User Manual


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2-4
GDL 88 ADS-B Transceiver Pilot’s Guide
190-01122-03 Rev. A
2.2 Automatic Dependent Surveillance –
Rebroadcast (ADS-R)
Because it is not requiredthat ADS-B In capable aircraftbe able to receive
ADS-Bdataonboththe1090MHzand978MHzdatalinks,ameanstogetdata
fromonedatalinktotheotherisrequired.ADS-RistherebroadcastofADS-Bdata
byFAAgroundstationsandprovidesthisservicebytakingdatafromonelinkand
rebroadcastingitontheother.Forexample,twoaircraftareintheservicevolume
foragroundstation,andonetransmittingon1090MHzandtheother978MHz,
the ground station will retransmit the data from each aircraft on the other link to
ensure the two aircraft can “hear” each other.
Figure 2-4 ADS-R Operation - FAA Illustration
TheGDL88(D)iscapableofreceivingADS-Btrafcreportsdirectlyona1090
MHzdata link inaddition totrafc reportsand FIS-B weatheruplinks onthe
978MHzdatalink.ThisallowstheGDL88todirectlyreceiveallADS-Bposition
reports from aircraft in the vicinity guaranteeing the most complete traffic picture
is available to the flight crew without relying on being within ground station
coverageandADS-Rtoprovidethiscompletepicture.
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