Control personnel in their duties. Though CATCC/AATCC DAIR normally uses the
AN/SPN-43 and associated IFF for controlling air traffic, the Field Change 3 system also
uses the AN/SPS-49 RADAR and IFF to create targets by fusing the RADAR and IFF
inputs from the AN/SPN-43 and the AN/SPS-49 systems creating the secondary
targets. The fusing of targets is performed in the RADAR Data Processor (RDP).
Selecting which primary RADAR video to display on the console is controlled at the OD-
220/TPX-42A(V) consoles and the RADAR via the switchboard. Additionally, the
AN/TPX-42A(V) automatically tracks Mode 1, 2, 3/A, and C equipped aircraft and
provides the air traffic controller with an alphanumeric display of aircraft identity,
altitude, and other amplifying data which is superimposed over the appropriate RADAR
This system is also capable of processing and displaying flight plans, geographic
reference points, and map lines for easy association with mission operations.