Which is not an element of surveillance radar data?

• A. Radar Data Link
• B. Weather Information
• C. Surveillance Radar Signals
• D. National Airspace System (NAS) Information

Answer: (D)

Surveillance radar data consists of the information produced directly by the radar system and shared with controllers and other processing systems. It includes the radar signals that produce echoes used to determine target position (range and bearing) and the radar data link that carries those processed results to displays or processing subsystems. Weather information can appear in the same operational picture when weather radar feeds are integrated into the workstation, but it originates from separate meteorological sensors and is not part of the radar’s own data stream. National Airspace System information, however, is not produced by the radar; it’s the broader NAS infrastructure data—airspace structure, sector boundaries, facility statuses—that supports air traffic management but isn’t part of the radar’s data output. Therefore, NAS information is not an element of surveillance radar data.