In ARPA, what best describes the primary function of the system?

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ARPA’s primary function is to automatically process radar data into target tracks and present them with predictive information. The system uses a numerical processor to initiate, maintain, and update multiple target tracks from radar returns, applying motion models to forecast future positions. It then displays the tracked targets along with related data chosen by the operator—such as range, bearing, speed, course, track history, and collision‑avoidance metrics like CPA and TCPA. This automation reduces manual plotting effort and enhances situational awareness by providing consistent, timely track information even in cluttered or high-traffic situations. It’s not just a manual plotting tool, a weather monitor, or a simple range calculator; those roles do not describe ARPA’s ability to automatically generate and present persistent tracked targets with predictive guidance.