What is the expected sequence of pattern for a SART return on radar?

• A. Concentric circles, then arcs, then dots
• B. Dots, then arcs, then circles
• C. 12 dots, then 12 arcs, then 12 concentric circles
• D. Arcs, then dots, then circles

Answer: (C)

A SART return on radar is a distinctive signature that unfolds over successive radar sweeps. When interrogated, the transponder responds in a timed sequence that appears first as twelve separate dots, then as twelve short arcs, and finally as twelve concentric circles around the target. This progression—dots, then arcs, then circles—happens because the radar’s rotating beam captures the SART’s responses in successive sweeps, building from discrete points to partial rings and finally to full rings. Recognizing this three-stage pattern makes it easy to identify a SART quickly in cluttered radar displays. Other patterns don’t reflect the same evolving sequence across multiple sweeps, so they’re not the standard signature.