When ambiguous contacts are close together, how should they be resolved?

• A. Cross-check with prior data and assign separate tracks based on distinct motion patterns.
• B. Always merge near contacts into a single track to avoid clutter.
• C. Ignore any contact within a gate unless a long-term persistence is observed.
• D. Increase the radar gain to resolve conflicts between close contacts.

Answer: (A)

When contacts are very close, you rely on data association informed by what you already know from prior scans. The idea is to compare the new measurements with the predicted positions and motion histories of the existing tracks. If the two nearby returns fit two distinct motion patterns—different speeds, directions, or turn rates that match two separate targets—you keep two separate tracks and assign each contact to the appropriate track. This preserves the identity of each target and prevents clutter or misidentification that would come from merging.

Merging near contacts is risky because it can disguise multiple targets as one, while ignoring a contact within a gate would risk missing a real target, and simply cranking up radar gain doesn’t solve the fundamental ambiguity and can amplify clutter.