If two targets respond within the same tracking gate at the same time, what phenomenon is likely?

• A. Track crossing ambiguity
• B. Echo suppression
• C. Target Swop
• D. Track loss

Answer: (C)

When two targets fall inside the same tracking gate at the same moment, the data association becomes ambiguous: the tracker isn’t sure which measurement belongs to which target. If the association labels get swapped from one update to the next, the tracker appears to switch the identities of the two targets, effectively swapping their tracks. This is why the phenomenon is called a target swap. Echo suppression and track loss are about reducing false echoes or losing a track due to missed updates, and track crossing ambiguity is about visual confusion when paths cross, not the identity swap caused by ambiguous within-gate measurements.