In ARPA, what does TCPA denote?

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Multiple Choice

In ARPA, what does TCPA denote?

TCPA is the time remaining until the two ships reach the closest point of approach along their current tracks. It comes from the relative motion of the ships: by comparing how the target is moving relative to you, you can determine when their separation will be smallest if both continue on their present speeds and headings. A positive TCPA means the closest point lies in the future, a negative TCPA means that closest point has already passed, and a TCPA of zero means you are currently at the closest point. This timing is paired with CPA—the distance at that closest point—to assess collision risk. The other phrases aren’t the standard ARPA term. Time to Collision isn’t the defined metric in this context, the wording Time to Reach the Closest Point is vague, and a windowed constraint adds an arbitrary limit. So the correct interpretation is Time to Closest Point of Approach.

TCPA is the time remaining until the two ships reach the closest point of approach along their current tracks. It comes from the relative motion of the ships: by comparing how the target is moving relative to you, you can determine when their separation will be smallest if both continue on their present speeds and headings.

A positive TCPA means the closest point lies in the future, a negative TCPA means that closest point has already passed, and a TCPA of zero means you are currently at the closest point. This timing is paired with CPA—the distance at that closest point—to assess collision risk.

The other phrases aren’t the standard ARPA term. Time to Collision isn’t the defined metric in this context, the wording Time to Reach the Closest Point is vague, and a windowed constraint adds an arbitrary limit. So the correct interpretation is Time to Closest Point of Approach.

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