In ARPA context, what does CPA denote?

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Multiple Choice

In ARPA context, what does CPA denote?

In ARPA, CPA stands for Closest Point of Approach—the moment two ships would be at their smallest separation if both maintain their current speeds and courses. The value most people refer to with CPA is the distance at that closest point (the DCPA). So the option describing the distance between your own ship and the target at the closest approach matches this concept exactly. The other ideas refer to time to reach that point (TCPA), accuracy of position, or a general collision probability measure, which are not what CPA denotes.

In ARPA, CPA stands for Closest Point of Approach—the moment two ships would be at their smallest separation if both maintain their current speeds and courses. The value most people refer to with CPA is the distance at that closest point (the DCPA). So the option describing the distance between your own ship and the target at the closest approach matches this concept exactly. The other ideas refer to time to reach that point (TCPA), accuracy of position, or a general collision probability measure, which are not what CPA denotes.

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