In ARPA tracking, which statement correctly identifies ER and EM vectors?

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Multiple Choice

In ARPA tracking, which statement correctly identifies ER and EM vectors?

In ARPA tracking, the ER vector is the ownship data vector, and the EM vector is the contact’s motion projection. This means ER carries the information about the ownship’s current position and motion used as the reference for relative tracking, while EM represents where the detected contact is expected to move next based on its current velocity (the projected motion). Together, ER anchors the plot to the ownship, and EM provides the predicted path of the contact to help forecast range and bearing changes. This is why the stated correct choice fits: it assigns ER to the ownship data vector and EM to the contact’s motion projection. The other ideas mix up roles or treat ER as a simple range term, which isn’t how these ARPA vectors are defined.

In ARPA tracking, the ER vector is the ownship data vector, and the EM vector is the contact’s motion projection. This means ER carries the information about the ownship’s current position and motion used as the reference for relative tracking, while EM represents where the detected contact is expected to move next based on its current velocity (the projected motion). Together, ER anchors the plot to the ownship, and EM provides the predicted path of the contact to help forecast range and bearing changes.

This is why the stated correct choice fits: it assigns ER to the ownship data vector and EM to the contact’s motion projection. The other ideas mix up roles or treat ER as a simple range term, which isn’t how these ARPA vectors are defined.

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