Definitions of terms to be used in connection with ARPA performance IMO standards
|means the direction in which the bows of a ship are pointing expressed as an angular displacemement from north.
|Targetʼs predicted Motion
|means a prediction of future target motion based on linear extrapolation from its present motion as determined by past measurements of its range and bearing on the radar.
|means the predicted movement of a target relative to own ship.
|means the predicted true motion of a target as a result of own ship`s direction and speed input. The true vector may be either displayed with reference to the water or to the ground.
|means the process of selecting a target or targets and initiang their tracking.
|means the computer process of observing the sequential changes in the position of a target in order to establish its motion.
|means a situation in which the incoming radar data for a tracked target becomes incorrectly associated with another tracked target or a non-tracked radar echo.
|means an arena set up by the observer which should automatically acquire a target when it enters such an area.
|means equally time-space past position of a target, which is being tracked. The history may be relative or true.
|means tracks displayed by the radar echoes of targets in the form of a synthetic afterglow. The trails may be either relative or true. The true trails may be sea or grounded stabilised.