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The purpose of coasting is to enable the software to maintain target tracking across multiple poor detection areas where a single track may be lost or go out of view. Using data from the real track sightings the software attempts to predict the course of a track when the radar loses visibility of the target. In this situation the software will report predicted track sightings until the target has been re-acquired by the radar at which point it will report real sightings again. Coasting is an embedded process in Witness, and can be controlled using the settings in the Tracking Parameters. This allows different coasting settings in different areas, allowing for larger coast allowances in areas where line of sight is poor or detection is sub-optimal.
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In order to use coasting track, Witness has three these primary settings:
Min. Coast Age: this is the age (in sightings) at which point the track will start to coast. Prior to the track reaching this number of sightings the track and will not coast and will be deleted as soon the radar loses visibility of the target.
Max. Coast Age: this is the maximum age of the track (in sightings) at which point the full amount of available coasts will be used from this point onward.
Coasts: the maximum number of coasts to use. This value sets the maximum number of consecutive predictions the software can make if it can't see the target. If this value is reached and the radar still can't see the target then the track will be deleted.
Coast Extended Time (s): This is the length of time that the system can extend the length of the coast.
Understanding the Coast Age
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Coasting tracks can be identified from normal tracks by their bright blue appearance. Coasted are tracks are not shown by default. To enable them use Highlight Coasting Tracks in the user Tracks:
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User Details - see Tracks.
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Once enabled the tracks will display their costing status in real time on the PPI.
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It is possible to specify which exact sightings were coasts by selecting the History icon and opening the Track Details window.
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