Page Comparison

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Clutter Slow Decay: The Clutter Slow Decay effects how clutter is removed from the clutter map. It works by adding to the Time Constant (please refer to Tracker) being used in the debris channelclutter map. We use a default Time Constant of 0.995 90% in the debris channelstandard tracking clutter map, so the slow decay is a % increase of the remaining 0.005 10% from the Time Constant. For example: a 50% Slow Decay is equal to 50% of the 0.005 10% that is not used by the debris clutter channel (so it would be 0.00255%). This is then added to the Time Constant when clutter is being removed, causing the removal of clutter to be slower (essentially being removed at a Time Constant of 0.9975 95% compared to the previous 0.99590%). This allows us to hold onto the clutter data for longer, which is useful in . An example of this useful feature can be seen in ClearWay™ during situations where queues are in progress. When the queue drops, we often get false tracks where targets, such as trees, become visible to the radar again. By holding the clutter data for longer, there is more time before the clutter value will drop below the threshold, causing an alarm when the clutter jumps back up, once the queue has cleared.

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This changes the settings on an area by area basis. Up to 8 Clutter Area Parameters per radar Clutter Map may be added. You can also change the order of the Clutter Areas. This is useful if the areas overlap where the system applies the last parameter on the list.

Area: Select one of the Areas from the list located in the Configuration Tree.

Parameters: Select the Clutter Parameter from the Configuration Tree. Please refer toClutter Parameters for more information.

Thresholding

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Threshold Delta: This threshold works in exactly the same way as for normal processing, but it only applies to the debris channel. The threshold output is always levels above, therefore there are the normal area dependent threshold settings in the Debris Default tracking parameters, however we would encourage you to only use this global threshold setting. If you increase this value, you will desensitise the detection, decreasing the value will increase sensitivity and therefore increase the likelihood of nuisance alarms.

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