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For more information regarding the function and process of debris detection please refer to Debris Detection.
Contents
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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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The Clutter Floor recording needs to be as clean as possible |
Clutter Areas
This changes the settings on an area by area basis. Up to 8 Clutter Area Parameters per Clutter Map may be added.
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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Instant Threshold (pwr): Instant threshold allows cells of sufficient signal strength to bypass the SSI (scan to scan integration) process. So any cell with a strength above the Instant Threshold will immediately be made available for plot extraction.
Recursive Average Gain: The gain used when implementing a rolling average of the amplitude values of real cells seen during the SSI process. By default the SSI process does not provide the real signal strength of a target, instead it provides a synthetic value based on the numbers of times its been seen. By using setting the gain value we can receive the rolling average of the real target signal from multiple sightings. The gain controls how much of a new cell's amplitude is added to the rolling average.
Plot Extraction
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Plots are grouped cells of the radar's detection range that have been recorded as containing an object. |
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