Background Field
The contrast field is a smoothed version of the DWELL data which is used as a dynamic
threshold for the contrast filter. For this example a minimum coverage criterion of 25 % was
used. The DWELL is 10 minutes. Note that aggressive clutter filtering has removed nearly all
of the clear air echo at 0 velocity.
Note that only the large scale echoes are included in the background field. This is important,
otherwise airborne targets would be removed during the contrast step when this
background velocity is subtracted.
Chapter 5 – Configuring and Scheduling Optional IRIS Products
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