User manual

Code: ENIGMA III User Manual
Edition: 1 Revision: 4
Date: 19/12/2008
Page: 58/97
6.9.1 RangeStep
Specify the range step as floating point value in km. The range step must be a multiple of the base
resultion (25 m). Range stepping specifies the bin spacing for range sampling (see: RangeSample)
Type: float
Default: 0.125
Unit: km
6.10 Range Sampling
The algorithm uses 'Range', 'RangeStep' and 'RangeSample' parameters to average autocorrelations by
range. This reduces the number of bins in the final data, improves the signal noise ratio and saves
network traffic. During this step ClutterMicroSuppression is performed.
6.10.1 RangeSample
Specify the number of bins to be averaged (1-40). Example: If you specify a range step of 0.25km and
range sample of 4 the final bin spacing will be 1km.
Type: integer
Default: 8
NumBins = Range / (RangeStep*RangeSample)
Example:
● Range 100km
● RangeStep 50m
● RangeSample 10
The resulting bins have a resolution of 500m. The ray will contain 200 bins
6.10.2 Clutter Micro Suppression
Clutter micro suppression excludes bins from the range sampling step if the contained clutter power
exceedes a configurable threshold (ClutterMicroSuppressionThreshold). The clutter power is estimated
from the T
0
/ R
0
ratio. Clutter micro suppression improves subclutter visibility when using the range
sampling algorithm. Recommended values for the threshold are 30-40dB.
Type: float
Default: 0.0
Unit: dB
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