User manual

Code: ENIGMA III User Manual
Edition: 1 Revision: 4
Date: 19/12/2008
Page: 22/97
The figure below shows the digital clutter filter structure for the time domain filtering. The coefficients
determine the filter characteristics. Seven different high pass filter are selectable. Please refer to the
chapter Pulse Pair processing, DFT processing and FFT processing for further details.
A'
n
= B
0
A
n
+ B
1
A
n-1
+ B
2
A
n-2
+ B
3
A
n-3
+ B
4
A
n-4
– C
1
A'
n-1
– C
2
A'
n-2
– C
3
A'
n-3
– C
4
A'
n-4
A
n
are the unfiltered samples, A'
n
are the filtered samples, B
0
-B
4
and C
1
-C
4
are the coefficients of the IIR filter
Parameter: ClutterFilter, MaxFilterRange, ZeroFilter and FilterDelay
GAMIC Proprietary
Illustration 16: IIR time domain clutter filter
Illustration 14: 40 dB IIR clutter filter
Illustration 15: 50 dB IIR clutter filter