Enigma video processor Instrukcja Użytkownika Strona 21
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Code: ENIGMA III User Manual
Edition: 1 Revision: 4
Date: 19/12/2008
Page: 21/97
2.4 Doppler clutter filters
Doppler clutter filtering is based on the valid assumption that stationary ground targets appear as strong
narrow peaks around zero in the spectrum (sampled over the PRT).
The doppler clutter filter (both time- and frequency- domain processing) attenuate the radar signal around
the zero frequencies. Time domain processing applies a configurable highpass filter to the radar data. This
attenuates all DC components in the signal, regardless if they are due to clutter or weather. The frequency
domain filter work on the above mentioned assumption and are able to separate weather and clutter
targets.
2.4.1 Time domain filtering
The pulse-pair processing performs as a first stage filtering of the input data. It has an implementation of
the digital infinite impulse response (IIR) filters. There are seven 40 dB and seven 50 dB 4-order
Chebyshev highpass filters. The coefficients can be chosen with the parameter 'ClutterFilter'.
0 and 8 – no filtering;
from 1 to 7 – one of 40 dB filter;
from 9 to 15 – one of 50 dB filter.
Additional parameter are ZeroFilter and FilterDelay. When using PRF staggering it is recommended to
use the ZeroFilter and FilterDelay parameter as consecutive rays are sampled with a different sampling
frequency (PRF). The recursive filters must be reset to avoid artifacts.
GAMIC Proprietary
Illustration 13: Typical spectrum showing weather and clutter targets
- ENIGMA III 1
- User Manual 1
- Table of Contents 2
- Illustration Index 7
- – Minor text revisions 8
- 1 Introduction 9
- 2 Algorithms 10
- 2.1.1 Noise Power threshold 11
- 2.1.2 CCOR threshold 11
- 2.1.3 SQI threshold 11
- 2.1.4 RHOHV Threshold 11
- 2.1.5 PhiDP SNR Threshold 11
- 2.1.6.2.2 IQ clutter filter 12
- 2.1.6.2.1 CCOR Threshold: 12
- 2.3 Averaging 20
- 2.3.1 Time averaging 20
- 2.3.2 Range averaging 20
- 2.4 Doppler clutter filters 21
- 2.4.1 Time domain filtering 21
- 2.4.2.1 DC Cancelation 23
- 2.4.2.3 Interpolation 23
- 2.4.2.1 Windowing 24
- 2.5 Pulse-pair processing 26
- 2.6 DFT processing 27
- 2.7 FFT processing 28
- 2.8 Range-Doppler Dilemma 29
- 2.9 Calibration 30
- 2.10 Dynamic Angle Syncing 31
- 2.11 Dual PRF Unfolding 32
- 3 Network 35
- 4 SDP settings 35
- 5 SDP interfaces 35
- 5.1 Command interface 36
- 5.1.1 Connection 37
- 6 Parametrization 38
- PhidpSNR: Phidp SNR threshold 39
- 6.1.1 KlystronGateDurationX 41
- 6.1.2 KlystronGateStartX 41
- 6.1.3 KlystronPulseDurationX 41
- 6.1.4 KlystronTaperingStartX 42
- 6.1.5 KlystronTaperingStopX 42
- 6.1.7 KlystronWindowTypeStopX 42
- 6.2 Trigger 43
- 6.2.1 TrigXEnable 43
- 6.2.2 TrigXDuration 43
- 6.2.3 TrigXStart 43
- 6.2.4 TrigXInvert 44
- 6.3 Sector blanking 44
- 6.3.1 SectorblankingTable 44
- 6.3.2 SectorblankingEnabled 45
- 6.4 Serial TAGS 45
- 6.4.1 PCIRecTagBaudRate 45
- 6.4.2 IFDTagBaudRate 46
- 6.4.3 TagConfiguration 46
- 6.4.4 SerialTagFormat 46
- Data packet Format 0 46
- Data packet Format 1 48
- 6.5 Extended Dynamic Range 49
- 6.5.1 ExtendedDynamicRange 49
- 6.5.2 PowerThreshold 49
- 6.5.3 PowerDiffH/PowerDiffV 50
- 6.5.4 PhaseDiffH/PhaseDiffV 50
- 6.6 IF signal processing 51
- 6.6.2 IFD matched filter 52
- FIRCoeff0 – FIRCoeff3 54
- 6.6.5 Burst sampling 55
- Code: ENIGMA III User Manual 56
- Edition: 1 Revision: 4 56
- Date: 19/12/2008 56
- Page: 56/97 56
- GAMIC Proprietary 56
- 6.7 Video signal processing 57
- 6.8 Autocorrelations 57
- 6.8.1 AcfMode 57
- 6.9 Range 57
- 6.9.1 RangeStep 58
- 6.10 Range Sampling 58
- 6.10.1 RangeSample 58
- 6.11 ClutterFilter 59
- 6.11.1 InterpolationMode 59
- 6.11.2 FFTWindow 59
- 6.11.3 ZeroFilter 60
- 6.11.4 FilterDelay 60
- 6.11.5 MaxFilterRange 60
- 6.12.1 IOffsetH 61
- 6.13 PRFTable 62
- 6.13.1 PrfLimits 62
- 6.14 PulseWidthIndex 62
- 6.15 NOISEThreshold 62
- 6.15.1 noisePowerH 63
- 6.15.2 noisePowerV 63
- 6.16 dbz0 63
- 6.17 RangeNorm 63
- 6.18 gasAttenuation 64
- 6.19 CCORThreshold 64
- 6.20 SQIThreshold 64
- 6.21.1 RainAttenuation 64
- 6.21.2 RainAttenuation_a 65
- 6.21.3 RainAttenuation_b 65
- 6.21.4 RainAttenuation_A 65
- 6.21.5 RainAttenuation_B 65
- 6.22 Threshold algorithms 66
- 7 Acquisition 67
- 7.2 Reflectivity 68
- 7.4 CCOR clutter correction 68
- 7.5 Radial Velocity 68
- 7.6 Acquisition parameter 69
- 7.6.1 RaySize 69
- 7.6.2 LongRaySize 69
- 7.6.3 SyncModeParam 69
- 7.7 AFCSettings 70
- 7.8 DualPolMode 70
- 7.9.1 ZdrOffset 71
- 7.9.2 LdrOffset 71
- 7.9.3 PhidpOffset 71
- 7.9.4 RHOHVThreshold 71
- 7.10 DataFormat 71
- 7.11 Ray format 72
- 7.11.1 Ray header format 74
- 7.11.1.1 SDPFlags 75
- 7.11.1.2 SDPStatus 75
- 7.11.2 Angle Data 76
- 7.11.3 Moments 76
- 7.11.4 Mag,I,Q 8 bit 76
- 7.11.5 I,Q 16 bit 77
- 7.11.6 SQI/CCOR 8 bit 77
- 7.11.7 Power spectrum 78
- 7.11.9 Moments 16 bit 78
- 7.11.10 Full Moments 16 bit 79
- - Offset of horizontal I 82
- - Offset of vertical I 82
- 8.2.2 getantennaspeed 83
- 8.2.3 gettemperature 83
- 8.2.4 getpower 83
- 8.2.5 getconverter 84
- 8.2.6 getacqperformance 84
- 8.2.7 getafcstatus 84
- 8.3 getversion 85
- 8.4 sampleburst 85
- 8.5 setafcmode 85
- 8.6 getifsampling 85
- 8.7 settxdtrigger 86
- 8.8 geterrorconditions 86
- 8.9 build 86
- 8.10 load 86
- 8.11 save 87
- 8.12 quit 87
- 9 Specifications 88
- Page: 89/97 89
- 9.2.7 Input TAGS serial RS422 90
- 9.3.2 ENIGMA III Host 92
- 10.1 Enigma III host update 95
- 10.2 PCI-Receiver card update 95
- 10.3 Antenna alignment 96
- 10.4 Setting prf limits 96
- 10.5 IQ Recording 97
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