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Code: ENIGMA III User Manual
Edition: 1 Revision: 4
Date: 19/12/2008
Page: 28/97
2.7 FFT processing.
The above described DFT (Discrete Fourier Transform)
processing needs a lot of CPU resources. In case the DFT
processing can't manage the acquired data, some optimizations
can be used. DFT works on the number of samples being a
power of 2 faster than on an arbitrary number of samples. This
optimization is called FFT (Fast Fourier Transform)
The data is split into two overlapping groups, both groups
have a 'power of 2' number of samples. Previously described
DFT (now FFT) performed on both groups and then results are
averaged.
If the number of samples is exactly a power of 2, then no
splitting is needed.
Parameter: AcfMode
GAMIC Proprietary
Illustration 20: FFT processing
- 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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