Enigma video processor Manuel d'utilisateur Page 1

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 1/97ENIGMA III User Manual GAMIC Proprietary

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 10/972 Algorithms2.1 ThresholdingAs the radar signal is contaminated with nois

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 11/972.1.1 Noise Power thresholdThe Noise Power threshold [dB] is related to t

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 12/972.1.6 Adjusting reflectivity thresholdsUncorrected reflectivity data (UZ

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 13/97When using the frequency domain filtering (FFT and DFT m

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 14/972.1.6.3 Clutter filtering examplesConsider the following example. T

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 15/97In the above shown examples the clutter has been removed by time domain f

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 16/97The ENIGMA III signal processor has the capability to output CCOR as mome

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 17/972.1.7 Adjusting velocity thresholdsOpen an A-Scope or a PPI for radial ve

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 18/97● Select SQI for V threshold flags.● Select IQ clutter All pass.● Click o

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 19/972.1.8 Adjusting spectral width thresholdsThe thresholding of spectral wid

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 2/97Table of Contents1 Introduction...

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 20/972.3 AveragingThe SDP configuration parameter include the range sample and

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 21/972.4 Doppler clutter filtersDoppler clutter filtering is based on the vali

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 22/97The figure below shows the digital clutter filter structure for the time

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 23/972.4.2 Frequency domain filteringFor frequency domain filtering several di

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 24/972.4.2.1 WindowingTo suppress sidelobes it is necessary to apply a taperin

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 25/97Terminology:• N represents the width, in samples, of a discrete-time wind

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 26/972.5 Pulse-pair processing.The basis for time domain moment estimation is

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 27/972.6 DFT processing.The Doppler power spectrum may be estimated from the

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 28/972.7 FFT processing.The above described DFT (Discrete Fourier

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 29/972.8 Range-Doppler DilemmaThe physical relationship between the unambiguou

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 3/976.1.5 KlystronTaperingStopX...

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 30/972.9 CalibrationCalibrated reflectivity data [dBZ] are calculated from the

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 31/972.10 Dynamic Angle SyncingDynamic angle syncing mode is used for data acq

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 32/972.11 Dual PRF UnfoldingIn order to increase the mean velocity dynamic ran

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 33/97Parameter: PrfLimits and PrfTabGAMIC ProprietaryIllustration 26: Dual PRF

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 34/972.12 Default values for the extended SDP parameterDefault values for the

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 35/973 NetworkNetwork is configured in the file /etc/conf.d/net. The file look

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 36/975.1 Command interfaceSDP is controlled by text commands via network sessi

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 37/975.1.1 Connection5.1.1.1 Browser interfaceMost of the parameters described

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 38/976 ParametrizationThere are many commands and parameters supported by the

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 39/97DataFormat: Frog output data format typeDualPolMode: dual polarization mo

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 4/976.11.4 FilterDelay...

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 40/97SpeckleRemoverZ: Reflectivity speckle removerSyncModeParam: Sync modeTagC

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 41/97if failed6.1 Klystron related parameterThe following parameter can be con

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 42/976.1.4 KlystronTaperingStartXTapering percentage for the start of the burs

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 43/97matching the burst exactly in time and 25% of linear tapering at both sid

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 44/976.2.4 TrigXInvertInvert the trigger (When this trigger is disabled the ou

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 45/97Example:Configure sector blanking for a sector 10°-16° azimuth for elevat

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 46/97Remark: Only the baud rate is configurable. The other serial parameter ar

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 47/97The last Byte consists of a checksum calculated from Byte 0 to byte 5 (CS

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 48/97D7 D6 D5 D4 D3 D2 D1 D00 CSUM6 CSUM5 CSUM4 CSUM3 CSUM2 CSUM1 CSUM0Data pa

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 49/97Byte 4D7 D6 D5 D4 D3 D2 D1 D00 EL8 EL7 EL6 EL5 EL4 EL3 EL2Byte 5D7 D6 D5

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 5/977.9.1 ZdrOffset...

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 50/97Default: 70Unit: percent6.5.3 PowerDiffH/PowerDiffVSet the power differen

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 51/97Here ENIGMA measured a power difference of 20.3 dB. The next step is to s

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 52/976.6.2 IFD matched filterThe batched filter for the IFD is a complex bandp

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 53/97performs undersampling of the IF signal. Please refer to

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 54/972. This multiple of the decimation factor must be in the range [1...20]3.

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 55/97attenuation - Stopband attenuation in dB for Remez algorithm (used by Fro

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 56/97GAMIC Proprietary

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 57/976.7 Video signal processingTime series consist of an array of complex num

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 58/976.9.1 RangeStepSpecify the range step as floating point value in km. The

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 59/976.11 ClutterFilterSpecify the clutter filter number. This value is used f

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 6/979.2 Electrical specification...

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 60/976.11.3 ZeroFilterClear IIR filter for every rayType: booleanDefault: fa

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 61/976.12 Measured offsets6.12.1 IOffsetHInphase noise sampling average on hor

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 62/97Type: floatDefault: 0.0Remark: The offsets are only used for lowpass re

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 63/97Unit: dB6.15.1 noisePowerHNoise power on horizontal channel as measured b

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 64/976.18 gasAttenuationGaseous attenuation constant. a*r is the gaseous atten

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 65/97Default: false6.21.2 RainAttenuation_aParameter 'a' of the rai

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 66/976.22 Threshold algorithms.Enigma III generates the following moments:● Re

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 67/976.22.1 thresholdFlagsTableFormat of the argument: "word0 word1 ... w

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 68/977.2 Reflectivity.The corrected reflectivity is calculated by the formula:

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 69/97It is normalized to the Nyquist interval [-1;1].Phase unfolding is perfor

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 7/97Illustration IndexIllustration 1: Spectrum showing clutter and weather...

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 70/977.7 AFCSettingsParameters: staloID staloMinTuneRFFreq staloMinTuneUnit st

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 71/977.9.1 ZdrOffsetThe bias in the horizontal/vertical receiver path needs to

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 72/97● 2 - Log,I,Q 8 bit● 3 - I,Q 16 bit● 4 - SQI/CCOR 8 bit● 5 - Power spectr

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 73/97Ray header has the same format for all modes.Then 'N' ray bins

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 74/977.11.1 Ray header format.All values have network byte order.Field Descrip

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 75/977.11.1.1 SDPFlagsWORD 0: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0AM0 AM1 AM

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 76/977.11.2 Angle DataNo bins are sent, only ray header7.11.3 MomentsIn single

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 77/97Moment Mapped range of values Size in bytes ThresholdI [-32767,32768] ADU

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 78/97SQI [0,1] 1 NoCCOR [-90,0] dB 1 NoIn dual polarization mode:Moment Mapped

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 79/97Moment Mapped range of values Size in bytes ThresholdZ [-64;128] dBZ 2 Ye

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 8/97EDITION REVISION DATE Modification Object1 0 22/11/2007 First Edition by m

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 80/97SQI [0,1] 2 NoCCOR [-90,0] dB 2 NoSNR [0,250] dB 2 NoIn dual polarizatio

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 81/97V [-1;1] 2 YesU [-64;128] dBZ 2 YesW [0;1] 2 YesLDR [-64;0] dB 2 Yes7.11.

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 82/978 CommandsMost of the commands can only be performed when the data acquis

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 83/978.2.2 getantennaspeedget antenna params. Returns:azspeed azimuth speed,

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 84/978.2.5 getconverterConverter status. Output arguments:BurstOverflow - ADC

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 85/978.3 getversionReturns version numbers of hardware protocol and firmware v

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 86/978.7 settxdtriggerEnable/disable transmitter triggerParameter: 0 – Disable

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 87/978.11 saveSave parameter to configuration file. The configuration files

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 88/979 Specifications9.1 Mechanical specification GAMIC ProprietaryIllustratio

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 89/979.2 Electrical specification9.2.1 Input voltage220-240 Volt AC, 50-60 Hz,

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 9/971 IntroductionHistory of GAMIC SDP Processors1995 GSP01 PC Card for non Do

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 90/979.2.6 Input Elevation TAG parallelConnector Type: 25 SUBD, female, 16 bit

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 91/97Technical specification - Single Polarization9.3.1 ENIGMA III IF DIGITIZE

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 92/979.3.2 ENIGMA III HostNumber of bins 4096Typical base resolution 125mRange

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 93/97FFT and DFT - Adaptive filter width adjustable in 8 steps (Allpass, Filte

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 94/97Status information - Host CPU load, CPU temperature and amount of free me

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 95/9710 Maintenance and firmware update10.1 Enigma III host updateTo upgrade D

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 96/978. Start the Frog/Muran system on the radar computer by calling “/etc/ini

Code: ENIGMA III User ManualEdition: 1 Revision: 4Date: 19/12/2008Page: 97/9710.5 IQ RecordingRecording of the I/Q-data of the PCI-receiver-board in f