staggered pulse repetition time clutter filter (‘sachi’) performance
DESCRIPTION
Staggered Pulse Repetition Time Clutter Filter (‘SACHI’) Performance. Data Quality Technical Interchange Meeting November 19-20, 2008. David Warde and Sebasti á n Torres, CIMMS, University of Oklahoma NSSL/OAR/NOAA, Norman, Oklahoma. Outline. TAC Brief - PowerPoint PPT PresentationTRANSCRIPT
DQ TIM Fall 2008DQ TIM Fall 2008 11
Staggered Pulse Repetition TimeStaggered Pulse Repetition TimeClutter Filter (‘SACHI’) PerformanceClutter Filter (‘SACHI’) PerformanceStaggered Pulse Repetition TimeStaggered Pulse Repetition Time
Clutter Filter (‘SACHI’) PerformanceClutter Filter (‘SACHI’) Performance
Data QualityData Quality
Technical Interchange MeetingTechnical Interchange Meeting
November 19-20, 2008November 19-20, 2008
Data QualityData Quality
Technical Interchange MeetingTechnical Interchange Meeting
November 19-20, 2008November 19-20, 2008
David Warde and SebastiDavid Warde and Sebastiáán Torres, n Torres, CIMMS, University of OklahomaCIMMS, University of Oklahoma
NSSL/OAR/NOAA, Norman, OklahomaNSSL/OAR/NOAA, Norman, Oklahoma
David Warde and SebastiDavid Warde and Sebastiáán Torres, n Torres, CIMMS, University of OklahomaCIMMS, University of Oklahoma
NSSL/OAR/NOAA, Norman, OklahomaNSSL/OAR/NOAA, Norman, Oklahoma
DQ TIM Fall 2008DQ TIM Fall 2008 22
OutlineOutline
TAC BriefTAC Brief
Interlaced with some things I didn’t show Interlaced with some things I didn’t show at the TACat the TAC
DQ TIM Fall 2008DQ TIM Fall 2008 33
HistoryHistory
SACHI FilterSACHI Filter– NSSL Report 3, 1999NSSL Report 3, 1999
Described AlgorithmDescribed AlgorithmProvided Preliminary Filter PerformanceProvided Preliminary Filter Performance
– NSSL Report 9, 2005NSSL Report 9, 2005Provided Algorithm DescriptionProvided Algorithm DescriptionUsed TableUsed Table
– NCAR Report, 2007NCAR Report, 2007Analyzed Filter Performance – Fixed NotchAnalyzed Filter Performance – Fixed Notch
– NSSL Report 11, 2007NSSL Report 11, 2007Improved Algorithm DescriptionImproved Algorithm DescriptionAdaptable Notch Based on GMAPAdaptable Notch Based on GMAP
– NSSL Report 12 (Pending Release)NSSL Report 12 (Pending Release)Performance EvaluationPerformance Evaluation
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Clutter Filtering System SpecificationsClutter Filtering System Specifications
System Specification (SS) Performance System Specification (SS) Performance Requirements Anticipate IIR FilterRequirements Anticipate IIR FilterApply to Lowest Two Elevation Cuts of Apply to Lowest Two Elevation Cuts of Scan Strategies 1 (VCP11) and 2 (VCP21)Scan Strategies 1 (VCP11) and 2 (VCP21)Testing Set-upTesting Set-up– SNR = 20 dBSNR = 20 dB– CSR CSR ≥≥ -30 dB -30 dB– Spectrum Width (Spectrum Width (σσvv)): 4 m/s: 4 m/s– Velocity: Extent of NyquistVelocity: Extent of Nyquist
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Clutter Filtering System SpecificationsClutter Filtering System Specifications(Continued)(Continued)
ReflectivityReflectivity– Clutter Suppression: 30 dB Clutter Suppression: 30 dB – Bias: (measured Bias: (measured @ SNR 20 dB, CSR -30 dB)@ SNR 20 dB, CSR -30 dB)
σσvv (m/s) (m/s)
Maximum Maximum Reflectivity Bias Reflectivity Bias
(dB)(dB)
11 1010
22 22
>=3>=3 11
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‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance
Clutter Suppression for Reflectivity Clutter Suppression for Reflectivity (Goal 30 dB)(Goal 30 dB)
~50 Clutter Suppression ~10 Clutter Suppression
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‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance(Continued)(Continued)
PRT1 PRT1 (μs)(μs)
Va (m/s)Va (m/s) 6161 5353 4848 4343 3939 3636 3333 3131 2727
RaRadd (km) (km) 132132 150150 169169 187187 206206 224224 242242 261261 300300
RaRass (km) (km) 198198 225225 253253 281281 308308 336336 364364 391391 450450
5050 4040 4040 4040 4040 4040 1010 1010 4040
Dwell (ms)Dwell (ms)
5050 5050 4040 3535 4040 4040 4040 3535 1010 4444
5050 5050 5050 3535 3535 3535 4040 3535 1010 4848
5050 5050 5050 5050 3535 3535 3535 3535 3535 5252
5050 5050 5050 5050 5050 3535 3535 3535 3535 5656
5050 5050 5050 5050 5050 3030 3535 3030 6060
5555 5050 5050 5050 5050 5050 3030 3030 3030 6464
5555 5555 5050 5050 5050 5050 5050 3030 3030 6868
5555 5555 5050 5050 5050 4545 5050 5050 2525 7272
5555 5555 5555 5050 5050 5050 5050 5050 2525 7676
5555 5555 5555 5050 5050 5050 5050 5050 5050 8080
5555 5555 5555 5555 5050 5050 5050 4545 5050 8484
5555 5555 5555 5555 5050 5050 5050 5050 5050 8888
5555 5555 5555 5555 5555 5050 4545 5050 4545 9292
5555 5555 5555 5555 5555 5050 5050 5050 4545 9898
5555 5555 5555 5555 5555 5555 5050 5050 5050 100100
882 1002 1125 1248 1371 1494 1617 1740 2000
VCP212
1.8°2.4°3.1°
4.0°
5.1°
6.4°
16.7° 8.0°12.0° 10.0°19.5°
1.3°0.9°0.5°
SZ2
Dwell=
Performance
PRT = Performance
1010
5050
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‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance(Continued)(Continued)
Reflectivity Bias – Surveillance Reflectivity Bias – Surveillance (Non-Operational Test)(Non-Operational Test)
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‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance(Continued)(Continued)
Reflectivity Bias – Doppler Reflectivity Bias – Doppler (Operational Test)(Operational Test)
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‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance(Continued)(Continued)
Reflectivity Bias – Clear Air Reflectivity Bias – Clear Air (Non-Operational Test)(Non-Operational Test)
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Clutter Filtering System SpecificationsClutter Filtering System Specifications(Continued)(Continued)
Velocity and Spectrum Width Velocity and Spectrum Width – Clutter Suppression: 20 to 50 dBClutter Suppression: 20 to 50 dB– Bias and Standard Deviation:Bias and Standard Deviation:
2 m/s for Usable Velocities @ 20 dB SNR2 m/s for Usable Velocities @ 20 dB SNR, -30dB CSR, -30dB CSR, , σσvv of 4 m/s of 4 m/s
Usable Velocities Usable Velocities
(v(vminmin m/s) m/s)
Clutter Suppression SelectionClutter Suppression Selection
(dB)(dB)
2 2020
33 2828
44 5050
Legacy Low
Legacy Medium
Legacy High
-2+2 20
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‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance(Continued)(Continued)
Velocity Bias Velocity Bias – Goal - 2 m/s Bias Goal - 2 m/s Bias
Usable velocities 4 m/s @ 50 dB, 3 m/s @ 28 dB, 2 m/s @ 20 dBUsable velocities 4 m/s @ 50 dB, 3 m/s @ 28 dB, 2 m/s @ 20 dB
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PRT = 1740 usSNR = 20 dBCSR = 40 dBSW = 4 m/s
Velocity DealiasingVelocity Dealiasing
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Velocity Dealiasing (cont)Velocity Dealiasing (cont)PRT = 882 usSNR = 20 dBCSR = 40 dBSW = 4 m/s
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0 Nyquist
What’s Happening?What’s Happening?
Recall SPRT 2:3 Code [1 0 1 0 0]Recall SPRT 2:3 Code [1 0 1 0 0]
2/5 Nyquist4/5 Nyquist
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‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance(Continued)(Continued)
Velocity Bias and Standard Deviation Velocity Bias and Standard Deviation
S
C
D
PRT = 2000 μsDwell = 54 ms
PRT = 1002 μsDwell = 64 ms
PRT = 1494 μsDwell = 82 ms
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PRT1 PRT1 (μs)(μs) 882882 10021002 11251125 12481248 13711371 14941494 16171617 17401740 20002000
Va (m/s)Va (m/s) 6161 5353 4848 4343 3939 3636 3333 3131 2727
RaRadd (km) (km) 132132 150150 169169 187187 206206 224224 242242 261261 300300
RaRass (km) (km) 198198 225225 253253 281281 308308 336336 364364 391391 450450
4040 1010 2525 00 00 00 -30-30 -30-30 -30-30 4040
Dwell (ms)Dwell (ms)
4040 3030 2525 2525 -30-30 -30-30 -30-30 -30-30 -30-30 4444
4040 4040 3030 2525 1515 -30-30 -30-30 -30-30 -30-30 4848
4040 3030 3535 1010 2020 -30-30 -30-30 -30-30 -30-30 5252
4040 4040 4040 1515 2020 1010 -30-30 -30-30 -30-30 5656
4545 4040 3030 4040 1515 1515 -30-30 -30-30 -30-30 6060
4545 4040 2525 3535 1010 -30-30 -30-30 -30-30 6464
4545 4545 4040 2020 3535 2525 1010 -30-30 -30-30 6868
4545 4545 4040 3535 2020 1010 1515 00 55 7272
4545 4545 4040 4040 3030 2020 1010 -30-30 -30-30 7676
4545 4545 4545 4040 3535 2020 1515 1515 -30-30 8080
5050 4545 4545 4040 4040 2020 1010 55 -30-30 8484
5050 5050 4545 4545 4040 3030 1515 1515 -30-30 8888
5050 5050 4545 4040 4040 3535 2525 55 -30-30 9292
5050 5050 5050 4040 4545 3030 1515 2525 55 9898
5050 5050 5050 4040 4040 3030 3535 1515 00 100100
‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance(Continued)(Continued)
RPG VDAMay Allow
Longer PRTsAnd/Or
Shorter Dwell Times
RPG VDAMay Allow
Longer PRTsAnd/Or
Shorter Dwell Times
4040
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‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance(Continued)(Continued)
Spectrum Width Bias and Standard Spectrum Width Bias and Standard Deviation – Deviation – Goal - 2 m/sGoal - 2 m/s
T1 1740 μs, Dwell 40 msT1 882 μs, Dwell 60 ms
DQ TIM Fall 2008DQ TIM Fall 2008 1919
‘‘SACHI’ Filter PerformanceSACHI’ Filter Performance(Continued)(Continued)
PRT1 PRT1 (μs)(μs) 882882 10021002 11251125 12481248 13711371 14941494 16171617 17401740 20002000
Va (m/s)Va (m/s) 6161 5353 4848 4343 3939 3636 3333 3131 2727
RaRadd (km) (km) 132132 150150 169169 187187 206206 224224 242242 261261 300300
RaRass (km) (km) 198198 225225 253253 281281 308308 336336 364364 391391 450450
4040 3535 3030 3535 3535 3535 3535 3030 2525 4040
Dwell (ms)Dwell (ms)
4040 4040 3535 3030 3030 3535 3535 5050 2525 4444
4545 4545 4545 3030 3030 3535 3535 5050 2525 4848
4545 4545 4545 4545 3030 3535 5050 5050 5050 5252
4545 4545 4545 4545 4545 5050 5050 5050 5050 5656
4545 4545 4545 4545 4545 5050 5050 5050 4545 6060
5050 4545 4545 5050 4545 5050 5050 4545 4545 6464
5050 5050 4545 5050 4545 5050 5050 4545 4545 6868
5050 5050 5050 5050 5050 5050 5050 5050 4040 7272
5050 5050 5050 5050 5050 5050 5050 5050 4040 7676
5050 5050 5050 5050 5050 5050 5050 5050 5050 8080
5050 5050 5050 5050 5050 5050 5050 5050 5050 8484
5050 5050 5050 5050 5050 5050 5050 5050 5050 8888
5050 5050 5050 5050 5050 5050 5050 5050 5050 9292
5050 5050 5050 5050 5050 5050 5050 5050 5050 9898
5050 5050 5050 5050 5050 5050 5050 5050 5050 100100
DQ TIM Fall 2008DQ TIM Fall 2008 2020
SummarySummary
Performance of ‘SACHI’ filter comparable with Performance of ‘SACHI’ filter comparable with GMAP filter in WSR-88DGMAP filter in WSR-88D– Clutter Suppression 30 to 50 dBClutter Suppression 30 to 50 dB– WSR-88D System Specification met for Reflectivity, WSR-88D System Specification met for Reflectivity,
Velocity, Spectrum WidthVelocity, Spectrum WidthDepending PRT/Dwell Time SelectionDepending PRT/Dwell Time SelectionVelocity main constraintVelocity main constraint
– Velocity dealiasing at RPG (va/2)Velocity dealiasing at RPG (va/2)
Ready for Phase IIIReady for Phase III– ROC implementation into WSR-88DROC implementation into WSR-88D– ROC Data Quality AssessmentROC Data Quality Assessment
DQ TIM Fall 2008DQ TIM Fall 2008 2121
Questions?