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CuPIDOCuPIDO Workshop:Workshop:LidarLidar Research at ASUResearch at ASU
Ron CalhounRon Calhoun
April 11, 2005April 11, 2005
Department of Mechanical & Aerospace EngineeringDepartment of Mechanical & Aerospace EngineeringArizona State UniversityArizona State University
Basics of Basics of LidarLidar
Coherent Doppler500 PRF6-10 km radial range60m range gatesFine azimuthal resolution possibleAerosol backscatter and Radial Velocities0.5 m/s velocity accuracy
Urban Dispersion Experiment: Salt Lake City (Oct. 2000)Urban Dispersion Experiment: Salt Lake City (Oct. 2000)
JU2003 Overlapping lidar scans
Retrieval of Velocity Vectors from Overlapping RHI scans
Dispersion Experiments Dispersion Experiments –– JU2003JU2003
CBD
I-35
I-40
Provide Inflow ConditionsProvide Inflow Conditions•• Experiment Focused on Central Experiment Focused on Central
Business DistrictBusiness District•• Determined ASU Location and IOP Determined ASU Location and IOP
Scan PatternsScan Patterns
NonNon--IOP Times Open to IOP Times Open to Discretionary ScansDiscretionary Scans
ASU Lidar
ASU Lidar PerspectiveASU Lidar Perspective
El. 0.66oEl. 0.4o
El. 0.64oAz. 329.134o
El. 0.64o
Az. 328.83o
El. 1.67oAz. 328 o
El. 1.67oAz. 327.04 oAz. 325.96 o
El. 1.24o
Az. 325.49 o
El. 1.28oAz. 324.54 o
El. 1.28o
Disturbances in BL ThicknessDisturbances in BL Thickness
0 1000 2000 3000 4000 5000 6000 70004
4.5
5
5.5
6
6.5
7Mean radial velocity
Measured VelocityMeasured Velocity
Range [m]
[m/s]
0 1000 2000 3000 4000 5000 6000 70000
1
2
3
4
5
6RMS of radial velocity
Range [m]
[m/s]
•• Data Extraction from Coordinated Data Extraction from Coordinated ScansScans
•• Intersecting RHIIntersecting RHI•• Extract Vectors at IntersectionsExtract Vectors at Intersections
•• Planar overlapping PPIPlanar overlapping PPI•• Dual Doppler RetrievalDual Doppler Retrieval
•• Plume TrackingPlume Tracking•• ARL Data will soon be availableARL Data will soon be available
Dual Lidar OpportunitiesDual Lidar Opportunities
Tracking plume movement with backscatter fieldsTracking plume movement with backscatter fields
ASU LidarASU Lidar
JU2003JU2003
July 8July 8
El: 0.5El: 0.5°°
3:45 UTC3:45 UTC
10:45 PM 10:45 PM LocalLocal
Collaborations with 4DVAR Researchers Collaborations with 4DVAR Researchers (Newsom et al 2003)(Newsom et al 2003)
Data acquired on 11 July, 2003 (1300 CDT). The ARL lidar - RHI raster scans with elevation angles ranging from 0o to 45o at 8os-1, and azimuth angles ranging from 184.4o to 244.4o in 5o steps. The ASU lidar - a similar scan with azimuth angles ranging from 275o to 335o. Processing for both systems - 66-m range resolution and 100 pulse averaging, implying a 5 Hz beam rate.
Results of 4DVAR from CG/AR -ARL-ASU: from R. Newsom 2003
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