Investigation of Doppler beam swinging using TEP radar

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Investigation of Doppler beam swinging using TEP
radar

• Kuo-Feng, Yang
• Acknowledgments
• The TEP data come from
• Dr. Boon-Leng, Cheong

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• Wind field (wind profiler)
• DBS (more than 3 beams) (uniform wind)
• The effect of various beam direction on DBS has
  not been extensively studied in current
  literature.
• We need a radar which has multiple beams and scan
  fast.
• phase array (MU radar)
• radar imaging (TEP)

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Introduction for TEP radar

• Each receiver is separated by 0.5412m
• 915M Hz,Wave length is 0.3278m
• Range resolution is 33m
• The transmitting beam direction is vertical with
  half power beam width of 25
• The IPP is 0.007143 s
• The number of receiver is 56

http//doppler.unl.edu/unltep/tech.html
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15-Jun-2003 125051.9 to 131200.9
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15-Jun-2003 125051.9 to 131200.9
(min)
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Radar imaging

• Fouriers method
• Autocovariance matrix of received signals
• Weighting vector

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• Where
• Power image
• Velocity image

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• Capon method
• Weighting vector
• where

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Power image
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velocity image
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Doppler beam swinging

• Relation between radial and wind field velocity
• Where
• The least square solution is

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Goal of the project

• Statistical analysis of DBS using different of
  beams configuration
• All good pixels/beams (good SNRgt3dB)
• 3 beams (separated by 5 and 10)
• 5 beams (separated by 10)
• Each one has two options Fourier, Capon

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DBS result (Fourier)
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DBS result (Capon)
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Vertical velocity
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Mean wind velocity (Fourier)
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Mean wind velocity (Capon)
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Future work

• Compare theoretical variance of DBS with the
  variance from observation data.
• Quantify the effects of reflectivity reflec
  structures on DBS.
• Compare the results with full correlation
  analysis.