DQRID : D130422.1
Start DateStart TimeEnd DateEnd Time
11/05/2012170006/19/20132359
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Subject:
PVC/DL/M1 - Height-dependent ringing artifact in SNR and velocity field
DataStreams:pvcdlppiM1.b1, pvcdlfptM1.b1, pvcdlcal2M1.b1, pvcdlcal1M1.b1, pvcdlrhiM1.b1
Description:
The AMF1 Doppler lidar has exhibited a height-dependent ringing artifact in the intensity 
(SNR + 1) field since about 5 November 2012. This also affects the Doppler velocities. 
The problem results in a sinusoidal oscillation in the SNR (and velocity) with height. The 
period of the oscillation is roughly 3 km.
The exact cause is not known at this time. However, it is similar to one described in the 
system user manual as being caused by an "unthermalized digitizer."
The problem has been occuring intermittently since 5 November, 2012 (several days after 
hurricane Sandy). On average, it has occurred roughly once every 2 to 3 days, and typically 
persists for 1 to 3 hours at a time.
Suggestions: 
null
Measurements:pvcdlcal2M1.b1:
  • Attenuated backscatter(attenuated_backscatter)
  • Radial velocity(radial_velocity)
  • Intensity (signal to noise ratio + 1)(intensity)
more
pvcdlppiM1.b1:
  • Intensity (signal to noise ratio + 1)(intensity)
  • Radial velocity(radial_velocity)
  • Attenuated backscatter(attenuated_backscatter)
more
pvcdlfptM1.b1:
  • Attenuated backscatter(attenuated_backscatter)
  • Radial velocity(radial_velocity)
  • Intensity (signal to noise ratio + 1)(intensity)
more
pvcdlcal1M1.b1:
  • Intensity (signal to noise ratio + 1)(intensity)
  • Radial velocity(radial_velocity)
  • Attenuated backscatter(attenuated_backscatter)
more
pvcdlrhiM1.b1:
  • Radial velocity(radial_velocity)
  • Attenuated backscatter(attenuated_backscatter)
  • Intensity (signal to noise ratio + 1)(intensity)
more

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