GRW/WACR/M1 - Coherence Filter Contamination

The coherence filter (software) that was added to the WACR under BCR-01500 was causing 
occasional contamination to WACR data.  This was exhibited in the first 2000 m of range by 
streaking in the data over a period of time. It didn't occur often and when it did, it is 
quite obvious looking at the plots.  

On 4/2/2010 at 12:00 UTC, the coherence filter was modified to preclude working on signals 
with a SNR greater than 60 dB.  The vendor thinks this will solve the problem.

• lat
• PowerHotLoad
• Temp_Computer_Enclosure
• Temp_Antenna_Bottom
• SignalToNoiseRatio
• heights
• PowerAmbientLoad
• Temp_LNA
• Polarization
• Temp_Modulator_Control
• PowerTransmitDriver
• Temp_Hot
• txpower
• MMCR Spectral Width(SpectralWidth)
• Temp_ambient
• Noise
• Temp_Outside
• Temp_Future
• base_time
• alt
• time
• time_offset
• wacr_status
• Temp_Chiller
• lon
• Cloud, reflectivity, at altitude(Reflectivity)
• Temp_Antenna_Top
• Temp_Chiller_Supply
• Temp_modulator
• Temp_EIKA
• MMCR Mean Doppler Velocity(MeanDopplerVelocity)
• Temp_Chiller_Return

GRW/WACR/M1 - Reprocessed: Reflectivity and Height Offsets

The instrument vendor informed us of a range (height) offset of 13 m and provided updated 
reflectivity calibration.  All values reported for 'Reflectivity' were approximately 3 dB 
too low.   In addition, the Reflectivity in the first and fourth range gates (starting 
from the surface) needed to be further corrected by an additional 2.7 and -0.9 dB, 
respectively. The 'height' field values were 13.33 m too low.  The data were reprocessed to 
correct these problems.

The grwwacrM1.b1 data were reprocessed and archived in October 2010.  The 
grwwacrspeccmaskcopolM1.a0 and grwwacrspeccmaskxpolM1.a0 data were reprocessed and archived in January 
2012.

• Cloud, reflectivity, at altitude(Reflectivity)
• heights

• Cloud, reflectivity, at altitude(Reflectivity)
• heights

• Cloud, reflectivity, at altitude(Reflectivity)
• heights