ENA/KASACR/D1 - Minor data issues

The v-channel velocity (uncorrected_mean_doppler_velocity_v) is incorrectly filled with 
NaNs. H-channel is correct. 

The receiver gain (r_calib_receiver_gain_hc and r_calib_receiver_gain_vc) is incorrect. 
This does not affect the data quality. 

The incorrect v-channel calibration constant (r_calib_radar_constant_v) is reported in the 
file. The correct value should be: -20.1884289 (files at the top of the hour) or 
-17.6669998 (files from 20 minutes after the top of the hour) 

Similarly, the reported signal-to-noise ratio (signal_to_noise_ratio_cross_polar_v) is 
calculated using the incorrect v-channel calibration constant, and is biased by a constant 
value of -0.1999974

The reflectivity is calculated with the correct calibration constant and is unaffected.

The h-channel velocity can be used in lieu of the v-channel velocity values. 

The 

h-channel receiver gain can be replaced with a value of 35.7807846 (files at the top of the hour) or 35.0414581 (files from 20 minutes after the top of the hour)

The v-channel receiver gain can be replaced with a value of 35.2723846 (files at the top of the hour) or 34.5820503 (files from 20 minutes after the top of the hour)

The v-channel calibration constant can be replaced by a value of -20.1884289 (files at the top of the hour) or -17.6669998 (files from 20 minutes after the top of the hour).

The v-channel SNR can be corrected by adding 0.1999974 to the values. 


The h-channel velocity can be used in lieu of the v-channel velocity values. 

The 

h-channel receiver gain can be replaced with a value of 35.7807846 (files at the top of the hour) or 35.0414581 (files from 20 minutes after the top of the hour)

The v-channel receiver gain can be replaced with a value of 35.2723846 (files at the top of the hour) or 34.5820503 (files from 20 minutes after the top of the hour)

The v-channel calibration constant can be replaced by a value of -20.1884289 (files at the top of the hour) or -17.6669998 (files from 20 minutes after the top of the hour).

The v-channel SNR can be corrected by adding 0.1999974 to the values. 


The h-channel velocity can be used in lieu of the v-channel velocity values. 

The
 
h-channel receiver gain can be replaced with a value of 35.7807846 (files at the top of the hour) or 35.0414581 (files from 20 minutes after the top of the hour)

The v-channel receiver gain can be replaced with a value of 35.2723846 (files at the top of the hour) or 34.5820503 (files from 20 minutes after the top of the hour)

The v-channel calibration constant can be replaced by a value of -20.1884289 (files at the top of the hour) or -17.6669998 (files from 20 minutes after the top of the hour).

The v-channel SNR can be corrected by adding 0.1999974 to the values.

• r_calib_receiver_gain_vc
• r_calib_receiver_gain_hc
• r_calib_radar_constant_v
• uncorrected_mean_doppler_velocity_v
• signal_to_noise_ratio_cross_polar_v