AWR/KAZR/M1 - Snow Buildup

Snow buildup from this system were affecting the sensitivity of the instrument.  Snow was 
cleared on 1/20/16 around 0200 UTC and shows up in the data as a sharp increase in Zh 
values.

• Mean doppler velocity, copolar(mean_doppler_velocity_copol)
• Spectral width, co-polarization(spectral_width_copol)
• sky_noise_copol
• signal_to_noise_ratio_copol
• Reflectivity, co-polarization(reflectivity_copol)

AWR/MWACR/M1 - Transmitter Down

The transmitter was down during this period

• Pitch angle of the ship(pitch)
• Surge directional velocity, bow forward positive(surge_velocity)
• polarization
• Sway: toward port positive(sway)
• gain
• Heave directional velocity, up positive(heave_velocity)
• Sway directional velocity, toward port positive(sway_velocity)
• Heave: up positive(heave)
• surge_acceleration
• gps_heading
• Spectral Width(spectral_width)
• gps_velocity
• sway_acceleration
• Mean Doppler Velocity(mean_doppler_velocity)
• signal_to_noise_ratio
• noise_figure
• noise_power_sky
• Reflectivity(reflectivity)
• gps_timestamp
• heave_acceleration
• Pressure, associated geometric height, at altitude, NGM model output(height)
• Roll: starboard down positive(roll)
• Surge: bow forward positive(surge)

AWR/KASACR/XSACR/M1 - General Quality Statement

The SACR continues to undergo evaluation by the radar instrument mentors, ProSensing, VAP 
developers, DQ Office, site scientists, users, etc.  As more in-depth analysis and 
calibration studies take place, we anticipate that new insights will be gained to increase the 
quality of the data and decrease the uncertainty of the measurements.  This is a 
continuous improvement process and issues will be addressed as they are discovered.

Calibration is very important.  Calibration of the SACRs depends on the careful 
installation of a corner reflector target.  This provides a external calibration reference not 
obtainable with a zenith-pointing radar such as the KAZR.  However, significant data analysis 
is required to assure that the radar is pointing at the target and there are no 
interfering losses in the transmission path.

As issues are discovered, attempts will be made to correct data that is currently in the
Archive.  However, retrospective correction of errors due calibration, signal processing,
component degradation and software bugs may not be possible for many of the data files.

This open-ended DQR is an advisory that some aspects of the data quality are not yet 
known.  It is also a request for users that find issues or questions with the data to contact 
the ARM Radar Engineering & Operations Group Manager, as these issues occur so that they 
can be investigated and corrected if necessary.

• follow_mode
• time_offset
• Copolar correlation coefficient (also known as rhohv)(copol_correlation_coeff)
• polarization_mode
• range
• time
• Differential reflectivity(differential_reflectivity)
• Altitude above mean sea level(alt)
• primary_axis
• sweep_start_ray_index
• platform_type
• radar_antenna_gain_h
• sweep_mode
• azimuth
• radar_antenna_gain_v
• r_calib_xmit_power_h
• nyquist_velocity
• Differential propagation phase shift(differential_phase)
• r_calib_noise_source_power_h
• Spectral Width(spectral_width)
• longitude
• unambiguous_range
• r_calib_time
• r_calib_receiver_gain_vx
• r_calib_noise_vx
• n_samples
• Signal to noise ratio(snr)
• radar_beam_width_v
• sky_noise_copol
• altitude_agl
• North latitude(lat)
• Reflectivity(reflectivity)
• r_calib_noise_source_power_v
• r_calib_receiver_gain_hc
• prt
• scan_rate
• volume_number
• sky_power_copol
• prt_mode
• r_calib_radar_constant_h
• r_calib_noise_hc
• radar_measured_transmit_power_h
• elevation
• base_time
• r_calib_radar_constant_v
• r_calib_two_way_radome_loss_h
• sky_power_xpol
• pulse_width
• sky_noise_xpol
• frequency
• East longitude(lon)
• antenna_transition
• fixed_angle
• r_calib_pulse_width
• latitude
• sweep_number
• time_coverage_start
• radar_beam_width_h
• sweep_end_ray_index
• altitude
• Mean Doppler Velocity(mean_doppler_velocity)
• instrument_type
• r_calib_index
• time_coverage_end

• nyquist_velocity
• sweep_number
• range
• base_time
• frequency
• sky_noise_copol
• sweep_end_ray_index
• scan_rate
• radar_beam_width_h
• r_calib_noise_source_power_v
• altitude_agl
• radar_beam_width_v
• r_calib_noise_source_power_h
• primary_axis
• n_samples
• cross_polar_differential_phase
• time_offset
• Altitude above mean sea level(alt)
• radar_antenna_gain_h
• Mean Doppler Velocity(mean_doppler_velocity)
• time_coverage_start
• radar_antenna_gain_v
• Linear depolarization ratio(linear_depolarization_ratio)
• polarization_mode
• latitude
• sweep_start_ray_index
• sky_power_copol
• r_calib_receiver_gain_vx
• prt
• North latitude(lat)
• elevation
• instrument_type
• Signal to noise ratio(snr)
• follow_mode
• volume_number
• r_calib_two_way_radome_loss_h
• unambiguous_range
• sky_noise_xpol
• pulse_width
• sweep_mode
• r_calib_receiver_gain_hc
• time
• Spectral Width(spectral_width)
• altitude
• time_coverage_end
• sky_power_xpol
• r_calib_xmit_power_h
• longitude
• azimuth
• r_calib_pulse_width
• Reflectivity(reflectivity)
• r_calib_noise_vx
• platform_type
• fixed_angle
• radar_measured_transmit_power_h
• Copol to cross-polar correlation coefficient (also known as rhocx)(co_to_crosspol_correlation_coeff)
• r_calib_radar_constant_h
• r_calib_radar_constant_v
• prt_mode
• r_calib_index
• antenna_transition
• r_calib_noise_hc
• r_calib_time
• East longitude(lon)

AWR/KASACR/XSACR/M1 - Calibration

Note:  These data are not fully calibrated.  The data will be processed to a b1-level data 
product with improved calibration.

• Differential propagation phase shift(differential_phase)
• Spectral Width(spectral_width)
• Differential reflectivity(differential_reflectivity)
• Copolar correlation coefficient (also known as rhohv)(copol_correlation_coeff)
• Mean Doppler Velocity(mean_doppler_velocity)
• Signal to noise ratio(snr)
• Reflectivity(reflectivity)

• Linear depolarization ratio(linear_depolarization_ratio)
• Signal to noise ratio(snr)
• Spectral Width(spectral_width)
• cross_polar_differential_phase
• Reflectivity(reflectivity)
• Mean Doppler Velocity(mean_doppler_velocity)
• Copol to cross-polar correlation coefficient (also known as rhocx)(co_to_crosspol_correlation_coeff)

AWR/MWACR/M1 - Transmitter Down

The MWACR was faulting during these periods causing the transmitter to turn off.  Problem 
was a faulty HV modulator.

• Mean Doppler Velocity(mean_doppler_velocity)
• signal_to_noise_ratio
• Reflectivity(reflectivity)
• Spectral Width(spectral_width)

AWR/XSACR/M1 - Reprocess: Doppler Velocity Reversed

Doppler velocity sign is opposite that of the KaSACR and KAZR

• Mean Doppler Velocity(mean_doppler_velocity)

AWR/XSACR/M1 - Low copol_correlation_coeff at Times

The VPT copol_correlation_coeff (RhoHv) is unusually low at times.  It only last the 
duration of the 15 minute scan normally and will be OK the next scan.  The cause of this is 
currently unknown and the data may actually be OK.  However, use with caution.

• Mean Doppler Velocity(mean_doppler_velocity)
• sky_power_xpol
• sky_power_copol
• sky_noise_copol
• sky_noise_xpol
• Differential propagation phase shift(differential_phase)
• Signal to noise ratio(snr)
• Reflectivity(reflectivity)
• Differential reflectivity(differential_reflectivity)
• Spectral Width(spectral_width)
• Copolar correlation coefficient (also known as rhohv)(copol_correlation_coeff)