NSA/MPL/C1 - Detector Failure

Beginning 12/25, the signal return displayed serious aliasing, reflection, or ringing of 
the detector, with a highly repetitive pattern repeating six or more times within the 
lowest 15 km.  On 01/02, the detector became very difficult to put into any type of operating 
condition. When it did operate, the "aliased" signal pattern was still present.

The detector was replaced.

• Laser Temperature(laser_temp)
• Laser output energy per pulse(energy_monitor)
• Background signal standard deviation(background_signal_std)
• Attenuated backscatter(signal_return)
• Background Signal(background_signal)

NSA/MPL/C1 - Missing data

System was down for detector replacement.

• Preliminary cloud base height(preliminary_cbh)
• base time(base_time)
• Laser Temperature(laser_temp)
• Number of detector channels(num_channels)
• Attenuated backscatter(signal_return)
• Dummy altitude for Zeb(alt)
• Background Signal(background_signal)
• effective range offset due to poor sync between laser firing and A/D trigger.(range_offset)
• Polarization control enabled flag(polarization_control)
• Array of heights for the range gates(height)
• time(time)
• Number of laser pulses summed during averaging interval(shots_per_avg)
• lat(lat)
• Time offset of tweaks from base_time(time_offset)
• Detector Temperature(detector_temp)
• Number of bins stored in data block(num_bins)
• range(range)
• Telescope temperature(scope_temp)
• Distance from leading edge of first range bin to the center of each bin .(range_bins)
• Dead time correction flag(dead_time_corrected)
• Width of range-bins calculated from range_bin_time(range_bin_width)
• Polarization control voltage setting(polarization_control_voltage)
• lon(lon)
• Time in nanoseconds for each range bin of multichannel scalar card.(range_bin_time)
• Repetition Rate, or Trigger Frequency of the laser(pulse_rep)
• Maximum altitude retrieved from multichannel scalar card.(max_altitude)
• Laser output energy per pulse(energy_monitor)
• Background signal standard deviation(background_signal_std)

NSA/MPL/C1 - No cross polarized data

The cross polarizor was not functioning so there is no cross polarized data.  All data 
during the specified period is circularly polarized.

• Attenuated backscatter(signal_return)

NSA/MPL/C1 - Bad Cross-Polarized data

The polarizer box was not recycled when the system was rebooted; thus only circularly 
polarized light was being emitted.  Ignore all cross polarized data.

• Attenuated backscatter(signal_return)
• Polarization control voltage setting(polarization_control_voltage)

• Background signal, cross-pol(background_signal_cross_pol)
• *(aqc_signal_return_cross_pol)
• Background signal standard deviation, cross-pol(background_signal_std_cross_pol)
• Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
• Polarization control voltage, cross-pol(polarization_control_voltage_cross_pol)
• Attenuated backscatter, cross-pol(signal_return_cross_pol)

• Preliminary cloud base height above ground level, cross-pol(preliminary_cbh_cross_pol)
• Background signal standard deviation, cross-pol(background_signal_std_cross_pol)
• Background signal, cross-pol(background_signal_cross_pol)
• *(aqc_signal_return_cross_pol)
• Polarization control voltage, cross-pol(polarization_control_voltage_cross_pol)
• Attenuated backscatter, cross-pol(signal_return_cross_pol)