SGP/XSAPR/I6 - Azimuthal Drift

The azimuth and elevation position were drifting over time.  The position reported in the 
files for the radar is not accurate and has an offset in azimuth at times.  There are 
periods in the data where the offset is constantly changing from scan to scan.

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• Signal quality index(sig_qual_index)
• Attenuation corrected differential reflectivity(diff_reflectivity_corr)
• Differential propagation phase shift(dp_phase_shift)
• Specific differential phase(diff_phase)
• Attenuation corrected reflectivity(reflectivity_corr)
• Doppler spectral width, clutter filtered(doppler_spectral_width)
• Mean doppler velocity(mean_doppler_velocity)
• Differential reflectivity, clutter filtered(diff_reflectivity)
• Unfiltered reflectivity(reflectivity_unf)
• reflectivity(reflectivity)
• Lag-0 co-polar correlation coefficient, clutter filtered(copol_coeff)