NSA/XSAPR/C1 - Data undersampled

The implementation in IRIS caused it to take only 32 samples for HSRHI scan types.

Instrument operation has now been changed to take 80 samples for an elevation sampling of 
0.25 deg. This is oversampling by 4. The rational is that cloud and precipitation 
vertical structure are well captured with oversampling with RHIs.

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