| Description: | The cross-polarization returns were higher than the co-polarization returns causing a
positive linear depolarization ration. This cannot be correct. Upon further investigation,
it was suggested that waveguide going to the antenna feed polarizer was possibly rotated
by 45 degrees resulting in the antenna transmitting circular polarization rather than
linear polarization. Rotating the polarizer in June did not correct the problem.
It turns out that there is a polarizer in the antenna feed. Rotated the OMT by 45 degrees
and substituted micro-coax cable instead of waveguide.
During the time covered by this DQR, the "co-polarization" variables are circularly
polarized opposite of the transmitted polarization. The "cross-polarization" variables are the
same circular polarization as the transmitted signal. |
| Measurements: | nsakazrgeC1.b1: - Mean doppler velocity, cross-polar(mean_doppler_velocity_xpol)
- cal_constant_xpol
- signal_to_noise_ratio_xpol
- Spectral width, cross-polar(spectral_width_xpol)
- Mean doppler velocity, copolar(mean_doppler_velocity_copol)
- Reflectivity, cross-polar(reflectivity_xpol)
- Reflectivity, copolar(reflectivity_copol)
- Spectral width, copolar(spectral_width_copol)
- signal_to_noise_ratio_copol
- cal_constant_copol
nsakazr3253C1.a0:
nsakazrciC1.b1: - cal_constant_copol
- cal_constant_xpol
- Mean doppler velocity, copolar(mean_doppler_velocity_copol)
- Reflectivity, cross-polar(reflectivity_xpol)
- signal_to_noise_ratio_xpol
- Reflectivity, copolar(reflectivity_copol)
- signal_to_noise_ratio_copol
- Mean doppler velocity, cross-polar(mean_doppler_velocity_xpol)
- Spectral width, cross-polar(spectral_width_xpol)
- Spectral width, copolar(spectral_width_copol)
|