Estimation of Transmitted Differential Phase on Dual-Polarization Radars

Zrnić, D.S.; Melnikov, V.M.

doi:10.1175/JTECH-D-22-0014.1

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Estimation of Transmitted Differential Phase on Dual-Polarization Radars

2023
By Zrnić, D.S. ; Melnikov, V.M.
Source: J. Atmos. Oceanic Technol., 40, 1221–1239

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Journal Title:

Journal of Atmospheric and Oceanic Technology
Personal Author:

Zrnić, D.S. ; Melnikov, V.M.

Zrnić, D.S. ; Melnikov, V.M. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; NSSL (National Severe Storms Laboratory) ; CIWRO (Cooperative Institute for Severe and High-Impact Weather Research and Operations)

OAR (Oceanic and Atmospheric Research) ; NSSL (National Severe Storms Laboratory) ; CIWRO (Cooperative Institute for Severe and High-Impact Weather Research and Operations) Less -
Description:

A measurement procedure to determine transmitted differential phase between horizontally and vertically polarized radiation of a dual-polarization radar is presented. It is applicable to radars that transmit and receive simultaneously horizontally and vertically (SHV) polarized waves. The method relies solely on weather data with no instrument intrusions whatsoever. It takes data at vertical incidence while the antenna rotates in azimuth. That way, a large number of samples is collected to reduce statistical errors in estimates. The theory indicates that the transmitted differential phase appears prominently in the backscatter signals off the melting layer. That and relations between various elements of the backscattering matrix are used to derive a set of nonlinear equations whereby the differential phase on transmission is one of the unknowns. Steps for solving these equations are presented as well as a demonstration of the results on radar data. A simplified algorithm that bypasses the coupled nonlinear equations is exposed. Conditions under which the simplification can be applied are presented. These restrict the range of the transmitted differential phase for which the simplified procedure may be applied.
Keywords:

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Quality Control Radar Signal Processing Data Quality Control Radar Observations Weather Radar Signal Processing
Source:

J. Atmos. Oceanic Technol., 40, 1221–1239
DOI:

https://doi.org/10.1175/JTECH-D-22-0014.1
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PDF
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Journal Article
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urn:sha256:1ff018ec79b982331f76c97d105f8f0535a78f840c61a383b460c82aea244925
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https://repository.library.noaa.gov/view/noaa/56138/noaa_56138_DS1.pdf
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Estimation of Transmitted Differential Phase on Dual-Polarization Radars

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