A Dual-PRF Scan Mode and Adaptive Doppler-Velocity Dealiasing to Increase Radar Clear-Air Velocity Data Coverage and Usability

Xu, Qin; Nai, Kang; melnikov@noaa.gov, Valery

doi:10.21926/jept.2204034

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A Dual-PRF Scan Mode and Adaptive Doppler-Velocity Dealiasing to Increase Radar Clear-Air Velocity Data Coverage and Usability

2022
By Xu, Qin ; Nai, Kang ; melnikov@noaa.gov, Valery
Source: Journal of Energy and Power Technology, 04(04), 1-16

[PDF-1.96 MB]

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Journal Title:

Journal of Energy and Power Technology
Personal Author:

Xu, Qin ; Nai, Kang ; melnikov@noaa.gov, Valery

Xu, Qin ; Nai, Kang ; melnikov@noaa.gov, Valery 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:

By using long pulses with extended dwelling time, lowered pulse repetition frequency (PRF) and reduced Nyquist velocity, the radar measurement capability can be enhanced to increase clear-air Doppler velocity data coverage (which is beneficial for radar wind analysis and data assimilation and motivated our previous study). This potential capability is further explored (beyond our previous study) by not only modifying the existing operational clear-air scan mode with a lowered PRF and reduced the Nyquist velocity (to nearly 12 m/s) but also coupling this low-PRF scan with a high-PRF scan into a new dual-PRF scan mode. With this dual-PRF scan mode, the velocities from the high-PRF scan can be used to dealias the raw velocities from the low-PRF scan. Doppler velocities collected by using the low-PRF scan in this dual-PRF scan mode exhibit enhanced clear-air data coverage but encounter increased difficulties in dealiasing beyond the radial range covered by the high-PRF scan. To overcome the encountered difficulties, the previously developed alias-robust variational method for analyzing severely aliased radar velocity observations with small Nyquist velocities is further improved adaptively, so reliable reference radial velocities can be obtained and used to dealias the low-PRF scanned raw velocities on range circles beyond those covered by the high-PRF scan.
Keywords:

[+]

Doppler Radar Radar Radar Meteorology Clear-air Data Coverage Dual-PRF Scan Mode General Medicine Velocity Dealiasing
Source:

Journal of Energy and Power Technology, 04(04), 1-16
DOI:

https://doi.org/10.21926/jept.2204034
Document Type:

Journal Article
Funding:

Grant no. NA21OAR4320204
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

[+]

urn:sha256:de9bc7ce784cf0d2eeca7489ae5e03c91ffec5eca5f1bbbd574cb1113befce75
Download URL:

https://repository.library.noaa.gov/view/noaa/47421/noaa_47421_DS1.pdf
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A Dual-PRF Scan Mode and Adaptive Doppler-Velocity Dealiasing to Increase Radar Clear-Air Velocity Data Coverage and Usability

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