TY  - JOUR
AU  - Xu, Qin
AU  - Nai, Kang
AU  - Melnikov, Valery
PY  - 2022
DA  - 2022/10/13
TI  - A Dual-PRF Scan Mode and Adaptive Doppler-Velocity Dealiasing to Increase Radar Clear-Air Velocity Data Coverage and Usability
JO  - Journal of Energy and Power Technology
SP  - 034
VL  - 04
IS  - 04
AB  - 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.
SN  - 2690-1692
UR  - https://doi.org/10.21926/jept.2204034
DO  - 10.21926/jept.2204034
ID  - Xu2022
ER  -