Observational Deviation and Correction Caused by Multi-Beam Scanning Mode from X-Band Phased Array Weather Radar
ZHU Jiashan
LIU Liping
WU Chong
ZHOU Qinqiang
LIU Yanzhong
GAO Sinan
GENG Fei
HUANG Hui
Abstract：Currently,phased array weather radar has become increasingly widespread in China.Its efficient and flexible electronic scanning mode significantly improves the radar's observation efficiency,making it adaptable to different observation tasks.However,the instability of phased array antenna's performance parameters also poses new challenges for data quality control.To examine the rationality of multi-beam scanning mode of phased array radar and its impact on data quality,this study quantitatively compared observation data from three X-band dual-polarization phased array weather radars in Guangzhou and one S-band new-generation dual-polarization Doppler weather radar.The study evaluated sensitivity changes and observational deviations at various elevation angles,as well as their underlying causes,under both single-beam and multi-beam scanning modes.The results indicate that in the multi-beam mode,observation deviation in ZH and ZDR of the phased array radar increases with the beam direction deviating from the normal direction in the antenna array surface.The uneven distribution of antenna gain within the wide transmission beam causes data at various elevation angles to exhibit periodic fluctuations consistent with the transmission beamwidth.Through the proposed correction,the average observational deviation of ZHat different elevation angles in the multi-beam mode is controlled to approximately-0.6 dB.This study provides a scientific basis and framework for data quality control and advanced application of phased array radar.
Keywords：phased array weather radardual polarization weather radarreflectivity factordata qualityquantitative analysis
Publication Date：2025-10-25
Online Publishing Date：2025-11-25(First online date of this platform, not the publication date of the document)
Pages：14( 647-660 )