X波段双偏振相控阵雷达的衰减订正算法研究

Study on Attenuation Correction Algorithm of X-Band Dual-Polarization Phased Array Radar

粤港澳大湾区正在组建X波段双偏振相控阵雷达(XPAR)网,以提高观测精度并增强低空观测的能力。为了解决X波段雷达的雨滴衰减问题,以适应观测和组网的要求,引入自适应约束算法,针对降水目标造成的衰减加以本地化研究。评估结果表明,强降水个例反射率因子的订正幅度达6 dB,差分反射率因子的负值也得到有效约束。经过质量控制后,相邻XPAR的空间和强度分布具有更高的一致性。与S波段雷达资料对比,订正前XPAR的强度偏弱,订正后增强至S波段雷达相当强度,局部更强,准确性明显提高。差分反射率因子也得到一定程度的订正,订正后与反射率因子的散点分布更集中,相关系数提高。由此可见,此算法较好地解决了X波段相控阵雷达的雨区衰减问题,为粤港澳大湾区X波段相控阵雷达网资料推广应用和产品开发提供前期数据质量保障。

An X-band dual-polarization phased array radar(XPAR) network is being set up in the Guangdong-Hong Kong-Macao Greater Bay Area(GBA) to improve observation accuracy and enhance low-altitude observation capability.In order to solve the raindrop attenuation problem of X-band radar and meet the requirements of observation and networking,self-consistent algorithm for attenuation correction is introduced and localized.The results show that the correction amplitude of reflectivity factor reaches 6 dB,and the negative value of differential reflectivity is also effectively constrained.Scatter analysis and quantitative statistical results of adjacent XPARs show that the spatial and intensity distributions of the two groups of data after quality control have a high consistency.Compared with S-band radar data which are taken as the truth value,the XPAR intensity of reflectivity factor is weak before attenuation correction,but enhanced to the equivalent strength of the S-band radar after correction,which is stronger locally and the accuracy is significantly improved.Differential reflectivity is corrected to some extent,the scatter distribution of corrected differential reflectivity and reflectivity factor is more concentrated and related coefficient is higher.It can be seen that this algorithm solves well the rain area attenuation problem of X-band phased array radar,and provides early data quality assurance for the promotion and application of X-band phased array radar network data and product development in the GBA.