强降雨区传播效应对双基地系统辅站雷达探测能力的影响  

THE PROPAGATION EFFECT OF HEAVY PRECIPITATION ON THE DETECTING CAPABILITIES OF BISTATIC RADAR SYSTEM

作　　者：吴迪[1,2] 王振会[1,2] 杨通晓[3] 王蕙莹[2] 

机构地区：[1]南京信息工程大学气象灾害省部共建教育部重点实验室,江苏南京210044 [2]南京信息工程大学大气物理学院,江苏南京210044 [3]上海市气象局,上海200030

出　　处：《热带气象学报》2013年第6期1029-1036,共8页Journal of Tropical Meteorology

基　　金：国家自然科学基金(40875016);教育部高等学校博士学科点专项科研基金(20060300002)共同资助

摘　　要：以电磁场散射理论为基础,在已有的小椭球粒子群双基地多普勒雷达气象方程中加入了传播效应项,利用此方程探讨旋转椭球雨滴群旋转轴一致铅直向上,双基地系统在探测均匀雨区、移动雨区和不均匀分布雨区时传播效应的影响。通过与单基地雷达回波功率比较可知,传播效应的存在使得双基地系统辅站一侧回波功率比高值区的范围变大,主站雷达一侧传播效应对回波功率的影响与入射波的偏振关系有关。In this paper, based on an electromagnetic scattering theory, we add a propagation effect factor to derived bistatic radar equations over ellipsoid raindrops. By supposing all the ellipsoid rotation axises are vertical, we use these equations to study the propagation effect of a bistatic radar system for detecting different distributed rainfall areas. By comparing the echo power with monostatic radars we can see that the propagation effect increases high-value areas of echo power ratios around the receiver radar compared to the side of the main radar in the bistatic radar system. Moreover, the propagation effect is related with the polarization of incident electromagnetic waves.

关 键 词：双基地雷达 回波功率比 传播效应 探测能力 降水 

分 类 号：P434.4[天文地球—大气科学及气象学]