双基地雷达系统探测椭球雨滴群时主站仰角对探测性能的影响  

Effects of Transmitting Antenna Elevation on Bistatic Polarization Radar System Ability Detecting Rotatory Spheroidal Raindrops

作　　者：王蕙莹[1,2] 王振会[1,2] 杨通晓[2,3] 吴迪[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：《高原气象》2013年第4期1165-1173,共9页Plateau Meteorology

基　　金：国家自然科学基金项目(40875016);教育部高等学校博士学科点专项科研基金项目(20060300002);江苏高校优势学科建设工程资助项目(PAPD)

摘　　要：为了提高双基地偏振雷达的探测精度,从旋转椭球粒子散射和衰减的理论出发,推导出基于椭球雨滴群的双基地偏振雷达方程,并利用此方程探讨了旋转椭球雨滴群一致垂直取向情况下,主站雷达发射仰角、目标粒子群位置等因素对双基地偏振雷达探测能力的影响程度。结果表明,随着仰角的抬高,几何因子值和两种偏振状态下的回波功率比均出现了高值区和低值区面积减少的变化特征;散射截面因子值也随着仰角的抬高在水平偏振时增加,垂直偏振时减少。In order to improve the detecting accuracy of bistatic polarization radar,bistatic radar equations for spheroid raindrop groups have been deduced based on electromagnetic scattering theory.By supposing all the particle rotation axis are vertical upward,these equations are used to discuss the effect of the elevation of transmitting antenna and the position of raindrops on the detection ability for bistatic polarization radar system.The results show that the areas of high and low values in the distribution of geometric factor and the ratio of echo power at horizontal and vertical polarization are all reduced as the elevation lifted.The value of scattering cross-section factor increases at horizontal polarization but decrease at vertical polarization as the elevation lifted.

关 键 词：双基地双线偏振雷达 旋转椭球粒子 探测性能 

分 类 号：P406[天文地球—大气科学及气象学]