双基地多普勒天气雷达子站接收功率的校正  

Power Calibration for Bistatic Doppler Radar Receiver

作　　者：火焰 陈钟荣[1] 胡胜[2] 顾松山[1] 

机构地区：[1]南京信息工程大学电子工程系,南京210044 [2]广东省气象台,广州510080

出　　处：《仪器仪表学报》2005年第z1期539-542,共4页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金资助项目(40275010)

摘　　要：散射体对电磁波的散射是向着空间各个方向的,散射的能量随着散射角的不同而变化。双基地雷达接收机子站所接收到的能量是散射体的侧向散射。文章针对于降水粒子的侧向散射特性,利用T矩阵法数值计算波长10.7cm时,各种大小的0℃、10℃的水滴以及0℃、-10℃的冰球粒子的侧向散射矩阵和散射角的变化关系,指出粒子会因为不同的大小而导致结果有差异,但仍然可以用事先计算出的结果对侧向散射进行校正。尤其是对直径小于1.0cm的冰球粒子可以用1.0cm的冰球粒子的结果直接进行校正。这里的结果可以为双基地雷达子站接收机研究以及工程设计提供一定的参考。The receivers of bistatic Doppler radar can detect the scatter's oblique radiation which varies with the scattering angle relative to the transmitted beam of Doppler radar's transmitter.Based on the scattering theory,the T-matrix method and the theory of meteorological precipitation drop,the normalized scattering matrix and the relationships between characters of the matrix and the bistatic scattering angle are calculated and discussed.The calculated results of 01cm raindrop are used to calibrate drops which are smaller than 01cm,but as for those greater,the relative calculations have to be needed.As for hails,results show that the diameter have a strong impact on the scattering of particles instead of the temperatures.The same diameter particles of 10cm and 20cm have almost equal values.Results could be used in the bistatic Doppler radar receiver's calibration and designment.

关 键 词：双基地 侧向散射 归一化散射矩阵 T矩阵 

分 类 号：TH7-55[机械工程—仪器科学与技术]