箔条云的全极化频谱特性  

FULL-POLARIMETRIC SPECTRAL CHARACTERISTICS OF CHAFF CLOUDS

作　　者：李金梁[1] 王雪松[1] 李永祯[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《红外与毫米波学报》2009年第3期198-203,211,共7页Journal of Infrared and Millimeter Waves

基　　金：国家自然科学基金资助项目(60672033);全国优秀博士论文专项基金资助项目(08100101)

摘　　要：基于箔条螺旋下降的运动模型,研究了箔条的转动和平动对箔条云回波信号造成的影响,用统计方法研究了箔条云的全极化频谱特性.首先介绍了箔条螺旋下降的运动模型,给出了转动偶极子的极化散射矩阵,在此基础上分析了箔条云散射矩阵元的自相关函数和互相关函数,给出了散射矩阵元的功率谱和交叉功率谱的表达式,然后给出了均匀取向和水平取向箔条云回波频谱的数值结果.Based on the spiral descending model of chaff, the effect of both rotation and translational motion of chaff on radar echo of chaff clouds was studied and the full-polarimetric spectral characteristics of radar echoes from chaff clouds were investigated by using statistical method. Firstly, spiral descending model of chaff was described, and the Sinclair matrix of a dipole with rotation was given. Based on the above analysis, auto correlation and cross-correlation functions of the Sinclair Matrix elements were investigated and further power spectrum and cross-power spectrum were derived. At last, some numerical results of radar echo spectra for randomly oriented and horizontally oriented chaff clouds were presented.

关 键 词：箔条 转动 极化 相关函数 功率谱 

分 类 号：TN95[电子电信—信号与信息处理]