基于Capon的机载气象雷达回波谱矩估计  

Spectral momens estimation of airborne weather radar based on Capon

作　　者：卢晓光[1] 

机构地区：[1]中国民航大学智能信号与图像处理天津市重点实验室,天津300300

出　　处：《中国民航大学学报》2014年第3期27-30,共4页Journal of Civil Aviation University of China

基　　金：国家自然科学基金项目(61071194);中央高校基本科研业务费专项(ZXH2012D006)

摘　　要：机载气象雷达是飞机的"双眼",对于保障飞行安全具有重大意义。机载气象雷达通过提取回波的功率、平均多普勒频率和谱宽等3个谱矩信息对气象目标实现检测。本研究利用回波的频谱服从高斯谱的特性建立了回波信号的协方差矩阵模型,推广了应用于线谱估计的Capon方法,提出了一种参数化的广义Capon谱矩估计方法。实验结果表明,提出的参数化方法在信噪比较低的情况下仍有较好的估计性能。Airborne weather radar is a key equipment to detect the turbulence existing in flight path and is very important for aviation safety.The operation of airborne weather radar is mainly based on the estimation of first three spectral momens of radar echoes,including power,mean frequency and spectrum width.A covariance matrix model of the radar echoes is deduced from its Gaussian shape spectrum.And then the Capon method,which is used in line spectrum estimation,is employed to estimate the spectral momens.Finally,Monte Carlo simulations demonstrate the proposed method has a good performance even under low SNR.

关 键 词：机载气象雷达 气象目标检测 回波谱矩 参数化估计方法 

分 类 号：TN974[电子电信—信号与信息处理] V351.37[电子电信—信息与通信工程]