一种地形条件下电波传播入射余角估计算法  

A grazing angle estimation algorithm of wave propagation over terrain

作　　者：刘晓娣[1] 周新力[1] 肖金光[1] 张烨[1] 

机构地区：[1]海军航空工程学院电子信息工程系,烟台264001

出　　处：《电波科学学报》2015年第6期1211-1217,共7页Chinese Journal of Radio Science

基　　金：国家自然科学基金(61179016)

摘　　要：入射余角是利用抛物方程模型研究地形条件下电波传播问题的重要参数,但该参数估计具有单次快拍、信号相干和实时性要求高的特点,传统的估计算法难以同时满足上述要求.针对上述问题,提出了基于单次快拍的空间平滑旋转不变性的信号参数估计(Estimating Signal Parameters via Rotational Invariance Techniques,ESPRIT)算法.直接采用单次数据的前后向空间平滑子阵构造centro-Hermitian伪协方差矩阵以实现信号解相干,应用酉变换将复数域的奇异值分解转换为实数域求解,利用ESPRIT算法代替多重信号分类算法估计入射余角.仿真结果表明:该算法能够实现电波传播入射余角的快速估计,准确反映地形起伏对入射余角的影响,与现有算法相比提高了实时性和估计精度.Grazing angle is an important parameter when parabolic equation model is used to solve the wave propagation problem over terrain, the estimation of which has characteristic of single snapshot, coherent signals and high demand of timeliness, however, traditional estimation algorithms hardly meet the requirements simultaneously. To solve the above-mentioned problem, single snapshot spatial smoothing ESPRIT algorithm is proposed. Firstly, spatial smoothing subarrays of the single snapshot are directly used to construct the pseudo-covariance matrix to accomplish the decorrelation. Secondly, singular value decomposition (SVD) is changed into real one by unitary transformation, and estimation of signal parameters via rotational invariance techniques (ESPRIT) is instead of multiple signal classification (MUSIC) to estimate the angle. Simulation results show that the algorithm could achieve the grazing angle estimation fast and effectively, and the timeliness and accuracy could be improved compared with the existing algorithms. Copyright © 2015 by Editorial Department of Chinese Journal of Radio Science

关 键 词：电波传播 抛物方程 入射余角估计 空间平滑 地形 

分 类 号：TN011[电子电信—物理电子学]