基于扩展传播算子的非圆信号测向方法  

Extended Propagator Method for Direction Estimation of Noncircular Signals

作　　者：刘剑[1,2] 黄知涛[1] 周一宇[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073 [2]空军工程大学电讯工程学院,陕西西安710077

出　　处：《信号处理》2008年第4期556-560,共5页Journal of Signal Processing

基　　金：国家自然科学基金(60502040)

摘　　要：现代通信系统大量使用非圆信号,利用经典高分辨算法对其测向没有充分利用非圆信号的信息,因而性能受限。本文提出的扩展传播算子测向算法(EPM)先对数据进行共轭扩展,再利用传播算子方法(PM)测向,充分利用了非圆信号的特点,从而可对多于阵元数的信号进行测向,分辨力和测角精度优于OPM(正交传播算子测向算法)和MUSIC算法,同时保持了PM算法的特点,不需要特征分解(ED)或奇异值分解(SVD)。文中还分析了EPM算法的均方误差性能和计算复杂度,得到了均方误差的解析表达式。仿真实验验证了EPM算法的优良性能,均方误差的理论结果与仿真值相符。Noncircular signals are widely used in modem communication systems. The performance of classical high resolution algorithms for noncircular signals is not so good because the noncircular information is not used. A new direction finding algorithm called Extended Propagator Method （EPM） for noncircular signals is proposed in this paper. It can detect more signals than sensors and has better performance （in terms of resolution and angular precision） than OPM （orthonormal-PM） and MUSIC algorithms. Meanwhile it has the advantages of PM which needs no ED or SVD. The mean square error （MSE） performance of EPM is analyzed and the closed form expression of MSE is given in this paper. The computational complexity of EPM is analyzed also in this paper. Simulation results show the better performance of EPM than OPM and MUSIC algorithms and the accordance between the theoretical results and the simulation results.

关 键 词：阵列信号处理 测向 阵列扩展 传播算子方法 

分 类 号：TN957.51[电子电信—信号与信息处理] TN911.7[电子电信—信息与通信工程]