改进的非相干信号子空间宽带测向算法  

Modified Incoherent Subspace Method for Wideband Direction Finding

作　　者：宫兵[1] 徐以涛[1] 李佳[1] 

机构地区：[1]解放军理工大学通信工程学院,江苏南京210007

出　　处：《无线电工程》2011年第3期11-13,共3页Radio Engineering

摘　　要：研究了非相干信号子空间高分辨率宽带测向算法(ISM),提出了基于最大功率进行频点选择的改进的ISM算法,即将接收的时域信号经傅里叶变换后,选取代表最高功率的子带的频点来构造频谱密度矩阵,然后将该矩阵应用于窄带测向算法进行测向,提高了测向精度,减小了运算量。计算机仿真表明,新算法比原算法在分辨概率达到100%时的信噪比降低了9.5 dB,并且方差也明显比原算法小。This paper presents a new method for high-resolution estimation of the angles of arrival（DOA） of multiple wideband plane waves.The algorithm is based on selecting the frequency point of FFT that stands for the corresponding narrowband with the highest power to build the spectral density matrix.It has better performance and less computation.Simulation results show that the signal-noise ratio（SNR） of the new algorithm is 9.5dB less than the original method when the probability of resolution reaches 100% and the variance is much less,too.

关 键 词：ISM 宽带测向 最大功率 DOA 

分 类 号：TN911.7[电子电信—通信与信息系统]