针对非圆相干信号的解相干问题,给出了一种新的特征空间算法(eigenspace-direction of arrival,ES-DOA)。利用信号源的非圆特性,虚拟地扩展了阵元个数,使阵列信息增至扩展前的两倍,对信号源数目的估计突破了M-1(M为阵元数)的限制;将信息量加倍后的协方差矩阵加以重构,给出一种新的特征空间算法进行解相干,最大限度地利用了噪声子空间与信号子空间的信息,避免了空间平滑思想的阵列孔径损失及最大似然算法运算量过大的问题;该方法还对信号源功率进行了估计,提高了对小能量信号的估计成功概率。仿真结果表明,该方法对波达方向估计具有很好的鲁棒性。
References
[1]
刁鸣, 安春莲, 万文龙. 非圆信号的四阶累积量测向新方法[J]. 哈尔滨工程大学学报, 2012, 33(1): 112-116.DIAO Ming, AN Chunlian, WAN Wenlong. A novel direction finding algorithm for noncircular signals based on fourth-order cumulants[J]. Journal of Harbin Engineering University, 2012, 33(1): 112-116.
[2]
LIU Aifei, LIAO Guisheng, XU Qing, et al. A circularity-based DOA estimation method under coexistence of noncircular and circular signals[C]//2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP). Kyoto, Japan, 2012: 2561-2564.
[3]
SHAN T J, WAX HAN M, KAILATH T. On spatial smoothing for direction-of-arrival estimation of coherent signals[J]. IEEE Transactions on Acoustic, Speech and Signal Progressing, 1985, 33(4):806-811.
[4]
WILLIAMS R T, SUREBDA P, MAHALANABIS A K, et al. An improved spatial smoothing technique for bearing estimation in a multipath environment[J]. IEEE Transactions on Acoustics, Speech and Signal Progressing, 1988, 36(4): 425-432.
[5]
朱圣棋, 廖桂生,李海,等. 基于数据矩阵的非圆相干信号完全解相关算法[J]. 系统工程与电子技术, 2009, 31(1): 21-24.ZHU Shengqi, LIAO Guisheng, LI Hai, et al. DOA eatimation of coherent signals based on data matrix[J]. Systems Engineering and Electronics, 2009, 31(1): 21-24.
[6]
韩晓东,刁鸣. 冲击噪声背景下均匀圆阵相干信源的DOA估计[J]. 应用科技, 2012, 39(1): 35-38.HAN Xiaodong,DIAO Ming.DOA estimation of uniform circular array and coherent sources in an impulsive noise environment[J].Applied Science and Technology, 2012,39(1):35-38.
[7]
王布宏, 王永良, 陈辉. 相干信号源波达方向估计的广义最大似然算法[J].电子与信息学报, 2004, 26(2): 225-232.WANG Buhong, WANG Yongliang, CHEN Hui. Generalized maximum likelihood algorithm for direction-of-arrival estimation of coherent sources[J]. Journal of Electronics & Information Technology, 2004, 26(2): 225-232.
[8]
庞伟正, 高洪元, 王艳丽. 基于粒子群优化算法的相干信源波达方向估计[J].哈尔滨工程大学学报, 2006, 27(3): 453-456.PANG Weizheng, GAO Hongyuan, WANG Yanli, et al. Estimating direction-of-arrival of coherent source based on particle swarm optimization algorithm[J]. Journal of Harbin Engineering University, 2006, 27(3): 453-456.
[9]
ZHANG Xiaofei, LYU Wen, SHI Ying,et al. A novel DOA estimation algorithm based on eigen space[C]//IEEE 2007 International Symposium on Microwave, Antenna, Propagation, and EMC Technologies for Wireless Communications. Hangzhou,China,2007: 551-554.
[10]
郑春弟, 冯大政, 雷革. 一种利用非圆信号特点的实值DOA估计算法[J]. 数据采集与处理, 2009, 24(2): 193-197.ZHENG Chundi, FENG Dazheng, LEI Ge. DOA Estimation algorithm for non-cicular sources using real-value algorithm[J]. Journal of Data Acquisition and Processing, 2009, 24(2): 193-197.
[11]
崔波, 罗景青. 最小冗余线阵的ES-DOA估计算法研究[J].信号处理, 2010, 26(7): 1016-1020.CUI Bo, LUO Jingqing. Study on ES-DOA estimation algorithm of minimun-redundancy linear arrays[J]. Signal Processing, 2010, 26(7): 1016-1020.
[12]
HASSEN S B, BELLILI F, SAMET A,et al.DOA estimation of temporally and spatially correlated narrowband noncircular sources in spatially correlated white noise[J]. IEEE Transactions on Signal Processing, 2011, 59(9): 4108-4121.
[13]
HUANG Z T, LIU J, ZHOU Y Y. Performance analysis of MUSIC for non-circular signals in the presence of mutual coupling[J]. IET Radar, Sonar and Navigation, 2010, 4(5): 703-711.
