单快拍数据预处理的相干信号波达方向估计  

DOA Estimation of Coherent Signals with Preprocessed Single Snapshot

作　　者：毛维平[1] 李国林[1] 谢鑫[1] 

机构地区：[1]海军航空工程学院七系,烟台264001

出　　处：《上海交通大学学报》2014年第10期1362-1367,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金资助项目(61102165)

摘　　要：针对已有的相干信号单次快拍波达方向(direction-of-arrival,DOA)估计算法需要限定入射信号类型或者通过损失部分阵列孔径来放宽限定条件的问题,提出一种新的单快拍解相干算法.算法首先对接收的单次快拍数据做互相关预处理,利用预处理所得的数据重构等效协方差矩阵,再基于多重信号分类法(multiple signal classification,MUSIC)或信号参数估计的旋转不变子空间技术(estimation of signal parameters via rotational invariance techniques,ESPRIT)完成相干信号DOA估计.算法在不损失阵列孔径的同时,无需限定入射信号类型.进一步的快拍数叠加试验表明,在低信噪比条件下,通过随机快拍数据叠加,算法性能较已有算法更好.计算机仿真结果验证了算法的有效性.The existing direction-of-arrival （DOA） estimation algorithms of coherent signals using single snapshot limited the types of incident signals or lost array aperture. To address this problem, the novel al- gorithm was proposed utilizing the cross-correlation information of receiving single snapshot data to consti- tute equivalent covariance matrix. Combined with MUSIC or ESPRIT algorithms, the DOA of coherent signals could be estimated. The proposed algorithm was not dependent upon the types of incident signals and avoided the loss of array aperture. The performance of the algorithm is better than those of the existing algorithms under scenarios of low SNR by randomly superimposing a few snapshots. Computer simulation results confirm the effectiveness of the proposed algorithm

关 键 词：阵列信号处理 波达方向 相干 单次快拍 

分 类 号：TN911.23[电子电信—通信与信息系统]