双目标相干源窄带信号波达方向估计算法  

DOA estimation algorithm for two coherent narrowband sources

作　　者：王心怡[1] 罗松[1] 

机构地区：[1]昆明船舶设备研究试验中心,云南昆明650051

出　　处：《声学技术》2014年第4期363-366,共4页Technical Acoustics

摘　　要：利用水下目标发出的窄带信号,能够实现目标方向的精确估计。针对均匀线列阵接收水下目标窄带信号的特点,提出一种相干源波达方向(Direction of Arrival,DOA)估计的快速算法。通过精确估计目标信号对应的空间频率,直接计算出单目标或双目标信号的波达方向。对该算法进行了理论推导,通过仿真对算法进行验证,并对影响DOA估计精度的因素进行了分析。仿真结果表明,该算法具有较高的估计精度,不受信号时间长度的影响,算法计算量小,便于实时处理,具有较好的工程应用前景。Direction estimation of underwater target could be achieved accurately by using narrowband signal. Aim at the feature of the narrowband signal received by linear hydrophone array, an algorithm of the coherent sources DOA estimation is proposed in this paper, the algorithm can calculate the DOA of a single target or double targets directly by estimating space frequency of target signals. The principle of the algorithm is explained in this paper and simulated with programmed signals; the factors of influencing DOA estimation are also analyzed. The simulation results show that the algorithm has high estimation accuracy, regardless of signal length, the algorithm is convenient for real-time processing, and has a good prospect in engineering applications.

关 键 词：波达方向估计 相干源 空间频率 频率估计 

分 类 号：TB566[交通运输工程—水声工程]