【摘要】 为了利用立体阵进行远程低空目标方位估计,提出了一种基于信号相位匹配原理的奇异值分解(SVDSPM)方位估计算法。推导了方位搜索需要的时延计算一般公式;分析了目标距离、立体阵高度、传声器位置误差和接收通道幅度和相位不一致性等对定向性能的影响;理论分析和仿真结果说明:只有利用立体阵才能消除俯仰角方向的声探测盲区;当选择合适的阵高度传声器位置误差,并且接收通道幅度和相位不一致性满足工程精度条件时,可实现远程低空目标的定向。更多还原

【Abstract】 We believe that the existing methods for DOA(direction of arrival) estimation of long range and low altitude target can still be improved.There are two factors whose consideration,in our opinion,should be carefully reexamined:(1) the estimation algorithm;(2) the configuration of array parameters.In the full paper,we explain in some detail our new method;here we give only a briefing.Section 1 of the full paper combines SVDSPM(singular value decomposition based on signal phase matching) algorithm with arbitrary acoustic volume array and derives eqs.(1) through(16),among which eqs.(4) and(16) are the most important.Section 2 gives the error analysis of DOA estimation,which requires eqs.(17),(18),(20) and(24) derived by us.Section 3 simulates the DOA estimation algorithm with the conical acoustic volume array and presents the error analysis.The analysis of the simulation results,which are given in Fig.3 through 7,concludes preliminarily that:(1) only with the acoustic volume array can the sound detection blind area be removed;(2) the error of DOA estimation is smaller than 0.50 under the following conditions:(a) sensor position error,channel gain and phase inconsistencies are smaller than 0.01 m,1.5 dB and 100 respectively;(b) the distance between elements of array equals 0.84 m;(c) signal to noise ratio(SNR) equals 20 dB.更多还原