声被动测向的多小孔径基阵联合宽带降序估计方法  

Multiple Wide-band Source Location Using Multiple Subarray with Small Aperture in the Air

作　　者：郗润平[1] 冯杰[2] 

机构地区：[1]西北工业大学计算机学院,陕西西安710072 [2]中国电子科技集团公司第三研究所,北京100015

出　　处：《探测与控制学报》2008年第4期12-16,21,共6页Journal of Detection & Control

摘　　要：提出了一种基于多个小孔径子阵的宽带声定位方法,并应用于低空多目标的无源定向中。该方法将目标源辐射的低频宽带噪声通过相干处理,然后构造近似的降秩估计器对目标进行方位估计,有效地解决了通常单个小孔径基阵难以满足的多目标分辨和定向精度要求。由于所构造的估计器不需要各子阵之间的位置信息,从而避免了伪峰和位置估计误差对方位估计的影响。仿真和实验结果表明,该方法提高了定向精度,给出了稳定的信号方位估计,能较好地实现大气声定位中对近距离多目标的分辨。This paper presents an approach for the estimation of directions-of-arrival of multiple wide-band sources using multiple small aperture subarrays. A novel signal model used in rank reduction estimator （RARE） is used to deal with information that output from multiple small aperture suharrays. Then the RARE in approximate sense is used to estimate directions-of-arrival of multiple wide-band sources. Source resolution and directional precision are increased by extending array aperture. Moreover, false peak appeared in conventional methods based on eigen-subspace is removed from spatial spectrum effectively in our method. Sensitivity to position error is reduced by robust RARE. Simulation and experiment show that the method has much greater statistical stability and much low threshold of SNR. Especially, the correct DOA estimation can be also obtained in the case of large intersubarray displacement error.

关 键 词：小孔径基阵 声定位 降秩估计器(RARE) 宽带声源 

分 类 号：TN911.7[电子电信—通信与信息系统]