基于傅里叶积分法的非对称平面阵目标方位估计方法

Estimation of the DOA via A Dissymmetric Planar Array Based on Fourier Integral Method

针对声呐浮标基阵受平台尺寸的影响而信号处理增益及方位分辨力有限的问题,提出了基于傅里叶积分法的适用于非对称平面阵的目标方位估计方法。首先,在傅里叶积分法的基础上,推导了适用于非对称平面阵的目标方位估计理论公式;其次,在各向同性噪声场背景下,计算机仿真分析了该方法的弱目标探测能力、多目标分辨性能及稳健性。理论分析和仿真实验表明,所提方法可以获得远大于原始基阵孔径的虚拟阵列,在低信噪比下可以获得优于传统自适应波束形成的目标方位估计性能,且具有较好的稳健性。

To address the problem of low bearing estimation ability and weak signal processing gain caused by the aperture limited of the sonobuoy,a method of the direction of arrival(DOA)estimation based on Fourier integral method(FIM)is proposed for a dissymmetric planar array.Firstly,the theoretical formula of DOA estimation is derived under FIM,and then,under the assumption that the ambient noise is temporally and spatially white Gaussian distributed,the detection ability of low signal to noise ratio(SNR),resolution and robust is validated by the computer simulations.The theory analysis and numerical simulations demonstrate that,a virtual array with a larger aperture than the original array can be obtained which for a higher signal processing gain by the method proposed,and the ability of the DOA estimation is absolutely better than the common adaptive beam-forming method under a low SNR assumption,and which is similar to the robustness.