Acoustic Velocity-Independent 2-D DOA Estimation for Underwater Application

Gengxin Ning;Zhenfeng Liao;Xiaopeng Li;Cui Yang
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Abstract

In this paper, an acoustic velocity-independent two-dimensional direction of arrival (2-D DOA) estimation for underwater application is presented to eliminate the effect of the inaccurate acoustic velocity estimation. According to the geometric relationship between the linear arrays, the proposed method employs the cross correlation matrix (CCM) of the data received by three crossed linear arrays to remove the acoustic velocity factor. The simulation results demonstrate that the proposed method is not susceptible to the acoustic velocity. For a single source, the proposed method outperforms the conventional method in all conditions. For multiple sources, there is a little performance degradation for the proposed method compared with the conventional method. However, the proposed method displays a better performance than the conventional method in situations where the signal to noise ratio (SNR) is extremely low or the acoustic velocity estimation error is non-negligible. Furthermore, the computational complexity of the proposed method is lower than that of the conventional method using the same amount of sensors in total, while the performance is still acceptable.
水下不依赖声速的二维DOA估计
为了消除声速估计不准确的影响,提出了一种与声速无关的水下二维到达方向估计方法。该方法根据线性阵列之间的几何关系,利用三个交叉线性阵列接收到的数据的互相关矩阵(cross - correlation matrix, CCM)去除声速因子。仿真结果表明,该方法不受声速的影响。对于单一信号源,该方法在所有条件下都优于传统方法。对于多信号源,与传统方法相比,该方法的性能下降较小。然而,在信噪比极低或声速估计误差不可忽略的情况下,该方法表现出比传统方法更好的性能。此外,该方法的计算复杂度低于使用相同数量传感器的传统方法,而性能仍然可以接受。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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