圆阵在实际应用中往往存在孔径不足的问题，会导致圆阵方位估计的分辨力和增益受限，而频率多样性是一种用频率信息弥补空域信息的方法，能解决空间采样不足的问题。因此本文对此方法进行改进，提出基于圆阵的被动声呐频率多样性方法，用频率信息弥补圆弧阵声呐孔径的不足，从而解决圆阵孔径受限时方位估计性能不理想的问题。仿真和实验数据处理结果表明，经过频率多样性方法处理后，圆阵的方位估计性能得到有效提升，为圆阵声呐的方位估计提供了一种可行的阵列信号处理方法。
In the practical application of circular array, there is often the problem of insufficient aperture, which will lead to the limitation of resolution and gain of circular array azimuth estimation. Frequency diversity is a method to make up spatial information with frequency information, which can solve the problem of insufficient spatial sampling. Therefore, this paper improves this method, proposes a passive sonar frequency diversity method based on circular array, and uses frequency information to make up for the lack of circular array sonar aperture, so as to solve the problem of poor performance of DOA estimation when circular array aperture is limited. The simulation and experimental data processing results show that the performance of DOA estimation of circular array is improved effectively after frequency diversity processing, which provides a feasible array signal processing method for DOA estimation of circular array sonar.
2020,42(9): 166-170 收稿日期：2020-03-17
DOI：10.3404/j.issn.1672-7649.2020.09.032
分类号：TN971
作者简介：吴秉坤(1995-),男,硕士研究生,研究方向为水声信号处理
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