Underwater Target Depth Classification Method Based on Vertical Acoustic Intensity Flux
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摘要: 现有的基于声场干涉结构特征的目标深度分类方法的频率适用范围有限，仅适用于目标线谱频率激发前2阶简正波的情况。针对上述问题，该文提出基于匹配场处理的目标深度分类算法，该算法将垂直复声强无功分量作为匹配量进行目标深度的匹配估计，利用目标深度的粗略估计结果辅助进行目标深度的二元分类。算法适用于线谱频率激发前3阶简正波的情况，有效拓展了算法的频率适用范围。仿真结果验证了算法的可行性和稳健性。该文分析了环境失配情况对算法性能的影响。所提算法具有较高的准确性和稳健性。Abstract: The existing target depth classification methods based on acoustic interference structure characteristics have a limited frequency range, and are only suitable for the case where target frequency can excite first two modes. Aiming to this problem, a novel target depth classification algorithm based on matching field processing is proposed in this paper. The proposed algorithm uses the reactive component of vertical complex acoustic intensity as matching variable to estimate target depth. The rough estimation results of target depth can be used to assist the binary classification of target depth. This method is suitable for the case where target frequency can excite first three modes, so as to expand the frequency range of the algorithm. The feasibility and robustness of the algorithm are verified by simulation results. The influence of mismatched sea environmental parameters on algorithm performance are also analyzed. The proposed algorithm has high accuracy and robustness.
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表 1 本文算法与现有算法的性能对比
本文算法 现有算法1 现有算法2 现有算法3 现有算法4 现有算法5 目标数目要求 单一目标 单一目标 单一目标 单一目标 单一目标 单一目标 阵元数目要求 单阵元 垂直阵 双阵元 单阵元 垂直阵 单阵元 信噪比要求 ${\rm{SNR }}\ge - 20\;{\rm{ dB} }$ 未分析 未分析 较高(爆炸源) 未分析 较高(气枪) 目标频率适用范围 低频窄带(存在3阶简正波) 低频宽带 低频窄带(存在两阶简正波) 低频宽带 低频窄带 低频宽带 声速分布适用性 弱负梯度
强温跃层弱温跃层 弱负梯度
弱温跃层等声速
弱负梯度无限制 等声速
弱负梯度
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