基于时频分布图相似度匹配的水下声源定位方法

Underwater Sound Source Location Based on Similarity of Time-frequency Distribution Diagram

针对水下目标深度距离估计,将图像内容检索技术引入匹配场定位,提出一种利用接收信号时频分布图做相关的声源定位方法。论文将此方法应用于硬底均匀浅海声场,对实际接收信号进行时频表示,得到包含声源深度与距离信息的标准时频分布图,利用相关图像处理技术标记图像指纹,粗定位比对后判断预测场范围;根据预测场各点位模拟信号与实际信号的时频分布图相关程度实现声源位置估计。通过仿真验证该定位方法的抗噪声性能,结果表明,论文算法对噪声具有较好抑制作用,可以准确实现水下声源的距离与深度估计。

Aiming at underwater target depth and distance estimation,image content retrieval technology is introduced into matching field location.A sound source location method based on time-frequency distribution of received signals is proposed.In this paper,the method is applied to the hard bottom uniform shallow sea sound field.The actual received signal is represented by time frequency,and the standard time frequency distribution diagram containing the depth and distance information of the sound source is obtained.The image fingerprint is marked by the relevant image processing technology,and the range of the predicted field is de⁃termined after rough positioning and comparison.According to the correlation degree of the time-frequency distribution diagram be⁃tween the simulated signal and the actual signal at each point of the predicted field,the source position is estimated.The anti-noise performance of the proposed positioning method is verified by simulation.The results show that the proposed algorithm has a good suppression effect on noise and can accurately estimate the distance and depth of underwater sound sources.