北极冰层混响多维特性分析及其抑制
Analysis of multidimensional properties from Arctic ice layer reverberation and its suppression
-
摘要: 提出了一种联合区域生长和多维特性差异的北极冰层混响抑制方法。基于冰层反射散射系数变化对混响信号频域特性的影响, 将冰层混响抑制问题转化为对混响信号与目标回波信号在多维特性差异上的特征表述及应用。该方法改进了区域生长技术, 利用近似熵–皮尔逊相关系数联合特征描述不同信号成分一维瞬时频率序列稳定性和相似性差异, 定位回波位置; 结合Rényi熵分析二维时频平面信息分布特性, 优化区域生长过程, 实现了冰层混响的自适应抑制。仿真与北极实测数据结果表明, 该方法能有效抑制不同冰层环境下的混响干扰, 准确提取目标回波,有助于提升有源声呐在北极环境下对目标的探测能力。Abstract: An Arctic ice layer reverberation suppression method combining seeded region growing and multidimensional property differences is proposed. Based on the analysis of the influence of the variations of the ice-layer reflection and scattering coefficients on the frequency-domain characteristics of reverberation signals, the reverberation suppression problem is transformed into the feature description and application of multidimensional property differences between it and the target echo signals. The method improves the seeded region growing method by employing a joint approximate entropy-Pearson correlation coefficient feature to describe the stability and similarity of one-dimensional instantaneous frequency sequences between reverberation and target echoes, thereby localizing echo positions. Combined with Rényi entropy to characterize the information distribution in the two-dimensional time-frequency plane, the region growing process is optimized to suppress adaptive reverberation in ice layers. The results of simulations and real Arctic data demonstrate that the method can effectively suppress reverberation and accurately extract target echoes in various ice layer environments, enhancing active sonar target detection in Arctic environments.