复杂水下环境中的Dual-HFM速度谱优化  

Dual-HFM speed spectrum optimization in complex underwater environments

作　　者：扶钰斌 马晓川[1,2] 李璇 孙博昊[1,2] 陈筱月 裴兴园 FU Yubin;MA Xiaochuan;LI Xuan;SUN Bohao;CHEN Xiaoyue;PEI Xingyuan(Laboratory of Autonomous Underwater Vehicles,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院声学研究所水下航行器实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《系统工程与电子技术》2023年第10期2999-3007,共9页Systems Engineering and Electronics

基　　金：中国科学院声学研究所自主部署“前沿探索”类项目(QYTS202013)资助课题。

摘　　要：在理想环境下,双双曲调频(dual hyperbolic frequency modulation,Dual-HFM)速度谱估计方法可得到高分辨率的连续多普勒估计结果。然而由多径、双目标环境引起的旁瓣干扰,削弱了速度谱方法抑制噪声的能力,影响目标参数估计。针对该方法在多径、双目标等各种复杂水声环境中的应用,进行了深入的讨论,推导了多径、双目标造成的速度谱旁瓣位置,并提出了基于多帧信号的速度谱旁瓣抑制方法,利用另一维度信号空间中目标回波信息与多径杂波旁瓣的差异性,抑制了复杂水下环境中的速度谱旁瓣,并保留了速度谱计算量低的优点。通过数值仿真验证了所提方法的适用性,为低信噪比、多径、双目标环境下的多普勒估计提供了理论依据。The dual hyperbolic frequency modulated(Dual-HFM)speed spectrum estimation method pro-vides high-resolution continuous Doppler estimation results under ideal conditions.However,the sidelobe supp-ression caused by the multipath and dual-target environment weakens the ability of the speed spectrum method to suppress noise and affects the target parameter estimation.In this paper,the application of this method in various complex underwater acoustic environments such as multipath and dual-target is discussed in depth,and the position of the speed spectrum sidelobe caused by multipath and dual-target is derived.The speed spectrum sidelobe suppression method based on a multi-frame signal is proposed.It uses the difference between the target echo information and the multipath sidelobe clutter in the signal space of another dimension to suppress the speed spectrum sidelobe in the complex underwater environment,and retains the advantages of low speed spectrum calculation.The applicability of the proposed method is verified by numerical simulation,which provides a theoretical basis for Doppler estimation in low signal-to-noise ratio,multipath and dual-target envi-ronments.

关 键 词：双双曲调频信号 多普勒估计 多径效应 多帧信号 旁瓣抑制 

分 类 号：TN911.23[电子电信—通信与信息系统]