利用多级时延估计与传递函数拟合的水下自干扰抑制法  

Underwater self-interference suppression method based on multistage delay estimation and transfer function fitting

作　　者：王博恒 张群飞[1] 史文涛[1] WANG Boheng;ZHANG Qunfei;SHI Wentao(School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 710072)

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《声学学报》2023年第4期820-830,共11页Acta Acustica

基　　金：水声技术重点实验室稳定支持课题(JCKYS2021604SSJS011)。

摘　　要：提出了一种利用传递函数拟合与多级时延估计相结合的自干扰抑制方法来抑制接收信号中的强自干扰信号。首先通过频域解卷积估计发射泄漏的传递函数,进而构建出基本的对消信号,再通过互相关法与互谱法相结合的多级时延估计,精细补偿对消信号,获得良好的自干扰抑制效果。对实际海试数据的处理结果表明,当采用无人水下航行器(UUV)搭载一体化系统,在舷侧阵工作扇面内发射多帧线性调频(LFM)信号对目标船进行有源探测时,该方法的抑制比可达36 dB,且使得可检测回波的信干比从-30 dB降低到-55 dB,对后续的自干扰信号存在同样的抑制效果。以上结果表明该方法可抑制强自干扰信号,呈现出了较强的稳定性,使得淹没于强自干扰信号中的回波信号得以检测。In order to suppress strong self-interference signals in received signals,a self-interference suppression method based on transfer function fitting and multistage delay estimation is proposed.Firstly,the transfer function of transmitting leakage is estimated by frequency domain deconvolution to construct the basic cancellation signal.Then,the multistage delay estimation based on the cross-correlation method and the cross-spectrum method is used to accurately compensate the cancelling signals to obtain a good self-interference suppression effect.The processing results of the actual sea trial data indicate that the suppression ratio of the proposed method can reach 36 dB,and the signal-to-interference ratio of the detectable echo can be reduced from -30 dB to-55 dB when the unmanned undersea vehicles(UUV) integrated system is used to transmit multi-frame linear frequency modulated(LFM)signals in the working sector of the side array for active detection of the target ship.The same suppression effect is found for the subsequent self-interference signals.The above results indicate that the method can suppress the strong self-interference signal,and presents stability,so that the echo signal submerged in the strong self-interference signal can be detected.

关 键 词：自干扰抑制 水下探测通信一体化 回波检测 时延估计 

分 类 号：TN929.3[电子电信—通信与信息系统]