摘要
针对线性调频(linear frequency modulation, LFM)长脉冲信号在时变水声信道中,因频谱畸变导致匹配滤波处理增益损失的问题,提出一种子脉冲匹配滤波相干累积方法。该方法将长脉冲划分为M个子脉冲,然后进行子脉冲匹配滤波,延时对齐子脉冲匹配峰值后,精确估计子脉冲匹配峰值间的相位差,并进行相位补偿,最后将补偿对齐后的匹配峰进行相干累积以提高增益。仿真和试验数据处理结果表明,该方法通过子脉冲划分可以克服信道相干极限,且能有效降低因频谱畸变引起的长脉冲匹配滤波处理增益损失,同时保持了长脉冲的大时间带宽积优势,为解决时变信道中LFM长脉冲信号主动探测问题提供了一种新的解决思路。
To address the issue of processing gain degradation in matched filtering which caused by spectral distortion of linear frequency modulation(LFM)long-pulse acoustic waveforms propagating through time-varying underwater acoustic channels,this paper proposes a sub-pulse coherent integration method with matched filtering.The long-pulse waveform is partitioned into M sub-pulses for segmented matched filtering.After aligning the matched filter peaks of these sub-pulses,the inter-pulse phase differences are accurately estimated and compensated.The phase-compensated and aligned peaks are then coherently integrated to restore the processing gain.Simulation and experimental results demonstrate that the proposed method effectively overcomes channel coherence limitations through sub-pulse partitioning,significantly mitigating processing gain degradation in long-pulse matched filtering caused by spectral distortion.By preserving the advantageous large time-bandwidth product of long-pulse waveforms,this approach provides a novel framework for addressing active detection challenges of LFM long-pulse signals in time-varying underwater acoustic channels.
作者
罗乐棋
高源
谭君红
杜选民
LUO Leqi;GAO Yuan;TAN Junhong;DU Xuanmin(Shanghai Marine Electronic Equipment Research Institute,Shanghai 201108,China;Han Jiang National Laboratory,Wuhan 430060,Hubei,China)
出处
《声学技术》
北大核心
2026年第1期28-34,共7页
Technical Acoustics
关键词
相干累积
频谱畸变
长脉冲信号
匹配滤波
coherent integration
spectral distortion
long-pulse acoustic signal
matched filter
