对非合作信号的盲检测是水声侦察对抗和参数估计的必要前提，基于能量和自相关等的传统检测方法并未有效利用信号的频段信息，不利于实现对湮没于宽带噪声中带限脉冲信号的检测。新方法在对接收数据流进行时频联合分析的基础上，在时间/频率2个维度提取超出阈值门限的脉冲信号与后续数据流进行匹配滤波处理，并以滤波器输出作为序贯检测量，实现对后续重复脉冲的盲检测。在相同的信噪比下，新方法的检测输出PAR优于传统方法约4 dB，湖试结果验证了方法的可用性。
Traditional blind detectors confront difficulty in detecting non-cooperative band-limited pulse signals with low SNR. A new method is proposed in this paper. After STFT, extract part of the received data above limits in time-frequency domain and use it as replica to match with the following received data. Outputs of match filter over threshold are used to implement blind detection of the repeated non-cooperative pulse signal hided in noise. It′s performance is better than traditional methods 4 dB approximately and tested in trial data.
2023,45(1): 157-162 收稿日期：2022-02-14
DOI：10.3404/j.issn.1672-7649.2023.01.028
分类号：TB567；TN911.23
基金项目：水声技术重点实验室基金资助项目（JCKYS2021604SSJS014）
作者简介：邓红超(1976-),男,博士,高级工程师,研究方向为水声信号处理
