干扰条件下的水声直扩信号非合作检测方法

Non Cooperative Detection Method of Underwater Acoustic DSSS Signal Under Disturbed Condition

为了将倒谱法应用于周期性脉冲干扰和船舶辐射噪声条件下的水声直扩信号的非合作检测,通过处理海上实测数据,分析了周期性脉冲信号和船舶辐射噪声的倒谱特征;采用频谱分析和倒谱联合检测法有效抑制了倒谱检测中周期性脉冲干扰的影响;采用倒谱—小波分解联合检测法提高了船舶辐射噪声背景下直扩信号检测的性能,并通过仿真进行了验证。该研究对复杂水声环境下直扩信号的非合作检测方法的研究有一定借鉴意义。

In order to apply cepstrum to detect underwater acoustic signals in periodic impulsive interference and ship noise, through actual signal at sea, the cepstrum characterristics of periodic pulse signals and ship radiated noise are analyzed.Spectrum analysis and cepstrum are used to effectively suppress the pulse interference.Cepstrum and wavelet decomposition methods are used to improve detection performance under ship noise.