基于多通道差分的自适应噪声抵消方法

水下航行器舷侧阵的自噪声是影响其弱信号检测能力的主要因素。为减小其影响，通常除了采用物理降噪、主动降噪等方法外都还采用自适应噪声抵消技术。由于自噪声产生和传播的复杂性，以噪声源附近加速度计输出作为参考信号的自适应噪声抵消效果较差。考虑到自噪声和远程目标信号空间的差异性，充分利用阵列上不同位置水听器接收到的信息，本文提出了多通道输出延时求差形成多路参考信号的自适应抵消方法-MD-ANC方法。湖试结果表明，该方法噪声抵消效果显著而且实现方便。在同样的实验环境下，最低检测信噪比相对于未经处理的降低了约4—5 dB；波束形成后，信噪比提高3～5 dB.

A Method of Adaptive Noise Canceling Based on Multi-channel Differencing

The self-generated noise of unmanned undersea vehicles (UUV) received Dy flank array is a primary influencing factor of capability of weak signal detection. In order to trail off the effect intro?duced by self-generated noise, adaptive noise cancel technique as well as physical . noise reduction method and active noise cancel methods is adopted.セor the correlation of self-generated noises collect?ed at hydrophone and accelerometer is effected by the complex production and propagation of self-gen?erated noise, the performance of the conventional method wmch utilizes the output of accelerometer near the noise source as reference signal is limited. Considering the spatial difference between targets’ signal in far-field and self-generated noise, multi-channel differencing adaptive noise canceling v MD- ANC) was proposed for adaptive noise canceling, which adopts the difference among delayed outputs of hydrophone array based on direction-of-arrival as multi-channel reference signals. Results of lake ex?periment indicate that the proposed method has better performs for noise canceling than the conven?tional method and is easy to implement; the minimum detected SNR with MD-ANC decreases by about 4 ?5 dB than that without MD-ANC; after forming wave beam, the detected SNR with MD-ANC in?creases by 3?5 dB than that.