摘要
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，以噪声污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羞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4～5dB；波束形成后，信噪比提高3～5dB。
The self-generated noise of unmanned undersea vehicles （UUV） received by flank array is a primary influencing factor of capability of weak signal detection. In order to trail off the effect introduced by self-generated noise, adaptive noise cancel technique as well as physical noise reduction method and active noise cancel methods is adopted. For the correlation of self-generated noises collected at hydrophone and accelerometer is effeeted by the complex production and propagation of self-gen- erated noise, the performance of the conventional method which 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 （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 experiment indicate that the proposed method has better performs for noise canceling than the conventional method and is easy to implement; the minimum detected SNR with MD-ANC decreases by about 4～5dB than that without MD-ANC; after forming wave beam, the detected SNR with MD-ANC increases by 3～5dB than that.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2008年第10期1210-1214,共5页
Acta Armamentarii
基金
国家自然科学基金资助项目(60572098)
关键词
信息处理技术
弱信号检测
自适应噪声抵消
多通道差分
相关性
information processing
weak signal detection
adaptive noise canceling
multi-channeldifferencing
correlation
