匹配场噪声抑制--一种波束域方法

拖船噪声是一种具有多途角扩展的宽带相干干扰,而拖船噪声抑制是拖线阵声呐系统中的关键技术之一。在现有后置波束形成干扰抵消器的基础上,提出了一种用于本舰干扰抵消的波束域方法,即利用本舰噪声在拖线阵上的拷贝场向量直接进行干扰波束的形成,从而更好地消除本舰强干扰。在环境参数不确定和扫描方向向量存在误差的情况下,该方法比以往研究的阵元域匹配场噪声抑制具有更稳健的性能。仿真结果验证了提出方法的有效性。

Matched Field Noise Suppression: An Approach in Beam Domain

Based on the response of the towed linear array to the noise from the tow ship,a novel approach named MFPIC(Matched Field Postbeamformer Interference Canceller) is proposed to cancel this strong interference.Matched Field Processing(MFP) correlates the replica field and measured field,while MFPIC directly uses the replica field vector to generate interference beam.For towed line array sonar system,MFPIC may provide significant improvement in tow-ship noise suppression,which in turn results in great performance enhancement,and particularly the dead zone of detection around the tow-ship direction could be eliminated.Experimental results based on simulated data for typical towed line array sonar have preliminarily verified the theory and shown great potential of the approach.