双线阵左右舷模糊共轭抵消方法研究

左右舷分辨问题是拖曳线列阵研究的一个重要问题。本文通过研究平行双线阵的归一化波束输出函数,得到了一种通过对双线阵常规波束形成的输出进行幅度和相位加权来提高左右舷模糊抑制能力的方法。该方法通过分析双线阵的归一化波束输出函数,获得补偿权值,并利用双阵波束输出的幅度加权和相位补偿来抵消目标共轭(镜像)方向的输出,以达到左右舷抑制比最大的目的。数值仿真和海试结果表明,本方法简单实用,能较好的提高双线阵的左右舷抑制比,特别在宽带条件下效果更加明显。

Research on a conjugate cancelling method of port and starboard ambiguity for twin-line array

It is always an important problem of distinguishing the target's port or starboard in sonar signal processing of towed array.This paper presents a method that can improve the ability of restraining the port and starboard ambiguity via equalizing the amplitude and phase of the conventional beam forming output based on the unitary beam forming function.This method gets the weight value from the unitary beam forming function and then uses them to equalize the phase of the output of the conventional beam forming to cancelling the conjugate (mirror) output and get maximized port and starboard restrain ratio.The data simulation and sea trail data analysis proved that this is a simple and practical method and gave better result in improving the restrain ratio,especially on wide band condition.