圆阵双基地声纳直达波抑制技术研究

Study on direct wave reducing technology based on circular array bistatic sonar

以圆阵为双基地声纳接收阵列流形,提出了一种新的基于多重信号分类(MUSIC)技术的波束形成及零点抑制算法。在理论分析了第一类零点约束条件的基础上,提出了第二类零点(高阶零点)约束条件。给出两类零点约束条件干扰抑制能力的比较。仿真结果表明,该算法可有效接收目标回波信号且屏蔽直达波强干扰。讨论干扰达波方向(DOA)与阵元数对算法直达波抑制能力的影响,以及多源干扰条件下算法的干扰抑制能力。

Based on the circular array assumption of the bistatic sonar, a new kind of beam forming and nulling suppression algorithm based on the multiple signal classification （MUSIC） is proposed. The high order （type-Ⅱ） nulling suppression method is given in this paper after theoretical analyzing of the type-Ⅰ nulling suppression constraints. The comparison of interference suppression performance between those two kinds of suppression constraints is given. The simulation results show that the new algorithm can detect the echo wave signals reflected from the interesting targets and suppress the stong direct interference signals. Moreover, the effects of direction of arrival （DOA） and the number of army elements on the proposed method in interference suppression performance are discussed. The algorithm＇s interference suppression performance under the multiple interference source assumption is also discussed.