基于相位校正的零点约束直达波抑制方法

Direct path interference suppression based on zero constraint condition with phase correction

在收发分置的系统中,直达波干扰抑制一直是系统的关键技术之一。强直达波干扰本质上是一种典型的强相干干扰。针对双、多基地声呐中的直达波干扰进行了讨论,提出了利用零点约束波束形成进行直达波抑制的方法。该方法通过在直达波的方位附近设置零点对直达波进行抑制,从而估计出目标的方位。鉴于该算法对直达波的相位信息有严苛的要求,提出了基于直达波相位校正的改进方法,提高了算法在实际应用中的宽容性,并通过计算机仿真以及水池试验验证了有效性。

Direct path interference suppression,as a kind of classic strong coherent interference,is one of the key technologies in the bistatic system. According to the research on the direct path interference suppression in the bistatic and multistatic sonars,a method based on zero constraint conditions of beamforming was proposed. The zero constraint was set around the direction of the direct path interference to estimate the direction of the target echo.Because the algorithm must be based on precise phase information on the direct path wave,the improved algorithm based on the phase correction of the direct path interference was raised to improve the tolerance in the practical application. The computer simulation and tank experiment are completed to prove the effectiveness of the algorithm.