水下多传感器基阵波束域高分辨方位估计方法及实验研究

针对水声设备的实际应用，给出了基于实测基阵阵列流形的波束域高分辨方位估计的MUSIC方法。在预形成多波束时，该方法采用适用于任意阵形的自适应波束优化技术，针对水下实际阵列设计超低旁瓣波束以抑制水面上分布的强干扰。为了减小实际阵列模型和理想阵列模型失配所带来的不利影响，在多波束设计时，利用实测阵列流形代替理想阵列流形进行设计，消声水池实验结果验证了该方法可以有效地降低系统中由于阵列模型失配所造成的波束域MUSIC方位估计方法的性能损失。

A Beam-Space High-Resolution Bearing Estimation Method for Underwater Physical Array and Its Experimental Studies

In order to reduce the negative effect for DOA estimation from strong interfering signals distributed over the sea surface, low-sidelobe is needed when multibeam is preformed in beam-space MUSIC. Due to array model mismatch between practical array manifold and ideal array manifold, expected sidelobe level can not be reached. Therefore, we present a new beam-space high resolution bearing estimation method. The method adopts adaptive beam optimization based on measured array manifold to design multibeam with low-sidelobe. The influence of array mismatch errors between ideal manifold and practical manifold can be effectively alleviated. Thus, expected low-sidelobe can be obtained in beampattern. Moreover, the method can be used for arbitrary geometry array. Anechoic tank experimental results show that better performance of direction estimation can be obtained with our method.