声纳精确定向方法研究

Method for accurate sonar orientation

针对声纳设备的实际应用,给出了基于实测基阵阵列流形的高分辨方位估计的方法。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,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有效可用。

In order to reduce the negative effect for DOA estimation （direction of arrival estimation） from strong interfering signals distributed over.the sea surface, low-sidelobe is needed when mult.ibeam is preformed in beam-space MUSIC. Due to ar-ray model mismatch between practical array manifold and ideal array manifold, expected sidelobe level can not be reached. Therefore, a new beam-space high resolution bearing estimation method is presented. The method adopts adaptive beam optimiza- tion based on measured a^ay 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 beam-pat-tern. Moreover, the method can be used for arbitrary geometry array. Anechoic rank experimental results show that better perfor-mance of direction estimation can be obtained with the proposed method.