均匀线列阵时域宽带波束形成方法研究

A Constant Width Beamfoming Method for Linear Unitary Array

时域宽带恒定束宽波束形成技术一般采用特殊频率响应的FIR滤波器组实现对不同频率的加权。对水下常用的均匀线列阵,利用切比雪夫方法设计了形成宽带恒定束宽波束的权值。通过对切比雪夫方法设计权值特性的分析,推导出实现加权的FIR滤波器组的相位响应关系式。根据推导结果得出设计的FIR滤波器组应为一组斜率不同的线性相位响应FIR滤波器。推导了滤波器组相位响应的计算公式。给出三种特殊频率响应FIR滤波器设计算法。通过仿真结果比较了三种方法设计的用于实现均匀线列阵恒定束宽加权的FIR滤波器组的性能。

For the linear unitary array, the wideband constant width beam weights can be calculated by Chebyshey algorithm. The weights are realized by special designed FIR digital filters. Through the analysis of the constant width beam weights, the desired FIR filters can be a set of linear phase response FIR filters. The formulation defining the phase response of each desired filter is deduced. Three different methods which can design special frequency response filter are also given. Computer simulation is done based on a linear unitary array composed of 11 sensors in order to testify the capability of the given filter design methods.