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提出一种用于水声通信中的基于复数系数有限冲激响应(FIR)滤波器的宽带恒定束宽波束形成结构。其中,各阵元接收信号首先通过时间延迟线补偿整数倍采样间隔时延,接着通过频带搬移得到接收信号的复包络,最后采用复数系数FIR滤波器实现对不同频率信号复包络的加权,复数系数FIR滤波器的系数由最优化方法设计得到。仿真结果表明:采用基于复数系数FIR滤波器的宽带恒定束宽波束形成结构,在通信带宽与载波频率的比值约为0.85时,设计得到的宽带波束与期望值间的最大误差小于0.3 dB.
A wideband constant beamwidth beamforming structure based on Complex Coefficient Finite Impulse Response (FIR) filter for underwater acoustic communication is proposed. The received signal of each array element first compensates for the integer multiple sampling interval delay through the time delay line and then the complex envelope of the received signal is obtained by band shifting. Finally, the complex coefficient FIR filter is used to weight the complex envelope of different frequency signals, The coefficient of the complex coefficient FIR filter is designed by the optimization method. The simulation results show that the wideband constant beamwidth beamforming structure based on the complex coefficient FIR filter is less than 0.3 dB when the ratio of the communication bandwidth to the carrier frequency is about 0.85, and the maximum error between the designed wideband beam and the expected value is less than 0.3 dB.