基于DDS和Taylor加权发射波束形成研究

Study on Implementation of Launch-DBF System Based on DDS and Weight of Taylor

提出了一种对水声换能器基阵的发射波束进行优化控制的方法。首先,根据Taylor加权的计算公式,计算出可获得低旁瓣波束各阵元的幅度加权系数;然后,应用直接数字频率合成(DDS)技术设计出每个阵元偏移一定相位的发射信号;最后,结合高性能现场可编程门阵列(FPGA)技术,设计了8元直线阵的发射波束形成。仿真计算和实验结果表明,文章设计的方法不仅能实现低旁瓣的发射波束,还能很精确地控制发射波束角度,为以后的实际工程实现提供了参考方案。

In order to control the amplitude and phase of the signal flexibility and precision,a new method about array of underwater acoustic transducers based on DBF is presented.Firstly,according to the Taylor weighting formula,the weights of Taylor of each array element are calculated.Then,DDS technology can generate transmitting signal of each array element,whose phase offset is different.Finally,the 8-element uniform linear array of launchDBF system is designed with high-performance FPGA chipset.The simulation and experimental results show that the method not only get low sidelobe transmitting beam,but also it is very accurate to control transmitting beam angle.The analysis about the feasibility in project is presented and some reference is provided for the designs.