高集成度水声相控阵发射系统设计

Design of High Integration Underwater Acoustic Phased Array Transmitting System

针对水声成像系统体积小、电源电压低的特点,设计了一种基于相控阵技术的高集成度水声发射电路。通过运用FPGA产生脉冲激励信号并设计相控延时,实现了16通道激励脉冲信号的相控发射。设计了发射信号运算放大和功率放大电路,有效提高了发射信号的幅值和功率。实验结果表明,该系统可以产生高频高压的激励脉冲信号,实现最小2 ns的相控延时,实际测试时能够得到较强的回波信号,为水声成像系统的研究提供了硬件基础。

In order to enhance the characteristics of underwater acoustic imaging system with small volume ,low power supply voltage,a high integration underwater acoustic transmitting circuit based on phased array is designed. Using FPGA to control the excitation signals delay time of 16 channels to achieve phased transmitting. Then the operational amplifier and power amplifier circuit are designed and effectively improve the amplitude and power of the transmitted signals. The experimental results show that,the design can generate the excitation pulse signals with high frequency and high voltage,achieve phase delay time to the minimum 2.5 ns. The actual test shows a strong echo signal. It provides a hardware foundation for the research of underwater acoustic imaging system.