基于FPGA的相控超声发射系统设计与实现

Design and Implementation of FPGA-based Ultrasound Phased Transmission System

摘要:

设计了一种以FPGA为核心的相控超声发射系统,对该系统工作原理及相控聚焦方法进行了研究;设计了一种二维相控阵列,并进行了阵列定点聚焦延时仿真；最后运用该系统实现了对相控阵列的高精度聚焦延时控制,并经过DA转换、电压及功率放大,产生了幅值及波形可控的激励信号,测试了该系统对实际目标的定位精度；实验结果显示对实际目标定位偏差在3%左右,该超声相控发射系统可实现相控聚焦发射,延时控制精度高,可靠性好。

Abstract:

An ultrasound phased transmission system is designed based on FPGA in this paper. The operating principle of phased array focusing transmission is studied. A 2D phased array is designed and the focus time line of the array is simulated. Finally the focusing time line of the phased array is accomplished using the transmission system with high accuracy. Through AD conversion and amplification of voltage and power, an excitation signal is generated, of which the amplitude and wave shape are variable. Then the location of actual targets is measured using the phased array and the transmission system. Result shows a good accuracy with small location deviation of about 3%. This phased ultrasound transmission system can realize phased focusing transmission with high reliability and accuracy of time-delay control.