基于FPGA的超声波信号处理研究

Research on Signal Processing of Ultrasonic Waves Based on FPGA

从超声探伤系统结构入手,有限脉冲响应(FIR)数字滤波器的结构特点和基本原理得以分析。为了降低超声波检测过程中噪声对检测精度的影响,提出了利用FPGA来实现数字信号的处理,运用分布式算法(DA)来实现FIR滤波器。随着变量的位数增加,运用了并行式的分布算法,减少了FPGA硬件资源的耗费。仿真结果表明,消噪效果良好,信号的处理效率得到了提高。

From research on the structure of ultrasonic flaw detection system, the structural characteristics and basic principles of FIR filter was under analysis. In order to lessen the impact on detection accuracy from noise in the ultrasonic detecting process, FPGA was utilized to achieve the digital signal processing, and the distributed algorithm（DA） was to achieve the FIR filter. With the increase of the number of variables, the parallel algorithm came into use, and the resources that the FPGA hardware costs decreased. The results of simulation show that the noise was lowered remarkably, and the processing efficiency of the signal was improved.