核信号的FIR数字滤波模拟计算  

Simulation and Calculation of Nuclear Signal Based on FIR Digital Filter

作　　者：胡云川[1] 周建斌[1] 洪旭[1] 万新峰[1] 杜鑫[1] 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059

出　　处：《核电子学与探测技术》2014年第12期1425-1427,1437,共4页Nuclear Electronics & Detection Technology

基　　金：863计划资助项目(2012AA061804)资助

摘　　要：通过对模拟核脉冲信号进行离散傅里叶变换,根据得到的频率响应特性,构建最小二乘FIR数字滤波器。运用80MHz高速流水型ADC实时采样的核脉冲信号经过构建FIR滤波器后,噪声得到明显的抑制,输出信号更加平滑,信噪比(SNR)明显提高。采用不同方法对137Cs采样的实时脉冲信号进行滤波处理,其最小二乘FIR滤波器效果最佳。A digital FIR filter based on least-square method is put forward by Fourier transform in this paper.For ^137 Cs source,when sampling signal from 80 MSPS ADC passes through designed FIR filter,output signal will be smoothed and SNR（ signal to noise ratio） will be improved. The result shows that digital FIR filter has much better performance for filter processing in comparison with the 5 point least square moving average filter.

关 键 词：核脉冲信号 FIR数字滤波器 最小二乘法 

分 类 号：TL82[核科学技术—核技术及应用]