一种用于核辐射探测的数字滤波器优化设计方法

Digital filter optimized design method for nuclear radiation detection

Abstract

The invention provides a digital filter optimized design method for nuclear radiation detection. An existing average or weighted average process is taken as the result of measuring obtained waiting time through an FIR filter; the waiting time is processed by adopting an IIR filter instead of existing average or weighted average; optimized design is carried out to the coefficients [a1, a2, and the like, aq] and [b0, b1, b2, and the like, bq] of the IIR filter through a particle swarm optimization algorithm; the designed IIR filter has the fastest response speed under a certain measuring precision (characterized by the noise gain of the filter) condition. According to the method provided by the invention, the noise gain of the filter can be appointed according to demands; a measuring error is controlled; compared with the conventional average or weighted average algorithm, the optimally designed filter has little calculation quantity under the same noise gain condition and has faster response speed.
本发明提供一种用于核辐射探测的数字滤波器优化设计方法,将现有的平均或加权平均过程看作测量所得等待时间通过FIR滤波器的结果,并采用IIR滤波器代替现有的平均或加权平均处理等待时间,通过粒子群优化算法对IIR滤波器的系数[a1,a2,…,aq]、[b0,b1,b2,…,bq]进行优化设计,使设计的IIR滤波器在一定测量精度(由滤波器噪声增益表征)条件下,具有最快的响应速度。该方法可根据需要指定滤波器的噪声增益,控制测量误差,优化设计出的滤波器与传统平均或加权平均算法相比,在相同噪声增益情况计算量很小,且具有更快的响应速度。

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