数字高斯脉冲成形算法仿真研究

高斯脉冲具有良好的时间、频率响应和较高的信噪比,探测器输出信号通常被滤波成形为高斯波形或类高斯波形。在高斯脉冲成形算法基础上,引入截止频率和品质因子,讨论成形参数对成形脉冲幅度、宽度的影响。通过与梯形脉冲成形算法对比,研究高斯脉冲成形算法的滤波效果以及对核信号幅度谱的作用。结果表明,在相同达峰时间条件下高斯脉冲成形算法具有更好的噪声抑制能力,同时可减小核信号幅度谱的半高宽;结合使用梯形脉冲成形算法可改善高斯脉冲成形算法在处理堆积脉冲中的不足,提高核信号通过率。

Simulation study on Gaussian pulse shaping algorithm

Background:The Gaussian pulse possesses the advantages of time response, frequency response and signal-to-noise ratio (SNR), thereby nuclear signal is usually shaped to Gaussian or Semi-Gaussian pulse shape. Purpose:This work aims to simulation study on Gaussian pulse shaping algorithm and discuss the influence of shaping parameters on the amplitude and width of the shaped pulse.Methods:The cutoff frequency and quantify factor are introduced into Gaussian pulse shaping algorithm. The filtering performance of the algorithm and its effects on amplitude spectrum are evaluated and compared with the trapezoidal pulse shaping algorithm.Results:The simulation results suggest that Gaussian pulse shaping algorithm has better performance than trapezoidal pulse shaping algorithm in filtering when the peaking times of the shaped pulses are equal. Also, Gaussian pulse shaping algorithm can reduce the full width at half maximum (FWHM) of nuclear signal amplitude spectrum.Conclusion:Combined with the trapezoidal pulse shaping algorithm, the defect of Gaussian pulse shaping algorithm in pile-up pulse separation can be improved to increase output stream of nuclear signal.