DMCA 中基于补偿最小二乘法的基线估计算法

摘要

介绍了一种用于数字化多道脉冲幅度分析（ DMCA）中的基线估计算法。该算法针对核脉冲信号尾部衰减很慢的特点，首先对核脉冲信号死时间内的信号作直线替代预处理，以减小核脉冲信号尾部对基线估计的影响，然后用补偿最小二乘法对预处理后的信号进行拟合，从而估计出基线。仿真结果表明，本文算法估计出的基线平滑稳定，能够很好的逼近真实基线。通过与常规算法估计结果的均方误差作对比，得出本文算法具有更高的基线估计精度。%This paper introduces a baseline estimation algorithm applied in Digital Multi -Channel Analyzer (DMCA).As the tail of nuclear pulse signal decays rather slowly , firstly, we replace the dead time period of nuclear signal with a straight line to reduce the influence of signal 's tail on baseline estimation .Secondly , the preprocessed signal is fitted with Penalized Least Squares method and then the estimated baseline is obtained . Simulation results show that the estimated baseline obtained by the proposed algorithm is smooth and stable , and it approaches the real baseline very well .Through its MSE comparison with the general algorithm , the proposed algorithm has better accuracy performance in baseline estimation .