本文提出了一种复合数字滤波方法及基于最小二乘原理的直线拟合方法，用于实现火炮接口参数检测系统的滤波和线性度拟合。
A compound digital filtering method and a line fitting method based on the least squares are presented, which are used in the measurement system of interface parameters of artillery.
采用最小二乘估计法对试验数据进行了拟合，得到了回归直线，并分析了不同电流下激光管的失效机制。
Least-square principle method was used to process experimental data and the regression line obtained. The failure mechanism of the He-Ne laser tube under different current has been analyzed.
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