水下枪弹速度测量误差分析

Analysing the Error in the Bullet Velocity Measurement under Water

简要介绍了水下枪弹运动时｛ｘｉ，ｔｉ｝ 数据对的获取方法。分析了弹丸在水中与空气中运动规律的差异，提出了适合于水中弹丸运动的位移—时间回归模型。讨论了弹丸运动速度之标准误差的计算方法，并给出了标准误差之变化规律。

The paper briefly introduces the measurement method for the velocity of bullet under water and the capture method for { x i,t i } data couple and analyses the difference of the law to the bullet movement between in the air and in the water. A displacement time regression model suited to the bullet movement in water is introduced. In order to correctly reflect the anticipated error of the velocity, this paper discusses the calculation method which can judge the standard error of the bullet movement velocity under water, and introduces the fluctuation regulation to the standard error of the bullet velocity.