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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。
A brief introduction to the method of acquiring data pair of {xi, ti} during underwater bullet movement is given. The difference between the projectile movement in the air and the air is analyzed. A displacement - time regression model suitable for the projectile motion in water is proposed. The calculation method of the standard error of projectile motion velocity is discussed and the variation rule of standard error is given.