测量多弹道要求对飞行弹丸进行跟踪，利用卡耳曼滤波方法和最小二来外推方法都能达到跟踪滤波的目的．本文分别推导出用这两种方法滤波的方程，并通过仿真对二者的效果进行比较． The measurement of multi-ballistic requirements of the flight projectile tracking, using the Kalman filtering method and least two extrapolation methods can achieve the purpose of tracking filter. In this paper, the equations filtered by these two methods are deduced respectively, and their effects are compared by simulation.