【Key words】 rocket； missile； trajectory disturbance factors； flight deviation； strap down inertial system；
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分析表明，在自由飞行段5点测高可以估出落点偏差。
Analyses show that a measurement of 5 points altitude in the free flight path, the impact position error may be estimated probably.
本文提出了一种有效的飞行仪器偏差估计的极大似然方法。
An efficient maximum likelihood method for the estimation of instrumentation errors for flight is presented.
推导了根据落点偏差求飞行程序角和发射方位角的牛顿迭代公式，设计了迭代算法，并给出了实际算例。
In this paper, Newton iterative formula based on deviations of dropping point is deduced and the iterative program is designed, an example is given.
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