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对捷联惯性制导系统弹载计算机四元数计算的舍入误差进行了概率估计。首先建立定点计算机上四元数计算舍入误差的概率模型，然后利用该模型得到舍入误差的分布函数，进行舍入误差的概率分析。
The probabilistic estimation of the rounding error of SINS SINS on-board computer quaternion is carried out. First of all, a probabilistic model of rounding error for fixed point computer is established, and then the distribution function of rounding error is obtained and the probability of rounding error is analyzed.