并以4台阶、8台阶、16台阶菲涅耳透镜为例，系统分析对准误差对衍射效率的影响并进行计算机模拟研究。

Taking 4 step and 8 step and 16 step Fresnel lens for example, the effect of alignment error on diffractive efficiency is analyzed systematically and simulated by computer.

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理论分析结果表明，两位置对准可以提高系统状态变量的可观测度，尤其对加速度计误差和方位失准角的可观测度提高作用明显。

Theory analysis showed that the method of two-position alignment increases the observability degree of state variables, especially for the error of accelerometer and azimuth misalignment.

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同时，对系统初始对准的误差进行了分析。

And analyse the deviation of initial alignment.

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