The difference function between the ACF and the convex hull is obtained, and then the precession period is estimated by searching for the maximum value of the difference function.

首先求出acf和其凸包的差函数，然后搜索差函数的最大值，从而得到进动周期的估计值。

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However, the lower bound of the precession period provided may be far less than the true precession period, which will seriously degrade the estimation performance.

进动周期下限可能远小于真实进动周期，此时自相关法的估计性能将严重下降。

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