提出两个关系，即进动周期—绝对星等的关系和黑洞质量—进动锥角的关系；
Two correlations have been raised and sustained by observational values, which are precession period - absolute magnitude correlation and black hole mass - precession cone semi-angle correlation;
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。
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.
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。
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.
由于进动周期的上下限之比通常大于2，因此该方法的计算量比自相关法增大的倍数小于1.4；同时它对先验信息的要求非常宽松。
Usually the ratio of the upper bound to the lower bound is larger than 2, resulting in the computational burden of the proposed method less than 1.4 times of that of the autocorrelation method.
一个例子是周期运动，如一个带有自旋和磁矩的粒子在恒定磁场中的进动。
An example is periodic motion, such as the precession of a particle with intrinsic spin and magnetic moment in a constant magnetic field.
一个例子是周期运动，如一个带有自旋和磁矩的粒子在恒定磁场中的进动。
An example is periodic motion, such as the precession of a particle with intrinsic spin and magnetic moment in a constant magnetic field.
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