On the base of the earth polar-axis, through discrete Fourier analysis of the value of one circuit electric current, the parameters of the error model are estimated by the corresponding calculation.

• 该方法以地球极轴为基准，通过对一周过程的电流值进行离散傅立叶分析，经过相应的运算处理求出误差模型参数的估计值。