The method is improved by constructing corresponding quasi-Newton iterate formula and introducing control threshold which manages the choice of algorithm during the course of iterating inversion.

• 本文对这种方法进行了改进,构造出相应的正则-拟牛顿型迭代公式,并通过引入控制阈值来控制迭代反演过程中反演算法的选取,从而构造了单尺度上的自由选择公式的方法。