The higher orders were retained as an infinite sum of standing eigen-waves to deal with the fields inside the grooves. 其中对槽区内的场处理,保留其高次项,表示为一无限本征驻波之和的形式。
We propose adding a term that is related to the fourth power of offset into the traveltime equation, and expressed it by a fraction expansion. 为此,在时距关系中增加含炮检距的四次项,并采用分式展开法表示该四次项,同时引入远偏移距收敛因子。