af-x explicit migration is carried out through spatial convolution of finite-length extrapolation operator with frequency slice, which is concise, high efficient, and easy to extend from 2d to 3d.
频率空间域显式偏移利用有限长度的褶积算子,通过对不同的频率进行空间褶积来实现偏移成像,且具有简洁、高效、便于扩展等特点。