Finite difference method in frequency-space domain caus-es convenient operation, good stability and satisfactory adaptability to vertical andlateral velocity variations; however it results in poor image accuracy and slow oper-ation.

• 频率、空间域的有限差分算法简单、稳定性好、能适应速度的纵、横向变化，但成像精度低、运算速度慢；