A concave-upward, semicircular event in seismic data that has the appearance of a smile and can be caused by poor data migration or migration of noise.
地震剖面上一个向上凹的、半圆形的同相轴，看上去象是微笑的样子，这是由于对含噪音数据或质量差的数据进行偏移引起的。
When signals are plus noise, the paper presents adaptive migration algorithm of two linear hybrid system.
针对信号中有加性噪声的情况，提出两类线性混合系统的自适应偏移算法。
It has been proved that this method of migration has a lot of merits - high signal to noise ratio, no arc noise of migration and the high speed of calculation.
实线证明这种偏移具有讯噪比高、无偏移弧噪声和运算速度高等特点。
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