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。
The paper is concerned with the improvement of old portable data acquisition instrument, which contains the program migration, the design of USB transmission and noise analysis modules.
本论文主要是对原先的便携式数据采集仪进行改进，先进行程序移植，然后完成了USB通讯和噪声分析这两个模块的设计。
The paper is concerned with the improvement of old portable data acquisition instrument, which contains the program migration, the design of USB transmission and noise analysis modules.
本论文主要是对原先的便携式数据采集仪进行改进，先进行程序移植，然后完成了USB通讯和噪声分析这两个模块的设计。
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