Reversal point method which is adopted by gyroscope to seek north at present reduces the speed of north-seeking and is hard to make the instrument automatic.
目前陀螺初寻北大多还是采用逆转点法，影响寻北速度且难以实现仪器自动化。
Based on the focalization ability of time reversal theory to the wave origin, the wave propagation was rebuilt by an image method which displays the damage as the focusing point.
利用时间反转法对波源的自适应聚焦能力，重建信号传播波动图，通过信号聚焦显示损伤位置和区域。
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