It is concluded that the RCS of target is related to its geometry size and the wavelength of incidence wave.
通过对复杂目标近远场电磁散射理论模型的分析得到，目标的雷达截面和目标的几何尺寸及工作波长有关系。
When the incidence wave is strong enough, the contact interface will separate or slide on local area, which is harmful to the safety of the structure.
当扰动很强时，会引起接触界面的局部滑移和分离，对结构安全产生威胁。
The noise-extracted signal which is reconstructed by the revised wavelet coefficient could clearly reflect the time difference between incidence wave and reflection wave.
经过修正后的小波系数重构得到的信号图能够消去大部分噪声，清晰地反映入射波和反射波之间的时差。
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