非均匀介质中瞬态信号传播位置的确定
Locating where Transient Signals Travel in Inhomogeneous Media
摘要：
定位瞬态信号在源和接收器之间传播的位置需要最后一步，这是在使用诸如亥姆霍兹和基尔霍夫积分定理的衍射理论之后所需要的。这里介绍的，最后一步帐户的相位屏幕上的相邻孔径之间的干扰，通过自适应地调整它们的相位和幅度，产生一个层次的能量贡献的任何所需的窗口的信号传播时间在接收机。该方法允许在有限波长下检查射线理论中的错误。海洋波导中的远距离声传播（50-100 Hz，0.05 s分辨率）与射线理论有很大的偏差。海洋表面零压力的边界条件似乎导致声音在接近表面的距离上以接近水平的轨迹传播，比射线预测的要远得多。第一菲涅尔区是不适当的尺度，以表征瞬态声音在标准散射理论假设的射线路径附近传播的位置。相反，菲涅尔区是太大了一个数量级的情况下，在这里研究。声音传播的区域可能具有复杂的结构，而不符合简单的长度尺度。这些结果适用于水声物理、光学、无线电通信、雷达、电子物理和波散射理论。
英文摘要：
Locating where transient signals travel between a source and receiver requires a final step that is needed after using a theory of diffraction such as the integral theorem of Helmholtz and Kirchhoff. Introduced here, the final step accounts for interference between adjacent apertures on a phase screen by adaptively adjusting their phase and amplitude, yielding a hierarchy of energy contributions to any desired window of signal travel time at the receiver. The method allows one to check errors in ray theory at finite wavelengths. Acoustic propagation at long distance in the oceanic waveguide (50-100 Hz, 0.05 s resolution) has significant deviations from ray theory. The boundary condition of zero pressure at the surface of the ocean appears to cause sound to travel in a nearly horizontal trajectory for a much greater distance near the surface than predicted by rays. The first Fresnel zone is an inappropriate scale to characterize where transient sounds travel near a ray path as assumed by a standard scattering theory. Instead, the Fresnel zone is too large by an order of magnitude for cases investigated here. Regions where sounds travel can have complicated structures defying a simple length scale. These results are applicable to the physics of underwater sound, optics, radio communication, radar, geophysics, and theories of wave-scattering.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
