| 摘要 |
<p>An underground radar tomography method or apparatus. An electromagnetic wave is emitted into the ground, and the amplitude and propagation time delay of transmitted waves, reflected waves and diffracted waves are detected at a large number of points. The detected signals are processed to obtain high precision data of the distribution of underground layers and soil quality as tomographic data. Two pseudo-random signals having the same code pattern with their periods being a little bit different to obtain a measuring time which is expanded with respect to the propagation time, so that accuracy is improved.</p> |
