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本文研讨了一种地下雷达,这种雷达采用甚高频带频谱的6毫微秒单周期脉冲。它可以从地面上以不接触的方式探测地下,通过天线扫描,以彩色图象显示大地的断面图象。 本文讨论了这种地下雷达的探测能力,给出了利用样机得到的实验结果。首先就(日本)关东垆坶层(富士山火山灰风化的壤土层)进行了脉冲波的地下透射实验,所得结果是,传播速度约为大气中的1/6(5.4厘米/毫微秒)。其次,利用这种地下雷达探测了地下钢管(直径10厘米),深度不超过3米时,可以显示出清晰的图象。另外,由实验结果得知,大地表减率约为6分贝/米。还指出,即使钢管埋在柏油路面下,也可加以探测。这些雷达图象中的噪声和杂波信号,可用简单的信号处理电路予以滤除。最后介绍这样一种方法:即使在大地电常数未知的情况下,利用它也可算出目标的位置、深度和脉冲波的地下传播速度。
This article examines an underground radar that uses a 6 nanosecond single-cycle pulse in the very high-band spectrum. It can detect the ground from the ground in a non-contact manner, through the antenna scanning, the color image shows the earth’s cross-section image. This paper discusses the detection capability of this underground radar and gives the experimental results obtained by using the prototype. First, a ground-penetrating pulse-wave experiment was conducted on the Tamagotchi (Mt. Fuji volcanic ash-weathered loamy soil layer) in Japan (Japan). As a result, the propagation velocity was about 1/6 (5.4 cm / nanosecond) in the atmosphere. Secondly, underground steel pipes (10 cm in diameter) were probed using this underground radar and showed clear images at depths up to 3 meters. In addition, the experimental results show that the reduction rate of the earth’s surface is about 6 dB / m. Also pointed out that even if the pipe buried under the asphalt pavement, can also be detected. The noise and clutter signals in these radar images can be filtered out using simple signal processing circuits. Finally, we introduce a method that can be used to calculate the target’s position, depth and the propagation velocity of the pulse wave even when the geoelectric constant is unknown.