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Phased-array transmitters for GPR surveys

机译：用于GPR测量的相控阵发射机

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The antennas commonly used in ground penetrating radar surveys have wide illumination, but limited spatial resolution. To overcome this limitation, we propose the use of phased-array transmitters, which allow us to direct the electromagnetic energy. We first perform a theoretical analysis to determine the influence of the number of antennas, the antenna spacing and the phase shifts between antennas. This analysis is useful to define the direction of the main lobe of the radiation pattern and its width. The simulations, which show the versatility of using phased arrays as compared to a single antenna, have been done to determine the best array parameters to image a given interface. On the basis of these simulations, we acquired common-receiver gathers with two single 100 MHz antennas to simulate a single survey involving 21 phase-shifted transmitter antennas and a single-receiver antenna. We have improved the signal-to-noise ratio, and the lateral coherence of the reflection events, and obtained a greater penetration depth as a consequence of the energy focusing.
机译：探地雷达勘测中常用的天线具有较宽的照度，但空间分辨率有限。为了克服这个限制，我们建议使用相控阵发射机，它可以引导电磁能。我们首先进行理论分析，以确定天线数量，天线间距和天线之间的相移的影响。该分析对于定义辐射图主瓣的方向及其宽度很有用。仿真已经显示出与单个天线相比使用相控阵的多功能性，已经完成了确定给定接口成像的最佳阵列参数的仿真。在这些模拟的基础上，我们获得了带有两个单100 MHz天线的公共接收器集合，以模拟涉及21个相移发射器天线和单个接收器天线的单次测量。我们提高了信噪比和反射事件的横向相干性，并且由于能量聚焦而获得了更大的穿透深度。

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