钻孔地质雷达天线收发信号数值模拟

为了解决钻孔地质雷达数值模拟中天线长度的影响,通过理论推导和数值计算研究天线中电流于电压的相互转换。对于发射的信号,首先根据激发的电压与的卷积得到天线中电流的分布,从而得到计算区域的电场;对于接收信号接收天线处的电场与卷积得到该无限小的天线电流强度,然后根据天线长度对其进行积分得到天线总电流的大小,与接收天线的负载电阻相乘即可得到该时刻接收到的电压大小。结果表明:接收信号波形与发射信号波形基本相同。证明了在考虑天线长度的前提下,根据文中算法得到的收发信号表达式是准确的。

Numerical Simulation Study on the Transmission and Receiving Signal of Borehole Radar Antenna

In order to solve the influence of antenna length on the numerical simulation of borehole ground penetrating radar, this paper studies the mutual conversion of current to voltage in the antenna through theoretical derivation and numerical calculation. For the transmitted signal, we first obtain the current distribution in the antenna according to the convolution of the excitation voltage and the electric field in the calculated area.For the electric field and convolution at the receiving antenna of the received signal, the infinitesimal current intensity of the antenna is obtained, and then the total current of the antenna is obtained by integrating the length of the antenna. The voltage received at that time can be obtained by multiplying the load resistance of the receiving antenna. The results of theoretical calculation and numerical simulation show that the received signal waveform is basically the same as the transmitted signal waveform. It is concluded that the expression of the received and received signals based on the proposed algorithm is accurate under the premise of considering the antenna length.