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为准确分析路基下不同目标体的路面雷达电磁波回波特性,采用二维时域有限差分方法(2D-FDTD),对路基金属及空洞目标体的路面雷达电磁波进行了正演模拟,分析了路基媒质的介电常数、目标体的埋深、形状等对路面雷达反射波的影响.在目标体周围路基介质介电常数为非均匀分布情况下,对该实验正演模拟结果与实测结果进行对比,结果表明,模拟结果与实测结果吻合较好,验证了该正演模拟方法的正确性.
In order to accurately analyze the electromagnetic wave characteristics of pavement radar with subgrade under different subgrade, the two-dimensional finite difference time domain method (2D-FDTD) was used to simulate the electromagnetic wave of pavement radar of subgrade and metal target. The influence of the dielectric constant of subgrade media, the depth of object, the shape and so on on the reflected wave of pavement radar.When the dielectric constant of subgrade media around the target is non-uniform, the simulation results and the measured results of the experiment are carried out The results show that the simulation results are in good agreement with the measured results, which proves the correctness of the forward modeling method.