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本文在给出Debye型色散媒质中2．5维时域有限差分法（2．5D－FDTD法）迭代公式的基础上，对无载频脉冲波在不同色散媒质中的传播特性进行了计算，分析了脉冲产生畸变的原因，并提出对部分畸变脉冲进行整形的方法。分别对地下单体目标和群体目标的雷达回波电平图进行了模拟计算，并与实际无载频脉冲探地雷达的探测结果进行比较，二者有较好的一致性，证实了本文所给计算公式的正确性。另外，还分析了土壤参数对雷达探测深度和分辨率的影响。
Based on the 2.5D FDTD iterative formula in Debye-type dispersion medium, the propagation characteristics of no-carrier pulse wave in different dispersion media are calculated. The reason of the distortion of the pulse is analyzed, and the method of shaping the part of the distortion pulse is proposed. The radar echogram of underground single target and group target are simulated respectively and compared with the actual non-carrier frequency pulse ground penetrating radar detection results. The two are in good agreement, which confirms that this article To calculate the correctness of the formula. In addition, the influence of soil parameters on radar detection depth and resolution is also analyzed.