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基于GprMax的地下冬笋正演模拟研究

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DOI:10.3969/j.issn.1672-3872.2023.16.017

作者:余铖,周凯琪,于航,温春雨,樊梦成,杨科成(浙江农林大学光机电工程学院,浙江 杭州 311300)

 

摘 要:【目的】探地雷达运用在冬笋探测上有分辨率高和抗干扰能力强的优势,但解译难度较大。通过正演模拟可以降低雷达图像解译的难度,减少实测成本,为探地雷达在冬笋探测领域的应用提供经验。【方法】研究小组利用GprMax软件对不同形状干扰介质、不同大小及不同埋藏深度的冬笋等模型进行了正演模拟,并进行了模型间的对比。【结果】正演模拟的图像能较好地反映出各不同模型的成像特征,能有效反馈介质模型的物理特性如大小、形状、深度等:1)截面形状不同的物体的双曲线回波形状不同;2)双曲线的上下界面距离反映出物体的大小,冬笋的长度越长,则上下界面的双曲线间隔距离越大;3)顶点位置反映出介质的埋藏深度,埋藏越深的冬笋,双曲线出现时间越晚、开口越大,埋藏越浅的冬笋则相反。【结论】通过分析这些特征,可以有效探测识别出地下冬笋的存在、生长时期(大小)与埋藏深度。该方法具有较高的准确度,有利于实测图像的解译与分析,也证实了探地雷达在冬笋探测领域的可行性。

关键词:探地雷达;冬笋探测;GprMax;正演模拟

 
Research on Forward Simulation of Underground Winter Bamboo Shoots Based on GprMax
Author: Yu Cheng, Zhou Kaiqi, Yu Hang, Wen Chunyu, Fan Mengcheng, Yang Kecheng
(College of Optoelectronic Engineering, Zhejiang A&F University, Zhejiang Hangzhou 311300)

 

Abstract: [Objective] Ground penetrating radar has the advantages of high resolution and strong anti-interference ability in detecting winter bamboo shoots, but it is difficult to interpret. Through forward simulation, the difficulty of radar image interpretation can be reduced, and the actual measurement cost can be reduced, providing experience for the application of ground penetrating radar in the field of winter bamboo shoot detection. [Method] This research group uesd GprMax software to conduct forward simulation on models of winter bamboo shoots with different shapes of interference media, sizes, and burial depths, and compared the models. [Result] The forward simulated images can better reflect the imaging characteristics of different models and effectively feedback the physical characteristics of the medium model, such as size, shape, depth, etc. 1) The hyperbola echo shapes of objects with different cross section shapes are different. 2) The distance between the upper and lower interfaces of the hyperbola reflects the size of the object. The longer the length of the winter bamboo shoots, the greater the distance between the upper and lower interfaces of the hyperbola. 3) The vertex position reflects the burial depth of the medium. The deeper the burial depth of the winter bamboo shoots, the later the hyperbola appears and the larger the opening, while the shallower the burial depth of the winter bamboo shoots is the opposite. [Conclusion] By analyzing these features, the existence, growth period (size), and burial depth of underground winter bamboo shoots can be effectively detected and identified. This method has high accuracy, which is conducive to the interpretation and analysis of measured images, and also confirms the feasibility of ground penetrating radar in the field of winter bamboo shoot detection.

Keywords: GPR; winter bamboo shoot detection; GprMax; forward simulation

 

引文信息 [1]余铖,周凯琪,于航,等.基于GprMax的地下冬笋正演模拟研究[J].南方农机,2023,54(16):63-65+103.

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