基于FDTD的空间步进频雷达煤层异质区探测正演分析  被引量:1

Forward simulation of FDTD-based coal seam heterogeneous area detection by spatial stepping frequency radar

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作  者:贺顺[1] 罗彩祯 杨志伟[2] 贾远航 HE Shun;LUO Caizhen;YANG Zhiwei;JIA Yuanhang(Communication and Information Engineering College,Xi’an University of Science and Technology,Xi’an 710054,China;National Key Lab of Radar Signal Processing,Xidian University,Xi’an 710071,China)

机构地区:[1]西安科技大学通信与信息工程学院,陕西西安710054 [2]西安电子科技大学雷达信号处理重点实验室,陕西西安710071

出  处:《现代电子技术》2022年第1期1-6,共6页Modern Electronics Technique

基  金:国家自然科学基金资助项目(61801373);西安科技大学博士(后)启动金项目(2017QDJ018)“;认知无线电与信息处理”教育部重点实验室2016年开放基金项目(CRKL160206)资助。

摘  要:针对传统井下单发单收探测雷达存在的探测分辨率低、获取数据信息量少的问题,提出将多输入多输出体制下的空间步进频雷达用于井下探测。采用时域有限差分的方法,通过设置发射天线将空间步进频信号引入计算空间,结合采空区、富水区、薄泥岩层三种异质区模型,利用时间迭代的方式求解信号在模型空间的正演结果。仿真结果表明,采空区与薄泥岩层均表现为二次反射,但采空区的回波更强,富水区仅表现为一次反射,信号在富水区的衰减最为迅速,泥岩次之,采空区的衰减最小。该研究对后续空间步进频雷达用于井下实际探测提供了一定的参考。In view of the low detection resolution and insufficient data information acquired by the traditional single-sending and single-receiving underground coal mine detection radar,a spatial stepping frequency radar with the multiple-input multipleoutput system is proposed for underground coal mine detection. In this paper,the finite-difference time-domain(FDTD)method is adopted to introduce the spatial stepping frequency signal into the computational space by setting the transmitting antenna,and the manner of time iteration is used to solve the forward modeling result of the signal in the model space by combining the three heterogeneous models of goaf,rich water area and thin mudstone layer. The simulation results show that both the goaf and the thin mudstone layer express secondary reflection(the echo of goaf is stronger),while the rich water area expresses only primary reflection. The signal attenuation is the most rapid in the rich water area,followed by the thin mudstone layer and the goaf in sequence. In addition,this study provides a certain reference for the following underground detection by the spatial stepping frequency radar.

关 键 词:正演模拟 煤层异质区 空间步进频 FDTD 地质预测 井下探测 空间步进频雷达 

分 类 号:TN953.2-34[电子电信—信号与信息处理]

 

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