摘要
利用超宽带探地雷达技术,以及衍射层析成像算法实现对根系的探测与成像。通过时域有限差分法,对树木根系进行建模仿真,生成探地雷达扫描数据,然后利用衍射层析成像算法对仿真数据进行目标重建,得到根系横截面反演图像。并讨论了根的直径、介电特性及其分布情况对探地雷达探测根系的影响。仿真结果表明,在近似为无损的均匀土壤中,超宽带探地雷达能快速无损地实现地下根系目标探测,衍射层技术通过重建根系图像,初步实现树根的介电属性、形状特征估计和位置标定等,因而可用于探地雷达根系探测中,对树木根系的研究具有重要意义。
Diffraction tomography（DT） algorithm is derived for the detection and imaging of tree roots using ultra-wide band（UWB） ground penetrate radar（GPR） technique.A mathematical analysis model of the root in soil was built based on the finite difference time domain（FDTD） to obtain the GPR data.And the DT algorithm was used to reconstruct cross-sectional image of root.Limiting factors in the detection and reconstruction of roots,such as root diameter,permittivity and intervals were also discussed in the paper.The simulation results showed that,in nearly lossless homogeneous soil,UWB GPR combining with DT algorithm leaded to a rapid and accurate reconstruction of root′s position,shape and permittivity.
出处
《中国农业科技导报》
CAS
CSCD
2011年第1期129-136,共8页
Journal of Agricultural Science and Technology
基金
国家863计划项目(2008AA10Z205)资助
关键词
探地雷达
衍射层析成像算法
根系探测
ground penetrating radar（GPR）
diffraction tomography（DT）
root detection
