Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Ground penetrating radar large-scale three-dimensional forward modeling method based on FDTD

A forward modeling, ground penetrating radar technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problems of long calculation time, inability to calculate, long calculation time, etc. cost loss, improved reliability, and the effect of facilitating interpretation

Active Publication Date: 2014-08-06
苏州市数字城市工程研究中心有限公司
View PDF2 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the calculation space is three-dimensional and the scale is much larger than the wavelength (that is, the electric large scale), the required storage space is completely beyond the limit of the current stand-alone computer, making the calculation impossible; secondly, to obtain a stable numerical solution for the FDTD method, the time step must satisfy , that is, the Courant stability condition, which leads to a very long calculation time for a single survey point of GPR in 3D; Calculate the complete radar wave process of each measuring point in turn. When the measuring points are densely distributed and the number is large, the calculation time required is extremely long, or even impossible to calculate
Therefore, at present, only small-scale simulations can be carried out, and there is nothing that can be done for large-scale and large-scale forward simulations.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Ground penetrating radar large-scale three-dimensional forward modeling method based on FDTD
  • Ground penetrating radar large-scale three-dimensional forward modeling method based on FDTD
  • Ground penetrating radar large-scale three-dimensional forward modeling method based on FDTD

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0031] The preferred embodiment of the present invention will be described in detail below in conjunction with accompanying drawing:

[0032] figure 1The whole three-dimensional forward modeling parallel calculation flow chart of the present invention is given. First, the target space is discretized to form multiple nodes, and multiple measuring points are set on each node according to the accuracy requirements; the MPI parallel environment is initialized, the node topology is established, the size of the communication group is determined, and the ID of the current node is obtained. Set up, allocate memory space, and initialize various physical quantities for forward modeling. Then set the calculation domain size, grid accuracy, total time step, antenna parameters, geoelectric model, underground medium model, etc. according to the forward modeling requirements, and calculate the required intermediate data such as time step and space step according to these parameters. After ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a ground penetrating radar large-scale three-dimensional forward modeling method based on the FDTD. According to the method, data exchange of nodes is carried out through a network, and communication and synchronization of the nodes are achieved; a measured point in any node is selected to be subjected to forward modeling parallel calculation on the basis of the FDTD, firstly, an electric field value is calculated, magnetic field calculation is carried out by adding an excitation source after electric field calculation is finished, iteration is continuously carried out through communication, electric field calculation and magnetic field calculation, and when calculation of the set time total step length is finished, calculation is stopped, output data are stored, the data serve as a radar reflected signal of the measured point; initialization updating is carried out on all field values, a whole computational domain recovers to the state before calculation, and then a transmitting antenna and a receiving antenna are moved to a next measured point to start forward modeling calculation again; if calculation of all the measured points is finished, data of all the nodes are collected to carry out imaging and image postprocessing. The ground penetrating radar large-scale three-dimensional forward modeling method based on the FDTD is applicable to calculation of dielectrics and models with complex scales, has the advantage of being high in universality, and is especially applicable to large-scale and high-precision forward modeling.

Description

technical field [0001] The invention relates to a ground-penetrating radar forward modeling simulation method used as a ground-penetrating radar theoretical research means. Background technique [0002] The Ground Penetrating Radar (GPR) method is a spectral (1MHz-1GHz) electromagnetic wave technique used to determine the distribution of underground media. Ground-penetrating radar is a relatively new geophysical method that has gradually matured in the past 10 years. The development of ground penetrating radar is not only accompanied by various military and civilian needs, but also promoted by the development of high technology [0003] At present, most of the GPR detection and interpretation technologies are based on the two-dimensional basis. Two-dimensional radar detection is based on the assumption that the geological body is uniform in the direction of the vertical detection section, that is, the geological body is infinitely extended, but in engineering In practice, ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01S7/02
CPCG01S7/4052G01S13/885
Inventor 孙伟蓝朝桢谢耕唐中平张冰李媛媛周杨李建胜邢帅
Owner 苏州市数字城市工程研究中心有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products