GPR attenuation and its numerical simulation in 2.5 dimensions

Geophysics ◽  
1997 ◽  
Vol 62 (2) ◽  
pp. 403-414 ◽  
Author(s):  
Tong Xu ◽  
George A. McMechan
Keyword(s):  
Time Domain ◽  
Ground Penetrating Radar ◽  
Finite Difference Time Domain ◽  
Superposition Method ◽  
Frequency Data ◽  
Buried Pipe ◽  
Ground Penetrating ◽  
Cole Model ◽  
Difference Time

Modeling of ground‐penetrating radar (GPR) data in 2.5 dimensions is implemented by superposition of 2-D finite‐difference, time‐domain solutions of Maxwell's equations for different horizontal wavenumbers. Dielectric, magnetic, and conductive losses are included in a single formulation. Attenuations associated with dielectric and magnetic relaxations are introduced by superposition of Debye functions at a set of relaxation frequencies and using memory variables to replace convolutions between the field variables and the decay functions. Better fits to data may always be obtained using the superposition method than by the Cole‐Cole model. Good fits to both loss‐tangent versus frequency data from lab measurements, and to 500 and 900 MHz field GPR profiles of a buried pipe and the surrounding layers, demonstrate the flexibility and viability of the modeling algorithm. Discrepancies between lab and in‐situ measurements may be attributed to scale differences and local variations that make lab samples less representative of the site than the GPR profile.

scholarly journals Antena Spiral-dipole untuk Ground Penetrating Radar (GPR)

2016 ◽  
Vol 13 (2) ◽  
pp. 39
Author(s):  
Yuyu Wahyu ◽  
Haryanto Sachrawi S ◽  
Asep Yudi H ◽  
Heroe Wijanto
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Ground Penetrating Radar ◽  
Finite Difference Time Domain ◽  
Late Time ◽  
Ground Penetrating ◽  
Difference Time

GPR (Ground Penetrating Radar) merupakan divais yang berguna untuk proses pendeteksian objek yang terkubur di bawah permukaan tanah hingga kedalaman tertentu, tanpa perlu dilakukan penggalian tanah. Pada penelitian ini dilakukan perancangan, simulasi dan realisasi antena spiral-dipole dengan pembebanan resistif untuk aplikasi impulse GPR. Pembebanan resistif bertujuan untuk menekan late-time ringing dan memperbesar bandwidth walaupun akan mengurangi efisiensi amplitudo pulsa utama. Late-time ringing merupakan osilasi yang mengikuti pulsa yang dikirimkan. Osilasi ini dapat mengaburkan sinyal yang dipantulkan oleh objek sehingga menyulitkan untuk dilakukan proses deteksi. Dengan melakukan perubahan nilai konstanta k pada rumusan spiral Archimedes, maka didapatkan bentuk spiral dengan kerapatan yang berbeda-beda. Dalam tulisan ini, nilai konstanta k yang digunakan antara lain 0,5; 1; dan 1,5. Parameter yang dibahas dalam simulasi ini adalah amplitudo peak to peak pulsa utama maupun ringing yang dihasilkan dari masing-masing antena dengan nilai konstanta k yang digunakan. Analisis elektromagnetik dalam domain waktu digunakan metode FDTD (finite-difference time-domain) dengan software FDTD3D untuk menghitung gelombang yang ditransmisikan antena dalam domain waktu. Selanjutnya dilakukan realisasi dan pengukuran antena tersebut.

Ground Penetrating Radar Imaging Based on FDTD Migration Method

2012 ◽  
Vol 490-495 ◽  
pp. 1261-1264 ◽  
Author(s):  
Yao Qin ◽  
Qi Fu Wang
Keyword(s):  
Time Domain ◽  
Ground Penetrating Radar ◽  
Finite Difference Time Domain ◽  
Computer Memory ◽  
Migration Imaging ◽  
Detection Technology ◽  
Simulation And Experiment ◽  
Migration Method ◽  
Ground Penetrating ◽  
Difference Time

Estimation the shape and position of the objects is an important subject in ground penetrating radar(GPR). Migration method is popular used in seismic wave detection technology to locate and reshape the objects. Finite difference time domain(FDTD) migration method is widely used not only because the iterative method can save the computer memory but also because it is sensitive with different horizontal velocity and vertical velocity of electromagnetic wave. In this paper, migration imaging principle is been introduced at first, then FDTD migration method is been discussed. By dealing with GPR simulation and experiment image, it shows that the FDTD Migration method used in GPR imaging is effectiveness and stability.

scholarly journals Finite-difference time domain (FDTD) modeling of ground penetrating radar pulse energy for locating burial sites

2019 ◽  
Vol 67 (6) ◽  
pp. 1945-1953 ◽  
Author(s):  
Akinniyi Akinsunmade ◽  
Jerzy Karczewski ◽  
Ewelina Mazurkiewicz ◽  
Sylwia Tomecka-Suchoń
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Pulse Energy ◽  
Ground Penetrating Radar ◽  
Finite Difference Time Domain ◽  
Field Measurements ◽  
Data Interpretation ◽  
Real Field ◽  
Ground Penetrating ◽  
Difference Time

Abstract Analysis of the finite-difference time domain (FDTD) numerical simulation of ground penetrating radar (GPR) measurement for locating burial sites is described in this paper. Effective, efficient, and reliability interpretation of GPR field data obtained from clandestine sites is very crucial in forensic investigations. The main goal of the study is the prediction of the change in the interaction of the electromagnetic incident on changes in buried bodies with time. In order to achieve this, the research involves the modeling of the GPR electromagnetic pulse energy responses to simulated changes in buried body with time with a view to understand what the results of real field measurement will give. The field measurements were conducted with GPR system manufactured by Mala Geoscience with antennae frequency of 500 MHz, 250 MHz, and 100 MHz. Responses from both synthetic and field radargrams depict the target was intercepted at same time (approximately 25 ns). The results have demonstrated that FDTD modeling is an important tool for enhancing the reliability of GPR data interpretation particularly for forensic study.

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