scholarly journals Creating finite-difference time-domain models of commercial ground-penetrating radar antennas using Taguchi’s optimization method

Geophysics ◽  
2011 ◽  
Vol 76 (2) ◽  
pp. G37-G47 ◽  
Author(s):  
Craig Warren ◽  
Antonios Giannopoulos
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Ground Penetrating Radar ◽  
Finite Difference Time Domain ◽  
Numerical Models ◽  
Optimization Method ◽  
Near Surface ◽  
Domain Models ◽  
Ground Penetrating ◽  
Difference Time

Very few researchers have developed numerical models of ground-penetrating radar (GPR) that include realistic descriptions of both the antennas and the subsurface. This is essential to be able to accurately predict responses from near-surface, near-field targets. We have developed a detailed 3D finite-difference time-domain models of two commercial GPR antennas — a Geophysical Survey Systems, Inc. (GSSI) 1.5-GHz antenna and a MALÅ Geoscience 1.2-GHz antenna — using simple analyses of the geometries and the main components of the antennas. Values for unknown parameters in the antenna models (due to commercial sensitivity) were estimated by using Taguchi’s optimization method, resulting in a good match between the real and modeled crosstalk responses in free space. Validation using a series of oil-in-water emulsions to simulate the electrical properties of real materials demonstrated that it was essential to accurately model the permittivity and dispersive conductivity. When accurate descriptions of the emulsions were combined with the antenna models, the simulated responses showed very good agreement with real data. This provides confidence for use of the antenna models in more advanced studies.

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.

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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