Finite-difference time-domain modelling of through-the-Earth radio signal propagation

Ralchenko, M.; Svilans, Markus; Samson, C.; Roper, Mike

doi:10.1016/j.cageo.2015.09.018

Cited by 19 publications

(7 citation statements)

References 27 publications

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“…Recently, many classical identification methods for the transfer functions are used widely in process control and signal processing [7,8]. The classical identification methods for transfer functions are based on the time-domain models and the frequency-domain models.…”

Section: Introductionmentioning

confidence: 99%

Parameter estimation algorithms for dynamical response signals based on the multi‐innovation theory and the hierarchical principle

Ding

2017

IET signal process.

128

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In this study, the authors consider the parameter estimation problem of the response signal from a highly non-linear dynamical system. The step response experiment is taken for generating the measured data. Considering the stochastic disturbance in the industrial process and using the gradient search, a multi-innovation stochastic gradient algorithm is proposed through expanding the scalar innovation into an innovation vector in order to obtain more accurate parameter estimates. Furthermore, a hierarchical identification algorithm is derived by means of the decomposition technique and interaction estimation theory. Regarding to the coupled parameter problem between subsystems, the authors put forward the scheme of replacing the unknown parameters with their previous parameter estimates to realise the parameter estimation algorithm. Finally, several examples are provided to access and compare the behaviour of the proposed identification techniques.

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Section: Introductionmentioning

confidence: 99%

Parameter estimation algorithms for dynamical response signals based on the multi‐innovation theory and the hierarchical principle

Ding

2017

IET signal process.

128

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“…We propose to improve upon this work by using the finite-difference time-domain (FDTD) code developed for modelling TTE radio transmissions in Ralchenko et al (2015) to fit a conductivity model.…”

Section: Proposed Approachmentioning

confidence: 99%

“…In our previous work (Ralchenko et al, 2015(Ralchenko et al, , 2016(Ralchenko et al, , 2017b, we developed a finitedifference time-domain (FDTD) code optimized for modelling TTE radio transmissions. In the FDTD method, complex geometries are discretized using a grid, usually rectangular, and Maxwell's equations in differential form are solved by marching forward at a given time step.…”

Section: Finite-difference Time-domain Modellingmentioning

confidence: 99%

“…In particular, we seek to determine the conductivity structure of a mine overburden through which a TTE radio link is to be established. In our previous work (Ralchenko et al, 2015), we simulated TTE radio signal propagation using the finite-difference time-domain (FDTD) method, for an arbitrary transmitter in an arbitrary geologic structure. This modelling approach assumed a conductivity distribution based on a literature review for similar rock types, which may not be representative of the in-situ properties of the rocks of a specific site.…”

Section: Introduction and Objectivementioning

confidence: 99%

“…The position of the transmitter relative to the building is an additional factor of interest; if the transmitter is outside, magnetic field lines not penetrating the building will not be attenuated by the conductive floors or walls. To reliably account for these effects, a numerical model is needed, as has previously been done for analyzing TTE radio transmissions (Ralchenko et al, 2015(Ralchenko et al, , 2016(Ralchenko et al, , 2017b.…”

Section: Introductionmentioning

confidence: 99%

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Modelling and optimizing through-the-Earth radio transmissions

Ralchenko¹

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Through-the-Earth (TTE) radio has been proposed for emergency communications in locations inaccessible by conventional means, such as underground mines. While the technology is viable, it is unclear how the signal propagates in inhomogeneous media; neither modelling or obtaining a conductivity distribution in the context of TTE radio has been previously attempted. With a robust model, many practical questions can be answered, such as what is the maximum range or the optimal frequency to use, or where the transmitter and receiver should be ideally placed. To this end, a finitedifference time-domain (FDTD) code was developed and optimized for the forward modelling of TTE radio transmissions. This method is computationally intensive, and to improve performance, it was run on a graphics processing unit (GPU). The This thesis could not have been done without the contributions of many people. First, I would like to thank my supervisor, Prof. Claire Samson, for her invaluable advice for not only during this thesis, but over my whole scientific career since the summer after my second year during my undegraduate studies. I thank Vital Alert Communication, Inc., for their valuable financial support, via the Industrial Postgraduate Scholarship program with the Natural Sciences and Engineering Research Council (NSERC) over the course of my research. Mr. Markus Svilans provided extended advice and guidance during my PhD, particularly during the first half. Mr. Mike Roper also provided considerable input over the course of the PhD thesis, especially during the latter half. Mr. Michael Homer is thanked for proofreading and giving his blessing to submit all the papers and abstracts, as well as for his assistance in the field. Mr. Vladimir Puzakov is thanked for his help with the hardware and for assistance in the field. Mr. Brian Du is thanked for his assistance in the field. Dr. Peter Kwasniok is thanked for his input into the numerous experiments done over the past three years. Mr. Andrew Schenk is thanked for his assistance with the hardware. Mr. Andrew Wahl is thanked for his logistical assistance. Mr. John Steckley, of Innovative Wireless Techologies, is thanked for his assistance in the field, during a trip to West Virginia demonstrating IWT and Vital Alert products. The committee for my comprehensive examination, Prof. Dariush Motazedian iv

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Contribution of analysis and detection the risks appearing in roads using GPR method: A case study in Morocco

Alsharahi

Bouami

Faize

et al. 2021

Ain Shams Engineering Journal

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Finite-difference time-domain modelling of through-the-Earth radio signal propagation

Cited by 19 publications

References 27 publications

Parameter estimation algorithms for dynamical response signals based on the multi‐innovation theory and the hierarchical principle

Parameter estimation algorithms for dynamical response signals based on the multi‐innovation theory and the hierarchical principle

Modelling and optimizing through-the-Earth radio transmissions

Contribution of analysis and detection the risks appearing in roads using GPR method: A case study in Morocco

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