Prof. Jaroslav Cechak Profile

Prof. Jaroslav Cechak

Professor at Masaryk Univ

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Author

Publications (8)

Proceedings Article | 23 April 2010 Paper

Seismic-acoustic communication for UGS

Jaroslav Cechak

Proceedings Volume 7693, 76931D (2010) https://doi.org/10.1117/12.848752

KEYWORDS: Unattended ground sensors, Antennas, RF communications, Signal detection, Telecommunications, Photography, Signal processing, Reconnaissance systems, Sensors, Infrared sensors

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Proceedings Article | 6 August 2009 Paper

Low-flying target position finding with a seismic system

Jaroslav Cechak, Petr Hubacek, Jiri Vesely

Proceedings Volume 7502, 75020R (2009) https://doi.org/10.1117/12.837143

KEYWORDS: Signal processing, Target detection, Sensors, Atmospheric propagation, Correlation function, Wave propagation, Acoustics, Unattended ground sensors, Filtering (signal processing), Digital signal processing

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Proceedings Article | 6 August 2009 Paper

Low-flying target detection: a surface seismic waves application

Jaroslav Cechak, Petr Bojda

Proceedings Volume 7502, 75020S (2009) https://doi.org/10.1117/12.837144

KEYWORDS: Target detection, Signal detection, Signal processing, Digital signal processing, Unattended ground sensors, Wave propagation, Sensors, Particles, Earthquakes, Electronics

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Proceedings Article | 5 May 2009 Paper

Underground intrusion sensor for urban operations

Jaroslav Cechak

Proceedings Volume 7333, 733312 (2009) https://doi.org/10.1117/12.816905

KEYWORDS: Sensors, Unattended ground sensors, Receivers, Microcontrollers, Chemical elements, Modulation, Telecommunications, Buildings, Lithium, Warfare

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Proceedings Article | 16 April 2008 Paper

Warning equipment for UGS utilizing human body for data transmission and feeding

Jaroslav Cechak

Proceedings Volume 6963, 696312 (2008) https://doi.org/10.1117/12.771070

KEYWORDS: Unattended ground sensors, Sensors, Data transmission, Receivers, Prototyping, Electrodes, Wireless communications, Telecommunications, Microcontrollers, Transmitters

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Proceedings Article | 28 December 2007 Paper

Through the wall seeing in the ELF band

Jaroslav Cechak

Proceedings Volume 6937, 69373I (2007) https://doi.org/10.1117/12.784841

KEYWORDS: Antennas, Brain, Magnetism, Signal detection, Electromagnetism, Digital signal processing, Atmospheric physics, Signal processing, Atmospheric propagation, Physics

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Proceedings Article | 28 December 2007 Paper

Smart dust technology for detection and identification of persons

Jaroslav Cechak

Proceedings Volume 6937, 69373V (2007) https://doi.org/10.1117/12.784908

KEYWORDS: Sensors, Magnetic sensors, Picosecond phenomena, Unattended ground sensors, Environmental sensing, Magnetism, Microelectromechanical systems, Sensor networks, Signal processing, Telecommunications

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Proceedings Article | 11 May 2007 Paper

Detection of the under-soil intruder activity

Jaroslav Cechak

Proceedings Volume 6562, 656210 (2007) https://doi.org/10.1117/12.724084

KEYWORDS: Sensors, Antennas, Signal processing, Particles, Brain, Magnetism, Buildings, Electromagnetism, Wave propagation, Ferroelectric polymers

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The presented paper focuses on the possibilities of technical methods designed to detect a trespasser under the ground, and in general on the possibilities of detection a trespasser behind an obstruction. The paper analyses method of detection of a trespasser that were practically verified by the author of the paper. The first part of the paper discusses the characteristics and use of piezoelectric films that could be used as a replacement for the traditional geophone for detection of underground mining operation. It also provides a block connection diagram of the measuring chain and photos of the practical implementation of the sensor. The consequent part of the paper then discusses the possibilities of detecting a trespasser based on electromagnetic waves emission by humans in the ELF - Extremely Low Frequency band. The paper is supplemented with illustrative photos and results of numeric processing of signals in the form of graphs and courses. The history of excavating and using tunnels spans long into the past. Tunnels were used not only as storage for food and war material but mainly as effective means of protection against attackers. A significant motivating factor for constructing tunnels lies in the hidden possibility of movement of people and transfer of material under the ground of a protected perimeter. At present some tunnels are used as roads for smuggling drugs, weapons, ammunition or illegal passages of people. There are even cases, not exceptional, when tunnels were excavated with the aim to rob a bank safe etc. The fact that construction of tunnels, often quite primitive ones, is not sporadic, can be continually documented not only by historical sources but often also by the daily news summary. The concurrent lack of proper technological means results in the renaissance of using tunnels for illegal purposes even at present. The presented paper focuses on the above mentioned area and points to little used physical principles of detection underground activities of trespassers.

Showing 5 of 8 publications

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