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Microprocessor control unit with frequency synthesizer for SW radiostation
Povalač, Aleš ; Fuchs, Michal (referee) ; Šebesta, Jiří (advisor)
The thesis is focused on the development of a radioamateur short-wave transceiver. The basic functions, features and parameters are described in the introduction. The bandplan and appropriate types of emission are also included in the introductory part. The frequency synthesis module is discussed in the second part of the document. Emphasis is placed on the direct digital synthesis method (DDS) using modern Analog Devices circuits. The proposed DDS module includes a high-speed clock source. The description of an intermediate frequency module with a demodulator is also placed there. The final part in devoted to the design of a transceiver control panel with a graphical display, a keyboard and a rotary encoder. The firmware for an ATmega128 microcontroller is described in detail at the end of the thesis.
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Communication model using Data distribution service and communication security assessment
Frollo, Martin ; Fujdiak, Radek (referee) ; Pokorný, Jiří (advisor)
The diploma thesis is focusing on middleware layer in distributed systems. It introduces typically used communication protocols and standards operating on this layer. In theoretical part it brings closer look at OMG DDS specification. This part contains fundamental functionalities of this specification along with its architecture blocks. Thesis also describes the RTPS protocol functionality. Existing implementations of OMG DDS standard are described at the end of theoretical part. OpenDDS 3.13 implementation is used in practical part of thesis. It is deployed and tested on various platforms. Next part verifies option of securing RTPS data stream using beta version of OMG DDS Security, which OpenDDS 3.13 implementation contains. Secured and unsecured data flows are being compared. Latency of data stream is also important, especially in distributed systems. DDS system, which measures latency of RTPS stream is created in practical part. Latency of this DDS system can be measured in various configurations. Difference of devices’ performance used in measurements can be clearly seen in latency results where the size of data samples is increasing. Differences of measured latency are also recognizable between reliable and unreliable and secure and unsecure RTPS stream. Part of measurements is made between 2 physical devices with and without an attacker. Type of attack is MITM and it captures RTPS flow, which does not belong to attacking machine.
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Cyber-security in systems of publish-subscribe type
Detko, Adam ; Blažek, Petr (referee) ; Pokorný, Jiří (advisor)
This thesis deals with data distribution service and is divided into three parts. The first part of this thesis focuses on theoretical knowledge of data distribution service. This section gradually introduces the model used in data distribution service, quality of service and the RTPS protocol, which was specially developed for the needs of data distribution service. The most comprehensive part of the theoretical part deals with security in data distribution service. At the end of the first part of this thesis, selected impelementations of data distribution service are introduced. The second part of this thesis deals with practical use of data distribution service, while OpenDDS implementation is chosen for the practical part. This part initially deals with the design of basic communication scenarios, followed by the design of complex communication scenarios. In the next chapters, within the practical part, the thesis is focused on verifyng security of the data distribution service selected implementation, design of security incidents and their subsequent simulation. Content of the final part of this thesis is the introduction of a tool designed for this thesis, which is used to implement selected types of attacks.
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Implementation of OMG/DDS model and communication analysis
Bučko, Kristián ; Fujdiak, Radek (referee) ; Pokorný, Jiří (advisor)
In bachelor´s thesis there is an introduction of OMG DDS specification, theoretical comparison of three most widespread implementations OpenDDS, Vortex Opensplice and RTI Connext, too. Important differences between data-focused publish-subscribe and object-focused client-server (e.g. CORBA) communication are also described in the thesis, as well as the usefulness of these two types in real-time systems. Implementation of RTI Connext is practically demonstrated on various types in scenarios of unsecured and secured communication where the communications themselves are caught in wireshark. The safety is evaluated in captured transfers. The publisher and subscriber codes were adjusted according to a need of measurement by which a communication latency between various sizes of a message is analyzed. A script in Python programming language was created for processing of timestamps and averaging values. A complete comparison of these scenarios and their graphical visual display are done in the end.
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Simulation of Unmanned Aircrafts in a Virtual Environment
Lindtner, David ; Lázna, Tomáš (referee) ; Gábrlík, Petr (advisor)
The master thesis deals with the issue of simulation of unmanned aircraft missions in a virtual environment. The aim of the work is to demonstrate basic and more advanced autonomous aerial missions in the simulated environment Gazebo - ROS 2. The work emphasizes the stability of the software solution and the stability of the communication between critical components of the aerial mission.
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Design of multipurpose generator of low- and high-frequency sub-bands
Caban, Dominik ; Brančík, Lubomír (referee) ; Šotner, Roman (advisor)
The thesis focuses on the generation of harmonic and non-harmonic waveforms in the low and high-frequency domains. The thesis aims to design and implement a portable multipurpose signal generator with a user interface powered by its own battery. The design focuses on the implementation of a function generator, a high-frequency generator, and a pulse generator with Gaussian characteristics within a single portable device. The thesis describes an introduction to signal generators, the selection of the individual components, the design procedure for each circuit, and their subsequent hardware implementation either within the development kit or the final product.
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Simulation of Unmanned Aircrafts in a Virtual Environment
Lindtner, David ; Lázna, Tomáš (referee) ; Gábrlík, Petr (advisor)
The master thesis deals with the issue of simulation of unmanned aircraft missions in a virtual environment. The aim of the work is to demonstrate basic and more advanced autonomous aerial missions in the simulated environment Gazebo - ROS 2. The work emphasizes the stability of the software solution and the stability of the communication between critical components of the aerial mission.
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Cyber-security in systems of publish-subscribe type
Detko, Adam ; Blažek, Petr (referee) ; Pokorný, Jiří (advisor)
This thesis deals with data distribution service and is divided into three parts. The first part of this thesis focuses on theoretical knowledge of data distribution service. This section gradually introduces the model used in data distribution service, quality of service and the RTPS protocol, which was specially developed for the needs of data distribution service. The most comprehensive part of the theoretical part deals with security in data distribution service. At the end of the first part of this thesis, selected impelementations of data distribution service are introduced. The second part of this thesis deals with practical use of data distribution service, while OpenDDS implementation is chosen for the practical part. This part initially deals with the design of basic communication scenarios, followed by the design of complex communication scenarios. In the next chapters, within the practical part, the thesis is focused on verifyng security of the data distribution service selected implementation, design of security incidents and their subsequent simulation. Content of the final part of this thesis is the introduction of a tool designed for this thesis, which is used to implement selected types of attacks.
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Implementation of OMG/DDS model and communication analysis
Bučko, Kristián ; Fujdiak, Radek (referee) ; Pokorný, Jiří (advisor)
In bachelor´s thesis there is an introduction of OMG DDS specification, theoretical comparison of three most widespread implementations OpenDDS, Vortex Opensplice and RTI Connext, too. Important differences between data-focused publish-subscribe and object-focused client-server (e.g. CORBA) communication are also described in the thesis, as well as the usefulness of these two types in real-time systems. Implementation of RTI Connext is practically demonstrated on various types in scenarios of unsecured and secured communication where the communications themselves are caught in wireshark. The safety is evaluated in captured transfers. The publisher and subscriber codes were adjusted according to a need of measurement by which a communication latency between various sizes of a message is analyzed. A script in Python programming language was created for processing of timestamps and averaging values. A complete comparison of these scenarios and their graphical visual display are done in the end.
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Communication model using Data distribution service and communication security assessment
Frollo, Martin ; Fujdiak, Radek (referee) ; Pokorný, Jiří (advisor)
The diploma thesis is focusing on middleware layer in distributed systems. It introduces typically used communication protocols and standards operating on this layer. In theoretical part it brings closer look at OMG DDS specification. This part contains fundamental functionalities of this specification along with its architecture blocks. Thesis also describes the RTPS protocol functionality. Existing implementations of OMG DDS standard are described at the end of theoretical part. OpenDDS 3.13 implementation is used in practical part of thesis. It is deployed and tested on various platforms. Next part verifies option of securing RTPS data stream using beta version of OMG DDS Security, which OpenDDS 3.13 implementation contains. Secured and unsecured data flows are being compared. Latency of data stream is also important, especially in distributed systems. DDS system, which measures latency of RTPS stream is created in practical part. Latency of this DDS system can be measured in various configurations. Difference of devices’ performance used in measurements can be clearly seen in latency results where the size of data samples is increasing. Differences of measured latency are also recognizable between reliable and unreliable and secure and unsecure RTPS stream. Part of measurements is made between 2 physical devices with and without an attacker. Type of attack is MITM and it captures RTPS flow, which does not belong to attacking machine.
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