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System for Precise Measurement of Electrical Length of Coaxial Cables
Podr, Michal ; Polívka,, Milan (referee) ; Šebesta, Jiří (advisor)
This thesis describes a study of the measuring methods determining the electrical length of coaxial cable without using a vector network analyzer. First, a general theory of management and its various parameters is briefly discussed. This section is focused more specifically on the coaxial cable and its parameters. The next part is graphically analyzed process considerations in the design of measurement methods and outlined the block structure of the system. The third section describes the working process, prototype testing of the bridge, its measurement and design of the measuring system. In the fourth part the software is described. In conclusion, the results of the work are discussed, accuracy of the measurement system, the obtained parameters chosen with regard to the principle of the measurement system and the overall evaluation of the applicability in practice.
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MW Converter for SW Receiver
Lejsková, Alena ; Lukeš, Zbyněk (referee) ; Šebesta, Jiří (advisor)
This thesis concerns about the network synthesis of receivers with the demand for conversion of the input signal and a following implementation of assigned converter. At first it introduces the readers with the basic division of radio waves and with parts, which are important for a high-quality receiver, then it deals with general properties of input networks of receivers, division of parts and kinds of connection, that are used in the communications. The concept of connection is intended to nonspecialists too, that is why it describes step by step each of parts of the network, including the calculation or possible solution and the choice of convenient parts. The aim is also to present the frequency conversion as an important part of signal receiving that we want to use in communication systems.
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Neural Networks in Inertial Navigation Systems
Tejmlová, Lenka ; Ochodnický,, Ján (referee) ; Masopust, Jiří (referee) ; Šebesta, Jiří (advisor)
Disertační práce je zaměřena na oblast inerciálních navigačních systémů a systémů, které pro odhad polohy používají pouze výpočty. Důležitým faktem v dané problematice je vysoká nepřesnost určení polohy při střednědobém a dlouhodobém využívání takového systému díky kumulativní chybě za předpokladu, že inerciální systém není podpořen žádným dalším přídavným systémem. V disertační práci jsou uvedeny možné přístupy k této problematice a návrh na zvýšení přesnosti určování polohy pouze na základě inerciálních senzorů. Základem inerciální měřicí jednotky je systém s 9 stupni volnosti, který umožňuje snímat celkové zrychlení, rychlost rotace a sílu magnetického pole, jednotlivě ve třech osách. Klíčovou myšlenkou je zařazení umělých neuronových sítí do navigačního systému tak, že jsou schopny rozpoznat charakteristické rysy pohybů, a tím zvýšit přesnost určení polohy. Popis navrhovaných metod zahrnuje analytický postup jejich vývoje a tam, kde je to možné, i analytické hodnocení jejich chování. Neuronové sítě jsou navrhovány v prostředí MATLABTM a jsou používány k určení stavu inerciální jednotky. Díky implementaci neuronových sítí lze určit pozici jednotky s řádově vyšší přesností. Aby byl inerciální polohovací systém s možností využití neuronových sítí demonstrativní, byla vyvinuta aplikace v prostředí Qt. Navržený systém a neuronové sítě byly použity při vyhodnocování reálných dat měřených senzory.
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Electronic control of servomechanism for drive-simulator
Valouch, Martin ; Šebesta, Jiří (referee) ; Fedra, Zbyněk (advisor)
The aim of this bachelor´s thesis was construct electronic driving unit of positioning servomechanism in driving simulator. As controlling unit was chosen 8-bit microcontroller ATmega16 produced by ATMEL® and for scan actual angle of displacement the seat magnetic rotation encoder AS5040 produced by Austriamicrosystems®. For construction of bridge circuit were chosen MOS transistors. This transistors are excited by two Power MOSFET Drivers. Their job is convert output signal TTL logic from microcontroller to voltage in needed norm for transistors circuit closing. Data from PC in drive simulator can be transfer by serial interface RS485 or RS232.
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Exhaustion control system
Bršel, Boris ; Šebesta, Jiří (referee) ; Fedra, Zbyněk (advisor)
The topic for my bachelor’s thesis is control system of exhaustion for wood industry. It is very broad issue, and since I am without experiences in this division I have chosen to create easier model of exhaustion system. I would like to continue in this project in master´s thesis too. My thesis consists of description the requisites for system like this, draft of the preparation and also practical preparation for joinery manufactory. I have decided to control the parts of system by microcontrollers, which communicate with each other wireless and control activity of system´s parts of exhaustion in workshop. The role of this thesis was also to compare the achieved results with other possibilities of control of exhaustion from the economic and technological points of view.
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Flight statements electronic sensor.
Harant, Josef ; Fedra, Zbyněk (referee) ; Šebesta, Jiří (advisor)
This diploma thesis deals with theoretical analysis, design and practical solution of flight statements electronic sensor. This device is primarily intended for measuring telemetry data during aerobatic flights. Theoretical part contains fundamentals of GPS and inertial navigation systems. Design of the device is divided into three parts - design of block structure, construction and software for the measuring device. The final realization is made with respect to minimal system requirements and to possible future extensibility for wider usage spectrum.
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Electric guitar combo design
Obr, Viktor ; Šebesta, Jiří (referee) ; Dušek, Martin (advisor)
The text of this bachelor´s thesis describes designing a construction of electric guitar combo. The first part of the project deals with history of guitar amplifiers and theory of design of individual components. The second part includes actual designs of guitar effect units (fuzz and tremolo), correction preamplifier, power amplifier with integrated circuit TDA7293V, power supplies for all components and choice of speakers for guitar combo. All effect units and preamplifier are also simulated in PSpice. In the last part there are results of measurements of all components and the whole combo.
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Wireless system for remote control of pan–tilt–zoom cameras
Chýlek, Richard ; Republic), (SAAB Technologies Czech (referee) ; Šebesta, Jiří (advisor)
This semestral project is concerned with remote control PTZ camera using the wireless controller, and the controller design including design documents. The controller will be composed of the signal converter, microcontroller and RF module. Control data to the controller will come via link RS485 and controller will be able to communicate using the following protocols-Ernitec and Pelco. The proposed controller, according to data from the manufacturer to have a range of up to 500m. This parameter and also other transmission parameters confirm in the diploma thesis which will focus the actual implementation of the controller.
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