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Four Channel Active Antenna Switch for UHF Band Satellite Reception
Kubeš, Václav ; Povalač, Aleš (referee) ; Urbanec, Tomáš (advisor)
The goal of this bachelor’s thesis is to design and implement a complex device known as an antenna switch, which allows receiving a high-frequency signal in the UHF band from satellites via one of five directional antennas at a given time. With a suitable choice of antennas, this device is to be an alternative to motorized directional antennas used for satellite signal reception. The device is able to determine the correct antenna switching order using satellite position data. It is also able to filter and amplify the selected high-frequency signal for further transmission via coaxial cable to the receiver. The switch is controlled by an ATmega328PB microcontroller, which ensures the control of the integrated switching element itself, simple current and temperature diagnostics, and bidirectional communication with the control computer using the UART protocol over the LIN bus physical layer. The whole device consists of an external unit, which is to be placed near the antennas and ensures the switching itself, and an internal unit placed inside the building, which ensures the power supply and the distribution of diplexed signals. The user can display diagnostic data and control the external unit using a program with a graphical interface.
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Educational PocketQube Satellite
Veverka, Jiří ; Zamazal, Michal (referee) ; Povalač, Aleš (advisor)
Tato diplomová práce je zaměřena na návrh výukového satelitu typu PocketQube 2P (50x50x100mm) a pozemní stanice, které budou využívány ve výuce STEM laboratoří. Navržený systém byl navržen s důrazem na modularitu, snadnou výměnu za použití komerčních volně dostupných součástek a snadné pochopení subsystémů, které lze v družici tohoto typu nalézt, tedy palubní počítač, komunikační modul, napájecí systém a payload. Mimo vnitřních modulů byla vyvinuta i vnější konstrukce, která je celá vyrobena z desek plošných spojů a dohromady tvoří základ družice. Vyvinutá družice a pozemní stanice využívají ke komunikaci rádiový modul RFM98W s modulací LoRa.
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Applicability of Low-Cost Picosatellites
Roman, Maroš ; Zamazal, Michal (referee) ; Povalač, Aleš (advisor)
Tato práce zkoumá využitelnost platforem picosatelitů nebo femtosatelitů ve vzdělávání. Popisuje se zde návrh femtosatelitové platformy jménem Femtostrat-1, která může sloužit jako vzdělávací nástroj pro univerzitní laboratorní cvičení. Platforma je navržena tak, aby obsahovala všechny systémy, které se očekávají na skutečné satelitní platformě. Jsou probírány možnosti využití této platformy, včetně různých metod vypuštění nebo různých komunikačních standardů. Navíc tato práce práce popisuje návrh a realizaci letového modelu Femtostrat-1. Na závěr je popsán stratosférický testovací let Femtostrat-1 a výsledky tohoto letu.
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Educational Nanosatellite in PocketQube Format
Lokaj, Jakub ; Zamazal, Michal (referee) ; Povalač, Aleš (advisor)
Hlavním tématem této diplomové práce byla teoretická analýza současných trendů ve vývoji nanosatelitů, konkrétně se zaměřením na formát PocketQube a jeho aktuální implementaci. V jednotlivých teoretických kapitolách se práce zabývá možnostmi a výhodami využití PocketQube jako výukového modelu pro vzdělávací a vývojové oblasti. Zabývá se také možnostmi 3D tisku nosné konstrukce družice a rozebírám jednotlivé komponenty, jako je palubní počítač, komunikační systém založený na technologii LoRa, napájecí systém a přehled subsystémů. V praktické části byl vyvinut rám družice, jednotlivé části struktury elektroniky PocketQube a implementace základní funkce komunikace a provozu pro vzdělávací model PocketQube.
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Universal monitoring and diagnostic probe for serial communication
Dvořák, Ondřej ; Povalač, Aleš (referee) ; Záplata, Filip (advisor)
The thesis deals with design of a device for communication analysis in standardized serial interfaces, with differing parameters. The goal of the thesis is a complete design of a device including wiring diagrams, PCB, get PCB alive and design complete device firmware. The device will be able to process and analyze data on selected interfaces. The user controls the device with the use of USB interface, connecting the device with a PC or other computing devices. Communication is done by a simple protocol in ASCII, its design is included in this thesis. The device can analyze errors in the interface and inform the user about them. Firmware should be flexible, to allow the addition of more interfaces and protocols.
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Software Defined Home Automation
Stupka, Dominik ; Brejl,, Milan (referee) ; Povalač, Aleš (advisor)
This thesis is about development and construction of systems for building automation. At the beginning it´s focused on usage of building automation. Short describe used topology of installation and available systems on the market. The second chapter is about designing of hardware’s elements systems. Then it’s describing control unit Raspberry Pi 3, microprocessors for communication and slave modules. For my thesis I am also engaged in interface communication and designing of I/O systems. The third and fourth chapter is describing software equipment’s of the system. The parts of microprocessor firmware and manner of control logic creating and visualization in control unit module are described in details. Last chapter contains the description of construction of testing module and measuring of system parameters.
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Wireless communication module in 868 MHz band with MESH network support
Uhlíř, Marcel ; Fedra, Zbyněk (referee) ; Povalač, Aleš (advisor)
This thesis deals with design of a wireless communication module that allows communication in the unlicensed band at the frequency of 868 MHz. The designed module can be easily implemented in various types of embedded devices using SMT technology. This communication module consists of a low-power radio frequency transmitted, balancing element, impedance matching, radio antenna and electromagnetic shielding. Communication between the embedded device and the wireless communication module is realized using the SPI interface and configurable GPIOs. Part of this work is the proposed firmware library, which operates the wireless communication module and allows communication in peer-to-peer mode and in MESH network mode. A procedure for its creation and management is created as part of the MESH network. The use of this work is directed to the field of control and sensor systems with application in automation.
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Laboratory waveform generator based on DDS
Kret, Tomáš ; Povalač, Aleš (referee) ; Šebesta, Jiří (advisor)
The project concerns about design of function generator based on direct digital synthesis, its software and hardware realisation. It solves generating functions depended on time like sine, triangle and square with variable duty cycle, burst and other functions of frequency sweep, FM and PWM modulation. Next goal is to display user interface on graphic LCD display and to control microcontroler pheripheries of AVR.
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Design and implementation of educational CubeSat
Košút, Martin ; Zamazal, Michal (referee) ; Povalač, Aleš (advisor)
This thesis describes the design of a CubeSat with a 1U (10x10x10 cm) size, which will be used in laboratory tasks. It includes mechanical construction printed on a 3D printer with six photovoltaic cells, mounted on the top. Cells will produce electricity to power all systems and to charge the onboard NiMH batteries to make the CubeSat independent of other sources of energy. The proposed design of an electrical power supply system and an onboard computer combined with a communication system is based on off the shelf components. The two-way wireless communication link between computer and a CubeSat is realized thanks to the ground station, which is also part of a design. Students will make other systems, which will communicate with the built in onboard computer via internal RS 485 communication bus. Internal EEPROM memory is used to save measured values. Modularity, possible future expandability, and easy repair in case of any failure were the key optimization parameters of the design.
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