National Repository of Grey Literature 17 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
X-band Earth Observation Satellite Software Defined Receiver
Zedka, Radim ; Bobula, Marek (referee) ; Záplata, Filip (advisor)
Práce se zabývá procesem návrhu digitálního přijímače pro signály družic dálkového průzkumu Země v pásmu X. V první části je uveden seznam družic které umožnují příjem vědeckých dat pomocí amatérských neautorizovaných stanic. Jsou zde vypsány základní signálové parametry některých družic, z nichž EOS-PM-1 je zvolena jako hlavní objekt pro návrh přijímače. Ve druhé části je použit software MATLAB pro simulaci družicového O-QPSK signálu v základním pásmu, mechanizmu kompenzace kmitočtového ofsetu, synchronizaci nosné, symbolové synchronizaci, rámcové synchronizaci a odstranění fázové dvojznačnosti vlivem modulace. Třetí část práce pojednává detailněji o implementaci jednotlivých bloků přijímače do FPGA při použití aritmetky s pevnou řádovou čárkou. Je zde popsána metoda pro verifikaci celého designu v reálném čase a závěrem je zde uvedeno porovnání výsledků měření touto metodou a výsledků simulace.
Antenna a LNA for multiband GNSS receiver
Ondráš, Michal ; Baran, Ondřej (referee) ; Záplata, Filip (advisor)
This project describesa microwave antenna for GNSS and low noise amplifier. Mikrostrip antenna is a modern type of antenna. This mikrostrip antenna is Dual – band antenna with circual polarization. The thesis describes how to make anantenna, what a circular polarization is, whata patch antenna is and what GNSS is. Low noise amplifier amplifies the antenna output signal.
RF Unit for Portable Monitoring Station
Rokos, Lukáš ; Urbanec, Tomáš (referee) ; Záplata, Filip (advisor)
The thesis describes methods for spectrum monitoring, which are used by the Czech telecommunication office. The thesis describes a design of an RF unit for a portable monitoring station and its potential use. The RF unit consists of several devices, which are connected. Devices like an antenna, a rotator, a rotator control unit, coaxial switches, an amplifier and attenuator were chosen as commercially available devices. It is also described, why were these devices chosen. Other devices such as filters, a control unit for the RF unit and a power supply were designed. The RF unit is controlled by a computer. A software for spectrum monitoring contains a graphical user interface for the RF unit control.
HID Touch Pad Reference Design
Děcký, Miroslav ; Záplata, Filip (referee) ; Povalač, Aleš (advisor)
This master’s thesis deals with the draft and design of HID periphery Touchpad. The Kinetis microcontroller produced by NXP, TSI periphery and embedded library NXP Touch are used for the design. The resulting device is connected as USB HID type mouse or trackpad. Hardware part of the project is implemented by whole MCU Kinetis Family on PCBs designed by author, one part also uses evaluation kits NXP Freedom KL25z and KE15z.
SDR Signal Processing for Portable Monitoring Station
Svobodník, Petr ; Záplata, Filip (referee) ; Šebesta, Jiří (advisor)
Goal of this thesis is to develop portable monitoring station for radio spectrum monitoring and its controlling application for use by Czech Telecommunication Office. The station is based on Software Defined Radio (SDR) and capable of monitoring in the range of 1 MHz - 6 GHz. Developed application controls not only the SDR but also the external RF unit (including choice of receiving antenna, filter, optional amplification/attenuation and azimuth of antenna rotator). Measurement processed by computer and displayed graphically in form of spectrum diagram and waterfall diagram. Furthermore, the application will perform spectral measurement in compliance with requirements of International Telecommunication Union. The application is also capable of recording into the file and of analyzing historical data from the previous measurement.
Automatic elevation and azimuth measurement system
Večeřa, Jindřich ; Kasal, Miroslav (referee) ; Záplata, Filip (advisor)
This bachelor´s thesis deals with an automatic elevation and azimuth measurement system, which will be used for antenna positioning. It is realized by using magnetometer and accelerometer. Important part of the system is tilt compensation and calibration for selected location. This system will send data to PC and also display them on LCD display. This project contains theory of measured quantities, method choice, component choice, realization of wiring, PCB design, programming device, testing device and accuracy determination.
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.
Laboratory High-Frequency Generator
Konzal, Jan ; Záplata, Filip (referee) ; Šebesta, Jiří (advisor)
This thesis describes a proposal of laboratory high frequency generator based on the principle of indirect analogue synthesis with a phase sling. The first part of the work describes the principle of a direct numerical and indirect analogue synthesis. Frequency range of the designed generator is up to 900 MHz. The output of the generator is designed to be up to 12dBm. Output impedance is 50 . To reach a frequency of oscillation lower than 800 MHz, the principle of fusion is used. Further, the control was suggested to be carried out by a microprocessor. Operating is realized using a keyboard and a rotary encoder.
L-band antenna and low noise amplifier
Kučera, Ondřej ; Lukeš, Zbyněk (referee) ; Záplata, Filip (advisor)
This master thesis is dealing with a system for receiving meteorological images from satellites placed on lower orbit. Furthermore it gives basic information about satellites NOAA, METOP and FY. It also includes derivations of equations, that define minimal requirements for receiving antenna and LNA. From reached parametres, energetic balance for connection of the satellite and Earth is calculated. The main part of the master thesis is designing of low-noise amplifier for L band. LNA is implemented on the substrate FR4 and Arlon DiClad 870, circuit is designed with elements of parametres, which are spread out or concentrated. The last part of the thesis describes design of antenna for reception of meteorological images.
L-band frequency converter for reception of the digital meteorological images
Bürger, David ; Frydrych, Jiří (referee) ; Záplata, Filip (advisor)
Down converter is a mixer which have a three ports. Two ports are refered as input ports and one port is ouput. One input port is connected to a signal which is transmited by meteorological satellites at frequency 1,7 GHz this frequency falls within the L–band. Meteorogical images are trasmited in L-band. The second input port is connected to a local oscillator in this case voltage control oscillator. The output signal includes sum and differential products, for down conversion is logically used differential product. Down conversion is used to convert data that are transmitted at high frequency to lower frequency which can be futher processed and then displayed data on the end device.

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