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Technology of Receiving of Very Weak Signals from Interplanetary Spacecrafts
Špaček, Jiří ; Bezoušek, Pavel (referee) ; Kovář, Pavel (referee) ; Kasal, Miroslav (advisor)
The work deals with the problematics of receiving very weak radio signals and it is focused especially on systems for low rate telemetry with carrier-subcarrier modulation. The part of this work is dedicated to calculation the link budget of typicall telemetry data transmission system between the Mars and the Earth in respect of the receiving equipment, which could be developed in the Experimental sattelites laboratory on the Institute of radio electronics BUT. The main part of this work is dedicated to developing and testing the low rate telemetry data transmission system model. The model is developed for the purpose of study the effects of AWGN and phase noise on the whole system and also on its component parts. The model has been developed and described in the way of easy parameters modification. The design for each parameter of the model is described carefully. With the developed model, the study of the effects of AWGN and phase noise on the whole system and also on its component parts has been performed.
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UHF band front-end of quadrature receiver
Tiller, Jakub ; Špaček, Jiří (referee) ; Kasal, Miroslav (advisor)
The object of this master's thessis is study and description of RF circuits, which are used for receiveing. This work is also aimed to design this circuits and their simulation in Ansoft Designer software. Focus is placed to the standard parameters of receiving technology. The description of amplifier design is presented in this work. Parameters of this amplifier are optimalized to low noise figure. Frequency multiplier designs are included in this project.
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L-band receiver front-end
Kolář, Jan ; Špaček, Jiří (referee) ; Kasal, Miroslav (advisor)
This Master's Thesis deals with a design of L-band receiver front-end. In the concrete the receiver is designed for receiving signals of frequency band 1,3 GHz. All particular blocks from low noise amplifier to intermediate frequency amplifier and frequency doubler in LO input are described, designed and simulated in program Ansoft. The part of this Master's Thesis is aimed to construct a working front-end receiver and to measure its basic parameters.
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Local flood early warning system
Svoboda, Luděk ; Špaček, Jiří (referee) ; Růžek, Václav (advisor)
The aim of this Master's thesis is to design a local flood warning system. The system consists of two basic types of units. The first unit is placed in the field usingsensors and evaluates the presence of water in an otherwise dry area. In the event of flooding sends a warning message using wireless technology. The second unit evaluates the warning messages and informs the personabout the situation via text messaging. Outdoor equipment is fullyautonomous and permanently placed in an outdoor environment. The system is designed based 8-bit microcontrollers. The main parametersinclude low power devices, mechanical durability and reliability.
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Automatic test setup for airborne radio-communication system R-863
Kropáček, Ondřej ; Špaček, Jiří (referee) ; Dřínovský, Jiří (advisor)
The aim of this thesis is design and realization of automatic test bench for parameters analysis of airborn radio-communication system R-863. Firstly we have taken up principles of the analysis properties of the radio system R-863. Then we proposed test bench for parameters analysis. In the next step we realize and integrate the digital control panel into the test bench. In harmony with the previous steps we have made program and software for the automatic test bench. Finally we make the user manual, which is easy to use.
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Frequency Synthesizers
Lapčík, Josef ; Špaček, Jiří (referee) ; Dřínovský, Jiří (advisor)
This diploma thesis concerns with analysis and dividing of frequency synthesizers and design of DDS, PLL synthesizers. Base types of frequency synthesizers are described including differences between methods of their operation. Base circuits of both – DDS and PLL synthesizers and other important circuits are described in details at design part of this thesis. Design of DDS and PLL synthesizer is described in particular sections. Both synthesizers are directly realized and stand-alone control applications are created. PLL synthesizer is also ready to control thru Agilent VEE program environment. Particular example application is designed in Agilent VEE. This application is used as basis of attached lab project.
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FM Transmitter of APRS Telemetry in 435 MHz Band
Klíma, Martin ; Špaček, Jiří (referee) ; Urbanec, Tomáš (advisor)
FM transmitter APRS of telemetric data is device able to measure telemetric values from its ambient. It is able to send this data to user on earth by radio frequency channel. This device can create data frames, with proper formatting allowing sending data. It operates in 435 MHz band, uses FSK and AFSK modulation. This work describes basic information of used protocols, electronic connection of this transmitter and software equipment.
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FM Transmitter of APRS Telemetry in 144MHz Band
Sabol, Martin ; Špaček, Jiří (referee) ; Urbanec, Tomáš (advisor)
This work deals with analysis of protocol APRS Automatic Positioning System for telemetry. There is analyzed the structure of the most important frames and their application. It discusses the processing of GPS data and subsequent modulation of the selected frequency. This work also describes and discusses the proposed peripheral devices and the used firmware.
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