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Satelitski sprejemnik za spremljanje svetilniškega signala satelita Alphasat v frekvenčnem pasu Q (Ka)
ID MRAK, SEBASTIJAN (Author), ID Vidmar, Matjaž (Mentor) More about this mentor... This link opens in a new window, ID Hrovat, Andrej (Comentor)

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MD5: 3946E8E06C3DEC119F8C5D1B787C03CC
PID: 20.500.12556/rul/8aab18c3-8ef4-452a-8182-458d94161c06

Abstract
Tema magistrske naloge se navezuje na projekt preučevanja atmosferskih vplivov na razširjanje radijskih valov v milimetrskem pasu. V magistrski nalogi je opisan načrt in izdelava satelitskega sprejemnika za spremljanje svetilniškega signala satelita Alphasat na frekvenčnem pasu Q, ki temelji na programskem radiu. Izdelan satelitski sprejemnik sestoji iz mikrovalovne antene, nizko-šumnega bloka in digitalnega detektorja moči signala. Najkompleksnejši del opisanega satelitskega sprejemnika je nizko-šumni blok za milimetrsko področje. Zgrajen je kot superheterodinski sprejemnik iz diskretnih maloprodajnih komponent. Nizko-šumni blok je je razdeljen na posamezne module, katerih načrti so natančno opisani. Podani so rezultati meritev posameznih modulov, kjer so bile za razvoj posameznih komponent narejene simulacije so rezultati simulacij primerjani z rezultati meritev. Digitalni detektor signala je izdelan s programskim radiem, kjer se analogno-digitalna pretvorba in decimacija izvajata v namenski strojni opremi, digitalna obdelava signala pa teče kot programska oprema razvita v odprto-kodnem programskem paketu na namiznem računalniku. Program računa moč signala v močnostnem spektru in jo zapisuje v podatkovno datoteko. Satelitski sprejemnik, sestavljen v delujočo enoto, meri moč svetilniškega signala satelita Alphasat na frekvenčnem pasu Q. Sprejemnik je ovrednoten z laboratorijskimi meritvami, primerjanimi s teoretičnimi izračuni. Prikazani in obrazloženi so rezultati meritev za en dan sprejema signala in močnostni spekter signala. V zaključku so povzete glavne lastnosti izdelanega satelitskega sprejemnika. Podana je ocena aktualnosti teme in primerjava med prej obstoječimi merilnimi postajami in izdelanim satelitskim sprejemnikom. Naloga se zaključi z razmislekom o nadaljnjem delu in možnih izboljšavah.

Language:Slovenian
Keywords:Satelitski sprejemnik, nizko-šumni blok, milimetrski valovi, Alphasat, programski radio
Work type:Master's thesis/paper
Organization:FE - Faculty of Electrical Engineering
Year:2016
PID:20.500.12556/RUL-81644 This link opens in a new window
Publication date in RUL:22.04.2016
Views:3473
Downloads:1028
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Secondary language

Language:English
Title:Q-band (Ka-band) satellite receiver for observing Alphasat beacon
Abstract:
The Master's thesis addresses the research topic about atmospheric impairments on the millimeter-wave propagation. The design, implementation and validation of a Q-band satellite receiver for observing an Alphasat's Q-band beacon is presented. The receiver consists of a microwave antenna, Low-Noise Block (LNB) and digital detector based on Software Defined Radio (SDR). First, the design of a Q-band LNB is presented. The LNB is designed as a superheterodyne receiver, built with an off-the-shelf commercial components. In the thesis, an individual modules of the LNB are described, along with appropriate techniques. The simulation results are given and compared with actual measurements. The digital detector consists of a SDR hardware, where the Analog-to-Digital Conversion and decimation takes place, the digital signal processing runs on personal computer as a software developed in an open-source software framework. The program calculates the Received Signal Strength Information and writes it to a data file. Developed modules were validated with an appropriative measurements, and afterwards assembled to a fully working satellite station, observing Alphasat's Q-band beacon. Furthermore, the experimental results for a rainy day, of the real set-up are given and discussed. In the conclusion, an overview of the designed satellite receiver. The actuality of the topic is discussed and the designed receiver performance is compared with other Alphasat stations. Finally, the thesis is concluded with discussion about the future work.

Keywords:Satellite receiver, Low-Noise Block, Millimeter-waves, Alphasat, Software Defined Radio

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