Theory, design and implementation of a digital receiver for the Advanced Communications Technology Satellite (ACTS) beacons

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dc.contributor.authorSylvester, William R.en
dc.contributor.committeechairNunnally, Charles E.en
dc.contributor.committeememberBeex, A. A. Louisen
dc.contributor.committeememberPratt, Timothy J.en
dc.contributor.committeememberStutzman, Warren L.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:43:00Zen
dc.date.adate2009-08-18en
dc.date.available2014-03-14T21:43:00Zen
dc.date.issued1992en
dc.date.rdate2009-08-18en
dc.date.sdate2009-08-18en
dc.description.abstractThis document describes the theory, design and implementation of a digital receiver designed for the ACTS propagation experiments. The Virginia Tech Satellite Communications Group is designing, constructing and distributing eight ACTS propagation terminals (APTs) under a contract with NASA. The terminals will measure the received signal power from the ACTS satellite beacons (20 GHz, 27.5 GHz) in various climates at different elevation angles. The resulting signal power measurement, radiometer and weather measurement data will be used to characterize atmospheric effects on signal propagation at Ka band. Each APT system will contain two identical, independent digital receivers; one 20 GHz channel and one 27.5 GHz channel. The algorithm implemented on each receiver utilizes the results of multiple fast Fourier transforms to reliably identify the carrier tone amidst neighboring modulation tones. The acquisition procedure, can reliably identify the carrier signal at signal-to-noise ratios down to 10 dB in a 20 Hz bandwidth (23 dBHz in a 1 Hz bandwidth, -26 dB relative to clear air conditions on the APT system) in 2 seconds. The receiver then uses a comb filter, two FIR filters and additional FFTs to produce power measurements accurate to 0.1 dB at signal-to-noise ratios down to 5 dB in a 20 Hz bandwidth (18 dBHz in a 1 Hz bandwidth, -31 dB relative to clear air conditions on the APT system) at 1 Hz and 20 Hz sampling rates. The algorithm also provides several supplemental functions including a software selectable detection bandwidth from 2 Hz to 50 Hz (1 Hz increments), spectrum analyzer type output for a 303.333 kHz bandwidth centered on the current carrier frequency and carrier frequency estimates accurate to ±O. 5 Hz.en
dc.description.degreeMaster of Scienceen
dc.format.extent234 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-08182009-040444en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08182009-040444/en
dc.identifier.urihttp://hdl.handle.net/10919/44288en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1992.S977.pdfen
dc.relation.haspartLD5655.V855_1992.S977_drw01.pdfen
dc.relation.isformatofOCLC# 26812965en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1992.S977en
dc.subject.lcshArtificial satellites -- Designen
dc.subject.lcshBeaconsen
dc.subject.lcshMicrowave receiversen
dc.titleTheory, design and implementation of a digital receiver for the Advanced Communications Technology Satellite (ACTS) beaconsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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