| Satellite Communications and Navigation |
| Semester: |
| SoSe 24 |
| Veranstaltungstyp: |
| Vorlesung (Lehre) |
| Veranstaltungsnummer: |
| lv2710_s24 |
| DozentIn: |
| Gerhard Bauch, Rico Mendrzik, David Jonas Kopyto, PD Dr.-Ing. habil. Rainer Grünheid |
| Beschreibung: |
- Introduction to satellite communications
- What is a satellite
- Overvieworbits, Van Allen Belt, components of a satellite
- Satelliteservices
- Frequencybands for satellite services
- InternationalTelecommunications Union (ITU)
- Influenceof atmospheric impairments
- Milestonesin satellite communications
- Componentsof a satellite communications system
- Groundsegment
- Spacesegment
- Controlsegment
- Communicationlinks
- Uplink,downlink
- Forwardlink, reverse link
- Intersatellitelinks
- Multipleaccess
- Performancemeasures
- Effectiveisotropic radiated power (EIRP), antenna gain, figure of merit, G/T, carrier tonoise ratio
- Signalto noise power ratio vs. carrier to noise ratio
- Singlebeam and multibeam satellites
- Beamcoverage
- Examplesfor beam coverage of LEO and GEO satellites (Iridium, Viasat)
- Transparentvs. regenerative payload
- Orbits
- Lowearth orbot (LEO), medium earth orbit (MEO), geosynchroneous and geostationaryorbits (GEO), highly elliptical orbits (HEO
- Favourableorbits:
- HEOorbits with 63-64o inclination, Molnya and Tundra orbits
- CircularLEO orbits
- CircularMEO Orbits (Intermediate Circular Orbits (ICO))
- Equatorialorbits, geostationary orbit (GEO)
- Importantaspects of LEO, MEO and GEO satellites
- Kepler’slaws of planetary motion
- Gravitationalforce
- Parametersof ellipses and elliptical orbits
- Majorand minor half axis
- Foci
- Eccentricity
- Eccentricanomaly, mean anomaly, true anomaly
- Area
- Orbitperiod
- Perigee,apogee
- Distanceof satellite from center of earth
- Constructionof ellipses according to de La Hire
- Orbitalplane in space, inclination, right ascension (longitude) of ascending node,Vernal equinox
- Newton’slaws of motion
- Newton’suniversal law of gravitation
- Energyof satellites: Potential energy, kinetic energy, total energy
- Instantaneousspeed of a satellite
- Kepler’sequation
- Satellitevisibility, elevation
- Requirednumber of LEO, MEO or GEO satellites for continuous earth coverage
- Satellitealtitude and distance from a point on earth
- Choiceof orbits
- LEO,HEO, GEO
- Ellipticalorbits with non-zero inclination, Molnya orbits, Tundra orbits
- Geosynchronousorbits
- Parametersof geosynchronous orbits
- Circulargeosynchronous orbits
- Inclinedgeosynchronous orbits
- Quasi-zenithsatellite systems (QZSS)
- Syb-synchronouscircular equatorial orbits
- Geostationaryorbit
- Parametersof the geostationary orbit
- Visibility
- Propagationdelay
- Applicationsand system examples
- Perturbationsof orbits
- Stationkeeping
- Stationkeeping box
- Estimationof orbit parameters
- Fundamentalsof digital communications techniques
- Componentsof a digital communications system
- Principlesof encryption
- Scrambling
- Scramblingvs. interleaving for randomization of data sequences
- Interleaving:Block interleaver, convolutional interleaver, random interleaver
- Digitalmodulation methods
- Linearand non-linear digital modulation methods
- Lineardigital modulation methods
- QAMmodulator and demodulator
- Pulseshaping, square-root raised-cosine pulses
- Averagepower spectral density
- Signalspace constellation
- Examples:M-ary phase shift keying (M-PSK), M-ary quadrature amplitude shift keying (M-QAM)
- M-PSKin noisy channels
- Biterror probabilities of M-PSK and M-QAM
- M-PSKvs. M-QAM
- M-aryamplitude and phase shift keying (M-APSK)
- M-APSKvs. M-QAM
- Differentialphase shift keying (DPSK)
Errorcontrol coding (channel coding) - Errordetecting and forward error correcting (FEC) codes
- Principleof channel coding
- Datarate, code rate, Baud rate, spectral efficiency of modulation and codingschemes
- Bandwidth-powertrade-off, bandwidth-limited vs. power-limited transmission
- Codingand modulation for transparent vs. regenerative payload
- Blockcodes and convolutional codes
- Concatenatedcodes
- Bit-interleavedcoded modulation
- Convolutionalcodes
- Lowdensity parity check (LDPC) codes, principle of message passing decoding, biterror rate performance
- Cyclicblock codes
- Examplesfor cyclic block codes
- Singleerrors vs. block errors, cyclic block codes for burst errors
- Generatormatrix, generator polynomials
- Systematicencoding and syndrome determination with shift registers
- Cyclicredundancy check (CRC) codes
- Automaticrepeat request (ARQ)
- Principleof ARQ
- Stop-and-waitARQ
- Go-back-NARQ
- Selective-repeatARQ
- Transmissiongains and losses
- Antennagain
- Antennaradiation pattern
- Maximumantenna gain, 3dB beamwidth
- Maximumantenna gain of circular aperture
- Maximumantenna gain of a geostationary satellite with global coverage
- Effectiveisotropic radiated power (EIRP)
- Powerflux density
- Pathloss
- Freespace loss, free space loss for geostationary satellites
- Atmosphericloss
- Receivedpower
- Lossesin transmit and receive equipment
- Feederloss
- Depointingloss
- Polarizationmismatch loss
- Combinedeffect of losses
- Noise
- Originsof noise
- Whitenoise
- Noisepower spectral density and noise power
- Additivewhite Gaussian noise (AWGN) channel model
- Antennanoise temperature
- Earthbrightness temperature
- Signalto noise ratios
- Atmosphericdistortions
- Atmosphereof the earth: Troposphere, stratosphere, mesosphere, thermosphere, exosphere
- Attenuation and depolarization due to rain,fog, rain and ice clouds, sandstorms
- Scintillation
- Faradayeffect
- Multipathcontributions
- Linkbudget calculations
- GEOclear sky uplink and downlink
- GEOuplink and downlink under rain conditions
- Transparentvs. regenerative payload
- Linkavailability improvement through site diversity and adaptive transmission
- Transparentvs. regenerative payload
- Non-linearamplifiers
- Salehmodel, Rapp model
- Inputand output back-off factor
- Singlecarrier and multicarrier operation
- Dimensioningof transmission parameters
- Sourcesof noise: Thermal noise, interference, intermodulation products
- Signalto noise ratio and bit error probability
- Robustnessagainst interference and non-linear channels
- Satellitenetworks
- Satellitenetwork reference architectures
- Networktopologies
- Networkconnectivity
- Typesof network connectivity
- On-boardconnectivity
- Inter-satellitelinks
- Broadcastnetworks
- Satellite-basedinternet
- Satellitecommunications systems and standards examples
- Therole of standards in satellite communications
- TheDigital Video Broadcast Satellite Standard: DVB-S, DVB-S2, DVB-S2X
- Satellitesin 3GPP mobile communications networks
- LEOmegaconstellations: SpaceX Starlink, Kuiper, OneWeb
- Spacedebris
- TheGerman Heinrich Hertz mission
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| Leistungsnachweis: |
| m1700-2021 - Satellite Communications and Navigation<ul><li>p1651-2021 - Satellite Communications and Navigation: mündlich</li></ul> |
| ECTS-Kreditpunkte: |
| 6 |
| Weitere Informationen aus Stud.IP zu dieser Veranstaltung |
Heimatinstitut: Institut für Nachrichtentechnik (E-8)
In Stud.IP angemeldete Teilnehmer: 48
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