Kommunikatsiooniteenuste arendus IRT0080 Loeng 5/2013 Satelliitside teenused Avo Ots telekommunikatsiooni õppetool TTÜ raadio- ja sidetehnika instituut avo.ots@ttu.ee 1
Võrdlus teiste sideviisidega 2
Satelliitside kui tööstusharu 3
Veebimaterjale http://www.globalcomsatphone.com/ http://www.iridium.com/about/industryleadership/fastfacts.aspx http://investor.iridium.com/releases.cfm http://en.wikipedia.org/wiki/iridium_satellite_constellation http://en.wikipedia.org/wiki/iridium_flares http://www.satphoneusa.com/iridium/network.html http://www.rod.sladen.org.uk/iridium.htm
5 Communication Satellites
G E O At the Geostationary orbit the satellite covers 42.2% of the earth s surface. Theoretically 3 geostaionary satellites provides 100% earth coverage
7 Satellite Bands
I-4
Asukohad
Satellite telephony 2.4kbps voice codec Speakerphone option Voicemail Speed dial 1 Supplementary services Call history Caller ID Call waiting Call divert Call holding Conferencing Call barring Speed dialling Fixed number dialling Põhifunktsioonid
Inmarsat terminal 11
Messaging services Text-to-text Text-to-email Email-to-text Web messageto-text Description IsatPhone-to- IsatPhone other MSS cellular Standard and predictive text IsatPhone-toemail Standard and predictive text Email-to- IsatPhone Message from inmarsat.com to IsatPhone Message length 160 Latin characters ~74 non-latin characters Up to 10 concatenations 160 Latin characters ~74 non-latin characters Up to 10 concatenations Truncates to: 160 Latin characters ~74 non-latin characters 160 characters Charging Per message Per message No charge No charge
Competitive comparison Inmarsat Iridium Thuraya Product / Model IsatPhone Pro 9555 XT Coverage Global Global 140+ countries Size (H x W x D) 170 x 54 x 39 mm 143 x 55 x 30 mm 128 x 53 x 26.5 mm Weight 279 gms 266 gms 193 gms Talk time Up to 8 hours Up to 4 hours Up to 6 hours Standby time Up to 100 hours Up to 30 hours Up to 80 hours Ingress Protection IP54 n/a IP54 Operating range -20ºC to +55ºC n/a -10ºC to +55ºC Voice service Satellite telephony Satellite telephony Satellite telephony Messaging services Text-to-text (1600 characters) Text-to-email (1600 characters) Web message-to-satphone Text-to-text (1000 characters) Text-to-email (1000 characters) Web message-to-satphone Text-to-text (multi-page) Text-to-email (multi-page) Web message-to-satphone Data services Circuit switched: 2.4kbps (before compression) Planned for Q1 2011 Circuit switched: 9.6kbps (with compression) GPRS: Up to 60/15 kbps Circuit switched: 9.6kbps Interfaces Micro USB, audio socket, external antenna port, Bluetooth Mini USB, audio socket, external antenna port, DC charger Proprietary USB, audio socket, external antenna port, DC charger Languages supported 8 21 12
THURAYA
Kuidas arvutada Parameter Value Totals Units Parameter Value Totals Units Frequency 11.75 GHz Transmitter Receive Antenna Transmitter Power 40.00 dbm Random Loss 0.50 db Modulation Loss 3.00 db Diameter 1.5 m Transmission Line Loss 0.75 db Aperture Efficiency 0.6 none Transmitted Power 36.25 dbm Gain 43.10 dbi Polarization Loss 0.20 db Transmit Antenna Effective RX Ant. Gain 42.40 db Diameter 0.5 m Aperture Efficiency 0.55 none Received Power -98.54 dbm Transmit Antenna Gain 33.18 dbi Slant Path Summary Satellite Altitude 35,786 km Transmitted Power 36.25 dbm Elevation Angle 14.5 degrees Transmit Anntenna 33.18 dbi Gain Slant Range 41,602 km EIRP 69.43 dbmi Free-space Path Loss 206.22 db Path Loss 210.37 db Gaseous Loss 0.65 db Effective RX 42.4 dbi Antenna Gain Rain Loss (allocated) 3.50 db Received Power -98.54 dbm Path Loss 210.37 db
Sagedusjaotus ITU-R SHARING Economical Protection Political Issues 16
Contour plot of the spot beam of ESA s OTS satellite projected onto the earth. The contours are in 1 db steps, normalized to 0 db at the center of the beam. Signaali jaotus (DBS)
Maksumus
ITU-R soovitused BO: Satellite delivery BR: Recording for production, archival and play-out; film for television BS: Broadcasting service (sound) BT: Broadcasting service (television) F: Fixed service M: Mobile, radiodetermination, amateur and related satellite services P: Radiowave propagation RA: Radio astronomy RS: Remote sensing systems S: Fixed-satellite service SA: Space applications and meteorology SF: Frequency sharing and coordination between fixed-satellite and fixed service systems SM: Spectrum management SNG: Satellite news gathering TF: Time signals and frequency standards emissions V: Vocabulary and related subjects 19
VSAT maksumus 20
Ajalugu (Iridium näitel) 5. mail 1997 saadeti esimene satelliit orbiidile Avalik teenus käivitati 1. november 1998 Esimese kõne tegi USA asepresident Al Gore 13. augustil 1999 anti sisse pankrotiavaldus Esialgne projekt läks hinnanguliselt maksma 6 miljardit dollarit ning müüdi edasi 25 miljoni eest Teenus taaskäivitati 2001 aastal uute investorite toel
Tehnoloogia 66 satelliiti asuvad 11 kaupa 6 orbitaaltasandil Iga satelliit teeb täisringi ümber Maa 100 minutiga Teenuse toimimiseks on vajalik otsevaade satelliitidega ning selletõttu ei tööta hästi siseruumides, metsas ja muudes varjatud kohates Kõige töökindlam satelliitsidelahendus, eelkõige satelliitide suure arvu tõttu
Cross-linked satellites
Low-Earth Orbit Satellites Iridium (a) The Iridium satellites from six necklaces around the earth. 24 (b) 1628 moving cells cover the earth.
Veebilinke lisaks http://www.iridium.com/default.aspx http://www.inmarsat.com/ http://en.wikipedia.org/wiki/intelsat_i http://en.wikipedia.org/wiki/iridium_communicati ons_inc 25