{"id":30915,"date":"2019-10-31T21:38:10","date_gmt":"2019-10-31T18:38:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/sravnenie-sistem-kosmicheskoj-svyazi\/"},"modified":"2019-10-31T21:38:10","modified_gmt":"2019-10-31T18:38:10","slug":"sravnenie-sistem-kosmicheskoj-svyazi","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/administrirovanie\/sravnenie-sistem-kosmicheskoj-svyazi","title":{"rendered":"Compararea sistemelor de comunica\u021bii spa\u021biale","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Prieteni, dup\u0103 cum \u0219ti\u021bi deja, ne preg\u0103tim cu viteza maxim\u0103 <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ruvds\/blog\/445648\/\">un nou proiect geek<\/a><\/noindex> \u2014 \u201eServer \u00een nori 2.0\u201d, sau \u201eData Center Spa\u021bial\u201d. \u00cen c\u00e2teva cuvinte: pe 12 aprilie vom lansa un server homemade pe un stratostat la o altitudine de aproximativ 30 km, vom transmite datele c\u0103tre acesta printr-un sistem de comunica\u021bie spa\u021bial\u0103, iar de pe server vom transmite informa\u021biile pe P\u0103m\u00e2nt prin intermediul unei leg\u0103turi radio. <\/p>\n<p>\u0218i ast\u0103zi dorim s\u0103 v\u0103 prezent\u0103m trei sisteme de comunica\u021bie spa\u021bial\u0103 pe care le vom testa \u00een proiectul nostru \u2014 Iridium, GlobalStar \u0219i \u201eGonie\u021b\u201d. Pentru aceasta, vom monta echipamente de recep\u021bie l\u00e2ng\u0103 serverul nostru cu adev\u0103rat \u00een nori.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ruvds\/blog\/446708\/\"><img decoding=\"async\" alt=\"Compararea sistemelor de comunica\u021bii spa\u021biale\" src=\"\/wp-content\/uploads\/2019\/04\/296f00ae31869ba5da5b47035a07a36e.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h1>o scurt\u0103 istorie<\/h1>\n<p>\nToate cele trei sisteme descrise au fost create \u0219i implementate aproximativ \u00een acela\u0219i timp, \u00een anii '90. Iridium din SUA este nu doar cea mai veche ca idee (lucr\u0103rile au \u00eenceput \u00een 1990), ci \u0219i cea mai extins\u0103 \u2014 ini\u021bial s-a planificat lansarea a 77 de sateli\u021bi, ceea ce corespunde num\u0103rului atomic al iridiumului, \u00eens\u0103 ast\u0103zi pe orbit\u0103 func\u021bioneaz\u0103 66 de sateli\u021bi (+ 6 rezerv\u0103). Utilizarea comercial\u0103 a sistemului a \u00eenceput \u00een 1998. \u00centr-un singur an, compania a reu\u0219it s\u0103 falimenteze, iar \u00een 2000 activele sale au fost cump\u0103rate de o companie care ac\u021biona \u00een interesul Ministerului Ap\u0103r\u0103rii din SUA. \u00cen 2001, utilizarea comercial\u0103 a fost reluat\u0103, iar \u00een 2009 proprietarul Iridium s-a schimbat din nou. De atunci, aceast\u0103 re\u021bea de comunica\u021bii prin satelit tr\u0103ie\u0219te \u0219i prosper\u0103.<\/p>\n<p>GlobalStar a fost de asemenea fondat\u0103 \u00een SUA, de\u0219i \u00een proiect sunt implicate corpora\u021bii din Fran\u021ba, Anglia, Germania \u0219i Coreea de Sud. Dezvoltarea grup\u0103rii de sateli\u021bi a \u00eenceput \u00een 1998, iar \u00een 2000 GlobalStar a fost lansat \u00een utilizare comercial\u0103. Aici nu a lipsit falimentul, re\u021beaua \u0219i-a schimbat proprietarul la \u00eenceputul anilor 2000. Ast\u0103zi, pe orbit\u0103 func\u021bioneaz\u0103 48 de sateli\u021bi GlobalStar (+ 4 rezerv\u0103). <\/p>\n<p>Sistemul rus \u201eGonie\u021b\u201d \u2014 un proiect ini\u021bial nu privat, ci de stat. Dezvoltarea sa a \u00eenceput \u00eenc\u0103 din 1989, iar lans\u0103rile primilor sateli\u021bi au \u00eenceput \u00een 1996. \u00cen mod ini\u021bial s-a planificat ca gruparea s\u0103 fie format\u0103 din 24 de sateli\u021bi, \u00eens\u0103 \u00een prezent sunt opera\u021bionali doar 12. \u00cen urm\u0103torii ani sunt planificate lans\u0103ri pentru \u00eenc\u0103 c\u00e2teva zeci de sateli\u021bi, inclusiv pentru \u00eenlocuirea celor \u00eenvechi\u021bi.<\/p>\n<h1>Caracteristici \u0219i capabilit\u0103\u021bi<\/h1>\n<p><\/p>\n<h3>Iridium<\/h3>\n<p>\nCea mai extins\u0103 acoperire cu cele mai mari viteze de transfer de date se g\u0103se\u0219te la Iridium. Sateli\u021bii s\u0103i orbiteaz\u0103 \u00een jurul P\u0103m\u00e2ntului la o altitudine de 780 km pe orbite cu o \u00eenclina\u021bie de 86,5o, acoperind cu semnal \u00eentreaga suprafa\u021b\u0103 a planetei, de la pol la pol. <\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"Xjig4NBAPZQ\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/Xjig4NBAPZQ\/hqdefault.jpg\" alt=\"Reda\u021bi video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><br \/>\n\u00cen prezent, viteza de transfer de date atinge ideal 352 Kbit\/s la Iridium, iar la sf\u00e2r\u0219itul anului se preconizeaz\u0103 c\u0103 va ajunge la 704\/352 Kbit\/s (primire \u0219i transmitere). Dar valorile reale sunt, desigur, mai mici. C\u00e2nd se comunic\u0103 vocal, calitatea sunetului nu este foarte bun\u0103, exist\u00e2nd distorsiuni. <\/p>\n<p><img decoding=\"async\" alt=\"Compararea sistemelor de comunica\u021bii spa\u021biale\" src=\"\/wp-content\/uploads\/2019\/04\/8fd6e3f4d0c4003a751fa0359a80741c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nIridium suport\u0103 comunica\u021bia direct\u0103 \u00eentre sateli\u021bi, astfel \u00eenc\u00e2t sistemul poate func\u021biona formal f\u0103r\u0103 numeroase sta\u021bii gateway \u00een diferite \u021b\u0103ri pentru a transmite date \u00een internet \u0219i \u00een re\u021beaua telefonic\u0103 terestr\u0103, spre deosebire de GlobalStar, \u0219i transmite tot traficul prin re\u021beaua de sateli\u021bi c\u0103tre sta\u021bia gateway central\u0103, situat\u0103 \u00een SUA. Totu\u0219i, probabil, pentru fiabilitatea comunica\u021biei, tot se construiesc sta\u021bii gateway, de\u0219i nu \u00een num\u0103r foarte mare.<\/p>\n<p>Telefoanele pentru Iridium sunt unele dintre cele mai scumpe de pe pia\u021b\u0103, de\u0219i sunt echipate bogat \u0219i au multe func\u021bionalit\u0103\u021bi. Sunt disponibile at\u00e2t modemuri mobile, c\u00e2t \u0219i dispozitive mobile pentru comunicarea prin text (considerabil mai ieftine dec\u00e2t comunicarea vocal\u0103). Pentru transferul de date prin Iridium, pe l\u00e2ng\u0103 telefon, este necesar un computer pe care se instaleaz\u0103 software-ul dedicat Iridium Data Kit. Serviciile de comunica\u021bie ale acestei re\u021bele prin satelit sunt mai costisitoare dec\u00e2t cele ale concuren\u021bei. De exemplu, un voucher anual pentru 250 de minute \u00een interiorul Rusiei cost\u0103 28.700 ruble, iar un voucher de dou\u0103 luni pentru 150 de minute \u00een \u00eentreaga lume cost\u0103 17.400 ruble. \u00cen tarifele post-plata, o minut\u0103 de conversa\u021bie cost\u0103 de la 58 ruble, SMS-ul \u2014 22 ruble, plus taxa de abonament de la 12.000 ruble (pentru mai pu\u021bin de \u0219ase luni) \u0219i de la 3.100 ruble (pentru mai mult de \u0219ase luni). \u0218i, \u00een plus, compania nu a \u00eencheiat \u00eenc\u0103 acorduri de roaming cu nimeni, a\u0219a c\u0103 nu se pot folosi cartelele SIM ale operatorilor GSM \u00een dispozitivele Iridium, ci doar cele \u201eoriginale\u201d.<\/p>\n<h3>GlobalStar<\/h3>\n<p>\nLa GlobalStar, sateli\u021bii zboar\u0103 la o altitudine de 1400 km \u0219i au o \u00eenclina\u021bie a orbitelor de 52o. Sateli\u021bii nu schimb\u0103 date \u00eentre ei, deci sistemul include \u0219i o re\u021bea de sta\u021bii gateway, care sunt elemente de leg\u0103tur\u0103 \u00eentre sateli\u021bii-retransmi\u021b\u0103tori, internet \u0219i re\u021beaua telefonic\u0103 terestr\u0103.<\/p>\n<p>Sateli\u021bii Iridium sunt marca\u021bi cu ro\u0219u, iar cei de la GlobalStar cu albastru:<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"t9dn48KXzks\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/t9dn48KXzks\/hqdefault.jpg\" alt=\"Reda\u021bi video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><br \/>\nGlobalStar ofer\u0103 o acoperire modest\u0103 \u2014 p\u00e2n\u0103 la 70o latitudine nordic\u0103 \u0219i sudic\u0103, ceea ce \u00eenseamn\u0103 c\u0103 zonele polare nu sunt acoperite de aceast\u0103 re\u021bea. Cu toate acestea, conform recenziilor, acoperirea poate fi instabil\u0103 \u0219i \u00een alte latitudini. Totu\u0219i, dac\u0103 satelitul este \u00een linie de vedere, nu ve\u021bi avea probleme de conexiune. Viteza de transfer a datelor la GlobalStar este mai mic\u0103 dec\u00e2t la Iridium, dar calitatea sunetului \u00een timpul apelurilor vocale este comparabil\u0103 cu o conversa\u021bie la un telefon mobil.<\/p>\n<p><img decoding=\"async\" alt=\"Compararea sistemelor de comunica\u021bii spa\u021biale\" src=\"\/wp-content\/uploads\/2019\/04\/926e08aec2d67871fbb53c9fef48d473.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nFormally, re\u021beaua suport\u0103 standardele CDMA \u0219i GSM, dar \u00een practic\u0103 nu toate sta\u021biile gateway func\u021bioneaz\u0103 cu GSM, de\u0219i pentru \u021bara noastr\u0103 acest aspect nu este relevant. \u00cen majoritatea \u021b\u0103rilor, este posibil s\u0103 insera\u021bi carduri SIM de la operatori de telefonie mobil\u0103 \u201eobi\u0219nui\u021bi\u201d \u00een telefoanele compatibile cu GlobalStar. Dispozitivele pentru GlobalStar sunt semnificativ mai ieftine dec\u00e2t cele pentru Iridium. Exist\u0103 telefoane de diferite niveluri de avansare \u00een v\u00e2nzare, gadgeturi pentru comunicare text cu tastatur\u0103 mecanic\u0103, hotspot-uri, tracking-uri pentru vehicule sau purtate personal \u0219i multe altele. Nu exist\u0103 abonament, iar tarifele pentru servicii sunt mai mici dec\u00e2t la Iridium: de exemplu, un pachet pentru apeluri \u00een RF pe o perioad\u0103 de \u0219ase luni \u0219i 250 de minute \u2014 9.800 ruble, \u00een tarifele postpl\u0103tite, minutul de la 44 ruble, SMS \u2014 4 ruble, acces la internet \u2014 de la 13 ruble.<\/p>\n<h3>\u0413\u043e\u043d\u0435\u0446<\/h3>\n<p>\nSatelitul acestui sistem orbiteaz\u0103 planeta la o \u00een\u0103l\u021bime de 1500 km pe orbite cu o \u00eenclinare de 82,5o. Ca urmare, acoperirea suprafe\u021bei P\u0103m\u00e2ntului este total\u0103, dar nu simultan.<\/p>\n<p><center><div class=\"youtube-placeholder\" data-id=\"7dF6WJwxyAg\" onclick=\"loadVideo(this)\">\r\n        <img decoding=\"async\" src=\"https:\/\/img.youtube.com\/vi\/7dF6WJwxyAg\/hqdefault.jpg\" alt=\"Reda\u021bi video\" loading=\"lazy\" width=\"480\" height=\"360\" style=\"width:100%;height:auto;\">\r\n        <div class=\"play-button\"><\/div>\r\n    <\/div><\/center><br \/>\nPe teritoriul Rusiei au fost construite 3 sta\u021bii gateway (iar una este planificat\u0103), care leag\u0103 constela\u021bia de sateli\u021bi de internet.<\/p>\n<p><img decoding=\"async\" alt=\"Compararea sistemelor de comunica\u021bii spa\u021biale\" src=\"\/wp-content\/uploads\/2019\/04\/f2e8dce5b0f9e1c2b19a43bfd93be39e.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEste interesant c\u0103 \u00ab\u0413\u043e\u043d\u0435\u0446\u00bb nu concureaz\u0103 cu alte sisteme \u00een domeniul apelurilor vocale. \u00cen schimb, proiectul rus se specializeaz\u0103 \u00een transmiterea mesajelor text. Pentru aceasta, trebuie s\u0103 achizi\u021biona\u021bi un dispozitiv de abonament \u0219i o anten\u0103, \u0219i s\u0103 le conecta\u021bi la un smartphone, laptop sau computer desktop. Pe scurt, un vis pentru introver\u021bi \u2014 toat\u0103 comunicarea doar \u00een chat \u0219i f\u0103r\u0103 nici un apel surpriz\u0103.<\/p>\n<p><img decoding=\"async\" alt=\"Compararea sistemelor de comunica\u021bii spa\u021biale\" src=\"\/wp-content\/uploads\/2019\/04\/9e9b1a3d664e9bbd4492898b82b31f5f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDe asemenea, \u00ab\u0413\u043e\u043d\u0435\u0446\u00bb ofer\u0103 servicii de comunicare M2M pentru monitorizarea automat\u0103 a st\u0103rii \u0219i preluarea telemetriei diverselor obiecte, at\u00e2t sta\u021bionare, c\u00e2t \u0219i mobile.<\/p>\n<p><img decoding=\"async\" alt=\"Compararea sistemelor de comunica\u021bii spa\u021biale\" src=\"\/wp-content\/uploads\/2019\/04\/143b49b2e13718b8bca2adfc9befb4f7.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u0218i \u00een plus, servicii suplimentare precum retransmisia geocoordonatelor vehiculului \u0219i trimiterea de notific\u0103ri. <\/p>\n<p>Serviciile de comunica\u021bie \u00een re\u021bea sunt pl\u0103tite pe baz\u0103 de abonament \u2014 \u00een esen\u021b\u0103, acestea sunt pachete lunare prepl\u0103tite de kilobi\u021bi de trafic. De exemplu, pentru un abonament zero, se percep 26 lei pentru fiecare kilobit de date transmise, iar exist\u0103 o gam\u0103 \u00eentreag\u0103 de pachete, de la 470 lei (30 Kb) p\u00e2n\u0103 la 8 650 lei (2 000 Kb). \u00cen plus, se adaug\u0103 10 lei pentru fiecare mesaj trimis c\u0103tre re\u021belele mobile din Rom\u00e2nia. Fiecare kilobit dep\u0103\u0219it se pl\u0103te\u0219te separat, \u00eentre 11 \u0219i 26 lei. <\/p>\n<h1>Ce s\u0103 alegem?<\/h1>\n<p>\nDorim s\u0103 dot\u0103m serverul \u201e\u00een nori\u201d cu un tracker pentru urm\u0103rirea loca\u021biei \u0219i un modul pentru schimbul de date prin satelit. Teoretic, aceste func\u021bii pot fi oferite de toate cele trei re\u021bele. Am achizi\u021bionat deja modemuri Iridium \u0219i GlobalStar, iar dispozitivul de la \u201eGon\u021ba\u201d este pe drum. Vom \u00eemp\u0103rt\u0103\u0219i detalii suplimentare despre sistemul nostru de comunica\u021bie \u00een una dintre publica\u021biile viitoare.<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/12.ruvds.com\/\"><img decoding=\"async\" alt=\"Compararea sistemelor de comunica\u021bii spa\u021biale\" src=\"\/wp-content\/uploads\/2019\/04\/8f97dd64736b9bf4c1e4a5bf121445af.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/p>\n<p>\u00centre timp, v\u0103 invit\u0103m <noindex><a rel=\"nofollow\" href=\"https:\/\/12.ruvds.com\/\">s\u0103 participa\u021bi<\/a><\/noindex> la experimentul nostru, s\u0103 ghici\u021bi punctul de aterizare al sondei \u0219i s\u0103 c\u00e2\u0219tiga\u021bi marele premiu \u2013 o c\u0103l\u0103torie la Baikonur.<\/p>\n<p>Nu ne p\u0103r\u0103si\u021bi!<\/p>\n<p><noindex><a rel=\"nofollow\" href=\"https:\/\/ruvds.com\/ru-rub\/#order\"><img decoding=\"async\" alt=\"Compararea sistemelor de comunica\u021bii spa\u021biale\" src=\"\/wp-content\/uploads\/2019\/04\/392da47c30371107afa35e5d28c256e6.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><br \/>\n<br \/>Sursa: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/ruvds\/blog\/446708\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u0440\u0443\u0437\u044c\u044f, \u043a\u0430\u043a \u0432\u044b \u0443\u0436\u0435 \u0437\u043d\u0430\u0435\u0442\u0435, \u043c\u044b \u043d\u0430 \u0432\u0441\u0435\u0445 \u043f\u0430\u0440\u0430\u0445 \u0433\u043e\u0442\u043e\u0432\u0438\u043c \u043d\u043e\u0432\u044b\u0439 \u0433\u0438\u043a-\u043f\u0440\u043e\u0435\u043a\u0442 \u2014 \u00ab\u0421\u0435\u0440\u0432\u0435\u0440 \u0432 \u043e\u0431\u043b\u0430\u043a\u0430\u0445 2.0\u00bb, \u0438\u043b\u0438 \u00ab\u041a\u043e\u0441\u043c\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0426\u041e\u0414\u00bb. \u0412 \u0434\u0432\u0443\u0445 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