{"id":42137,"date":"2019-03-18T00:00:00","date_gmt":"2019-03-17T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/flightradar24-kak-eto-rabotaet"},"modified":"2020-02-18T13:44:56","modified_gmt":"2020-02-18T10:44:56","slug":"flightradar24-kak-eto-rabotaet","status":"publish","type":"post","link":"https:\/\/prohoster.info\/no\/blog\/news\/flightradar24-kak-eto-rabotaet","title":{"rendered":"Flightradar24 \u2014 hvordan fungerer det?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Sannsynligvis har alle som noen gang har m\u00f8tt eller tatt farvel med slektninger eller venner p\u00e5 flyplassen, brukt den gratis tjenesten Flightradar24. Dette er en sv\u00e6rt praktisk m\u00e5te \u00e5 spore flyets posisjon i sanntid.<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/46ac95387b5ebe4f996bbc4bc1eb7b3f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSom en unders\u00f8kelse blant kjente har vist, er det veldig f\u00e5 som vet at denne tjenesten kun st\u00f8ttes av entusiaster som sender data til serveren. Enda f\u00e6rre vet at alle som \u00f8nsker det, kan bli med i prosjektet.<\/p>\n<p>La oss fylle dette gapet. Om hvordan det fungerer, fortsetter vi under.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Jern<\/h2>\n<p>\nDet f\u00f8rste sp\u00f8rsm\u00e5let er \u2014 hvor kommer dataene fra? <\/p>\n<p>Hvert sivilt fly er utstyrt med en spesialsender, s\u00e5kalt <b>ADS-B transponder<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/ce3a5ddc8b9a1aa17f003ca8739913ba.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>(foto fra Garmin sin nettside)<\/i><\/p>\n<p>Denne enheten sender spesielle meldinger p\u00e5 1090 MHz som inneholder de viktigste flyparameterne, typen luftfart\u00f8y, koordinatene, destinasjonen osv. <\/p>\n<p>Signalet p\u00e5 spekteret ser omtrent slik ut:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/3d084a88bbdf55c8a0f494e9fa832b42.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOg det viktigste for oss, \u00e5 dekode disse dataene er ikke vanskelig, det er tilstrekkelig med en RTL-SDR-mottaker som koster rundt 8$, koblet til en datamaskin. Egentlig er ideen allerede klar \u2014 hvis man samler data fra mange mottakere, vil man f\u00e5 et bilde som i hovedsak ser slik ut:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/351c8855fa9473e424fac9167c4d0b2c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMen det er ikke alt. Noen fly sender datapakker, men inneholder ikke GPS-koordinater. Hvis man mottar data samtidig fra mange mottakere, hvis koordinater er kjent, kan man ved \u00e5 analysere forsinkelsene p\u00e5 de forskjellige mottakerne finne ut posisjonen til luftfart\u00f8yet. Denne teknologien kalles multilaterasjon (MLAT), mer om dette kan man lese <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/blog\/how-we-track-flights-with-mlat\/\">p\u00e5 nettstedet<\/a><\/noindex>.<\/p>\n<p>Og til slutt, det siste sp\u00f8rsm\u00e5let \u2014 hvordan blir dataene mottatt? Svaret er enkelt, enhver som \u00f8nsker det kan plassere en mottaker, prisen ligger mellom 0 og 50 $. For eksempel ser kartet over Flightaware-mottakere slik ut:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/d62f720231ff90caa4e652355b4270fa.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSom man kan se, er dekningen i den russiske delen ikke best, s\u00e5 noen har absolutt sjansen til \u00e5 bli den f\u00f8rste.<\/p>\n<p>For \u00e5 motta data er det n\u00f8dvendig med:<\/p>\n<p> \u2014 Raspberry Pi2\/3 med internettforbindelse (pris fra 20 $)<br \/>\n \u2014 RTL-SDR-dongle (pris fra 10 $)<br \/>\n \u2014 minst en enkel antenne laget av 2 biter ledning som hver er 6,8 cm lange (1\/4 dipol for 1090 MHz)<\/p>\n<p>Det er ogs\u00e5 \u00f8nskelig med et sted med et mer eller mindre \u00e5pent utsyn til minst en del av himmelen, siden signaler p\u00e5 gigahertzs frekvens blir absorbert av hindringer som hus eller tr\u00e6r.<\/p>\n<p>Jeg hadde b\u00e5de Raspberry Pi og RTL-SDR, s\u00e5 jeg m\u00e5tte ikke kj\u00f8pe noe. Men hvem som helst kan pr\u00f8ve \u00e5 f\u00e5 en ferdig mottaker gratis \u2014 b\u00e5de Flightradar og Flightaware sender ut sett gratis til brukere i omr\u00e5der hvor dekning for \u00f8yeblikket er utilstrekkelig. Du kan sende en foresp\u00f8rsel via linken (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/apply-for-receiver\">Flightradar<\/a><\/noindex> eller <noindex><a rel=\"nofollow\" href=\"http:\/\/uk.flightaware.com\/adsb\/request\">Flightaware<\/a><\/noindex>), selvf\u00f8lgelig er det fornuftig \u00e5 pr\u00f8ve for de som bor i relativt avsidesliggende omr\u00e5der.<\/p>\n<p>Jeg brukte et sett med RTL-SDR V3, som sammen med antennen og mini-stativet kostet 27 $ med gratis frakt fra Kina:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/21527717b93d546ddc2d6b9a694fabab.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nForresten, som et ekstra bonus, gir b\u00e5de Flightradar24 og Flightaware alle som sender data til serveren <b>ubegrenset tilgang til premium-kontoen<\/b> og alle serverfunksjoner (separat koster slik tilgang omtrent 50 $\/m\u00e5ned). S\u00e5 hvis noen er interessert i luftfart og \u00f8nsker \u00e5 ha utvidet tilgang til en slik konto, er installasjonen av RTLSDR-mottakeren en rimelig alternativ. <\/p>\n<h2>Testing<\/h2>\n<p>\nInstalleringen er ekstremt enkel; p\u00e5 Raspberry Pi er det bare \u00e5 koble til mottakeren og kj\u00f8re \u00e9n kommando:<\/p>\n<pre><code class=\"bash\">sudo bash -c \"$(wget -O - http:\/\/repo.feed.flightradar24.com\/install_fr24_rpi.sh)\"<\/code><\/pre>\n<p>\nSkriptet vil be om n\u00f8dvendige data (koordinater og type mottaker, e-postadresse), deretter vil programvaren kj\u00f8re automatisk, og brukeren trenger ikke mer oppmerksomhet. Samtidig kan du aktivere premium-kontoen (for FR24 via linken <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/premium\/signup?account=free\">https:\/\/www.flightradar24.com\/premium\/signup?account=free<\/a><\/noindex>) og bruke alle mulighetene som f\u00f8lger med den (flyspor osv.).<\/p>\n<p>Du kan g\u00e5 til IP-adressen til Raspberry Pi og se dagens status:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/acae0206cf4de6c1bb980679efd46631.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nDu kan se mye mer informasjon p\u00e5 Flightradar24-kontoens side:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/b683667ba760466f2915312cb0804556.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nJeg bor i sjette etasje ganske n\u00e6rt flyplassen, s\u00e5 antallet observerte fly per dag var over 1000, selv med en enkel antenne p\u00e5 vinduet. Interessant nok var den maksimale avstanden til det mottatte flyet 215 miles selv med en slik antenne. Ulike antennealternativer kan finnes p\u00e5 eBay ved \u00e5 s\u00f8ke etter ADS-B antenne.<\/p>\n<h2>Alternativ<\/h2>\n<p>\nBonus for de som hadde t\u00e5lmodighet til \u00e5 lese hit. Noen lesere kan sp\u00f8rre: er det mulig \u00e5 klare seg uten tredjeparts tjenester som Flightradar? Selvf\u00f8lgelig er det mulig, ved \u00e5 kj\u00f8re dekoderen p\u00e5 Raspberry Pi direkte. Du kan laste ned kildene fra adressen <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/antirez\/dump1090\">github.com\/antirez\/dump1090<\/a><\/noindex>.<\/p>\n<p>Det er nok \u00e5 skrive tre kommandoer p\u00e5 Raspberry Pi:<\/p>\n<pre><code class=\"bash\">git clone https:\/\/github.com\/antirez\/dump1090.git\ncd dump1090\/\nmake<\/code><\/pre>\n<p>\nDeretter kan dekoderen startes med kommandoen:<\/p>\n<pre><code class=\"bash\">.\\\/dump1090 --interactive --net<\/code><\/pre>\n<p>\nDekoderen begynner \u00e5 jobbe, og vi ser \" r\u00e5data \" \u2014 listen over synlige \"bord\":<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/20b9d9c175260e635cc4a609707bb058.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nN\u00e5 kan vi g\u00e5 inn i nettleseren p\u00e5 Raspberry Pi og beundre v\u00e5r egen, lokale Flightradar, bildet kan se omtrent slik ut:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/c7369e9cdc13b2ff36996cb51e959f9c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nHvorfor kan dette v\u00e6re n\u00f8dvendig? For det f\u00f8rste, bare av interesse, for det andre, Flightradar24 filtrerer dessverre ut en del data og viser <i>ikke alle<\/i> fly (for eksempel kan milit\u00e6re, regjerings-, eller forretningsfly ikke vises). Ved \u00e5 starte v\u00e5r egen lokale tjeneste, ser vi alt \" som det er \", uten noen form for sensur. Men selvf\u00f8lgelig er datamengden begrenset til v\u00e5r lokale plassering og kvaliteten p\u00e5 antennen, og MLAT-teknologien vil heller ikke v\u00e6re tilgjengelig. Dump1090 er tilgjengelig i kildekode, s\u00e5 de som er interesserte kan til og med lage sin egen versjon av Flightradar, med blackjack og andre bells and whistles.<\/p>\n<h2>Konklusjoner<\/h2>\n<p>\nSom man kan se, er ikke alt s\u00e5 vanskelig, samtidig som det er ganske interessant og rimelig. For \u00e5 forst\u00e5 prisklassen: for 10 \u00e5r siden kostet Airnav RadarBox-mottakeren omtrent 1000$, n\u00e5 kan RTL-SDR, som gj\u00f8r det samme, f\u00e5s for 10$.<\/p>\n<p>I mitt tilfelle ble mottakeren bare startet for testing, det er ikke s\u00e6rlig praktisk \u00e5 ha den kontinuerlig p\u00e5, dekningen av den europeiske delen er allerede 100%. For folk som bor i dype Russland, kan dette derimot v\u00e6re ganske interessant \u2014 det \u00e5pner muligheten for b\u00e5de \u00e5 gj\u00f8re noe nyttig for flyreisende over hele verden, ved \u00e5 utvide dekningen, og \u00e5 f\u00e5 tilgang til Premium-kontoen til de nevnte nettstedene.<\/p>\n<p>Lykke til med eksperimentene.<\/p>\n<p>Kilde: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/408003\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0430\u0432\u0435\u0440\u043d\u043e\u0435 \u043a\u0430\u0436\u0434\u044b\u0439, \u043a\u0442\u043e \u0445\u043e\u0442\u044c \u0440\u0430\u0437 \u0432\u0441\u0442\u0440\u0435\u0447\u0430\u043b \u0438\u043b\u0438 \u043f\u0440\u043e\u0432\u043e\u0436\u0430\u043b \u0440\u043e\u0434\u0441\u0442\u0432\u0435\u043d\u043d\u0438\u043a\u043e\u0432 \u0438\u043b\u0438 \u0434\u0440\u0443\u0437\u0435\u0439 \u043d\u0430 \u0441\u0430\u043c\u043e\u043b\u0435\u0442, \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043b\u0441\u044f \u0431\u0435\u0441\u043f\u043b\u0430\u0442\u043d\u044b\u043c \u0441\u0435\u0440\u0432\u0438\u0441\u043e\u043c Flightradar24. \u042d\u0442\u043e \u0432\u0435\u0441\u044c\u043c\u0430 \u0443\u0434\u043e\u0431\u043d\u044b\u0439 \u0441\u043f\u043e\u0441\u043e\u0431 \u043e\u0442\u0441\u043b\u0435\u0436\u0438\u0432\u0430\u043d\u0438\u044f \u043f\u043e\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u0441\u0430\u043c\u043e\u043b\u0435\u0442\u0430 \u0432 \u0440\u0435\u0430\u043b\u044c\u043d\u043e\u043c \u0432\u0440\u0435\u043c\u0435\u043d\u0438. \u041a\u0430\u043a \u043f\u043e\u043a\u0430\u0437\u0430\u043b \u043e\u043f\u0440\u043e\u0441 \u0437\u043d\u0430\u043a\u043e\u043c\u044b\u0445, \u043e\u0447\u0435\u043d\u044c \u043c\u0430\u043b\u043e \u043a\u0442\u043e \u0437\u043d\u0430\u0435\u0442, \u0447\u0442\u043e \u044d\u0442\u043e\u0442 \u0441\u0435\u0440\u0432\u0438\u0441 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043b\u0438\u0448\u044c \u044d\u043d\u0442\u0443\u0437\u0438\u0430\u0441\u0442\u0430\u043c\u0438, \u043e\u0442\u043f\u0440\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u043c\u0438 \u043d\u0430 \u0441\u0435\u0440\u0432\u0435\u0440 \u0434\u0430\u043d\u043d\u044b\u0435. \u0415\u0449\u0435 \u043c\u0435\u043d\u044c\u0448\u0435 \u0437\u043d\u0430\u044e\u0442, \u0447\u0442\u043e \u043f\u0440\u0438\u0441\u043e\u0435\u0434\u0438\u043d\u0438\u0442\u044c\u0441\u044f \u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0443 \u043c\u043e\u0436\u0435\u0442 \u043b\u044e\u0431\u043e\u0439 \u0436\u0435\u043b\u0430\u044e\u0449\u0438\u0439. 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