{"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\/da\/blog\/news\/flightradar24-kak-eto-rabotaet","title":{"rendered":"Flightradar24 \u2013 hvordan fungerer det?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Sandsynligvis har enhver, der har hilst p\u00e5 eller sagt farvel til sl\u00e6gtninge eller venner p\u00e5 en flyvning, brugt den gratis tjeneste Flightradar24. Det er en meget praktisk m\u00e5de at spore flyets placering i realtid p\u00e5.<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/46ac95387b5ebe4f996bbc4bc1eb7b3f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSom en unders\u00f8gelse blandt venner viste, er der meget f\u00e5, der ved, at denne tjeneste kun underst\u00f8ttes af entusiaster, der sender data til serveren. Endnu f\u00e6rre ved, at enhver, der \u00f8nsker det, kan deltage i projektet.<\/p>\n<p>Lad os udfylde dette hul. Hvordan det fungerer, vil vi forts\u00e6tte med under indl\u00e6gget.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Hardware<\/h2>\n<p>\nDet f\u00f8rste sp\u00f8rgsm\u00e5l er \u2014 hvor kommer dataene fra. <\/p>\n<p>Hvert civilfly er udstyret med en speciel transponder, ogs\u00e5 kaldet <b>ADS-B transponder<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/ce3a5ddc8b9a1aa17f003ca8739913ba.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>(billede fra Garmin's hjemmeside)<\/i><\/p>\n<p>Denne enhed sender p\u00e5 frekvensen 1090 MHz specielle pakker, der indeholder de vigtigste parametre for flyvningen, typen af luftfart\u00f8j, dets koordinater, destination og s\u00e5 videre. <\/p>\n<p>Signalet i spektret ser cirka s\u00e5dan her ud:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/3d084a88bbdf55c8a0f494e9fa832b42.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOg hvad der er vigtigst for os, er, at det ikke er sv\u00e6rt at afkode disse data; det kr\u00e6ver blot en RTL-SDR-modtager, der koster omkring 8 $, tilsluttet en computer. Id\u00e9en er allerede formentlig klar \u2014 hvis man indsamler data fra mange modtagere, f\u00e5r man et billede, der ser nogenlunde s\u00e5dan her ud:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 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. Nogle fly sender datapakker, men disse indeholder ikke GPS-koordinater. Hvis man modtager data samtidig fra mange modtagere, hvis koordinater er kendt, kan man ved at analysere forsinkelserne p\u00e5 de forskellige modtagere finde luftfart\u00f8jernes placering. Denne teknologi kaldes multilateration (MLAT), og man kan l\u00e6se mere om den. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/blog\/how-we-track-flights-with-mlat\/\">hjemmeside<\/a><\/noindex>.<\/p>\n<p>Og endelig, det sidste sp\u00f8rgsm\u00e5l \u2014 hvordan modtages dataene. Svaret er enkelt; enhver, der \u00f8nsker det, kan placere en modtager hos sig selv, og prisen for at g\u00f8re det ligger mellem 0 og 50 $. For eksempel ser kortet over modtagere fra Flightaware s\u00e5dan her ud:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 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 d\u00e6kningen i den russiske del ikke den bedste, s\u00e5 nogle har helt klart chancen for at v\u00e6re de f\u00f8rste.<\/p>\n<p>For at modtage data kr\u00e6ves:<\/p>\n<p> \u2014 Raspberry Pi 2\/3 med internetforbindelse (pris fra 20 $)<br \/>\n \u2014 RTL-SDR-dongle (pris fra 10 $)<br \/>\n \u2014 mindst en simpel antenne lavet af 2 stykker ledning p\u00e5 6,8 cm hver (1\/4 dipol ved 1090 MHz)<\/p>\n<p>Det er ogs\u00e5 \u00f8nskeligt at have et sted med en nogenlunde \u00e5ben udsigt til dele af himlen, da signaler i gigahertzfrekvenser bliver absorberet af forhindringer som bygninger eller tr\u00e6er.<\/p>\n<p>Jeg havde b\u00e5de en Raspberry Pi og en RTL-SDR, s\u00e5 jeg havde ikke brug for at k\u00f8be noget. Men enhver kan gratis pr\u00f8ve at f\u00e5 en f\u00e6rdig modtager \u2014 b\u00e5de Flightradar og Flightaware sender gratis s\u00e6t til brugere i de omr\u00e5der, hvor d\u00e6kningen lige nu er utilstr\u00e6kkelig. Du kan sende en anmodning via linket (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/apply-for-receiver\">Flightradar<\/a><\/noindex> eller <noindex><a rel=\"nofollow\" href=\"http:\/\/uk.flightaware.com\/adsb\/request\">Flightaware<\/a><\/noindex>), selvf\u00f8lgelig er det fornuftigt at pr\u00f8ve for dem, der bor i tilstr\u00e6kkeligt afsides omr\u00e5der.<\/p>\n<p>Jeg brugte et s\u00e6t med RTL-SDR V3, som sammen med en antenne og et mini-stativ kostede 27$ med gratis levering fra Kina:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/21527717b93d546ddc2d6b9a694fabab.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nForresten, som et andet bonus, giver b\u00e5de Flightradar24 og Flightaware alle, der sender data til serveren, <b>ubegr\u00e6nset adgang til premium-kontoen<\/b> og alle serverens funktioner (adgang til s\u00e5dan en koster normalt omkring 50$ i m\u00e5neden). S\u00e5 hvis nogen er interesseret i luftfart og \u00f8nsker udvidet adgang til en s\u00e5dan konto, er installationen af en RTLSDR-modtager en ret billig l\u00f8sning. <\/p>\n<h2>Testning<\/h2>\n<p>\nInstallation er ganske enkel, p\u00e5 Raspberry Pi skal du blot tilslutte modtageren og k\u00f8re en 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>\nScriptet vil anmode om de n\u00f8dvendige oplysninger (koordinater og type modtager, e-mailadresse), herefter vil softwaren k\u00f8re automatisk, og brugeren skal ikke l\u00e6ngere v\u00e6re opm\u00e6rksom. Du kan samtidig aktivere premium-kontoen (for FR24 via linket <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/premium\/signup?account=free\">https:\/\/www.flightradar24.com\/premium\/signup?account=free<\/a><\/noindex>) og straks bruge alle dets funktioner (flyspor osv.).<\/p>\n<p>Du kan g\u00e5 til IP-adressen p\u00e5 Raspberry Pi og se den nuv\u00e6rende status:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/acae0206cf4de6c1bb980679efd46631.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nMeget mere information kan ses p\u00e5 Flightradar24-kontoen:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/b683667ba760466f2915312cb0804556.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nJeg bor p\u00e5 6. sal relativt t\u00e6t p\u00e5 lufthavnen, s\u00e5 antallet af observerede fly om dagen var mere end 1000, selv med en simpel antenne p\u00e5 vinduet. Det er interessant, at selv med en s\u00e5dan antenne var den maksimale r\u00e6kkevidde til det modtagne fly 215 miles. Forskellige antennevarianter kan findes p\u00e5 ebay ved at s\u00f8ge p\u00e5 ads-b antenne.<\/p>\n<h2>Alternativ<\/h2>\n<p>\nBonus til dem, der har haft t\u00e5lmodighed til at l\u00e6se til her. Nogle l\u00e6sere m\u00e5tte m\u00e5ske sp\u00f8rge: kan man undv\u00e6re tredjeparts tjenester som Flightradar? Selvf\u00f8lgelig kan man, man kan starte en dekoder p\u00e5 Raspberry Pi direkte. Kildekoderne kan downloades p\u00e5 adressen <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/antirez\/dump1090\">github.com\/antirez\/dump1090<\/a><\/noindex>.<\/p>\n<p>Bare skriv 3 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>\nDerefter kan dekoderen startes med kommandoen:<\/p>\n<pre><code class=\"bash\">.\\\/dump1090 --interactive --net<\/code><\/pre>\n<p>\nDekoderen begynder at arbejde, og vi ser \"r\u00e5 data\" \u2014 en liste over synlige \"fly\":<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/20b9d9c175260e635cc4a609707bb058.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNu kan man g\u00e5 ind i browseren p\u00e5 Raspberry Pi og beundre sit eget, lokale Flightradar, billedet kan se nogenlunde s\u00e5dan ud:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2013 hvordan fungerer det?\" src=\"\/wp-content\/uploads\/2019\/03\/c7369e9cdc13b2ff36996cb51e959f9c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nHvorfor kunne dette v\u00e6re n\u00f8dvendigt? For det f\u00f8rste ud af ren interesse, for det andet filtrerer Flightradar24 desv\u00e6rre en del data og viser <i>ikke alle<\/i> fly (for eksempel kan milit\u00e6re, regerings- eller business-jets v\u00e6re usynlige). Ved at starte en egen lokal tjeneste ser vi alt, \"som det er\", uden nogen former for censur. Dog er datam\u00e6ngden naturligvis begr\u00e6nset af vores lokale placering og kvaliteten af antennen, og teknologien MLAT vil desuden ikke v\u00e6re tilg\u00e6ngelig. Dump1090 er tilg\u00e6ngelig i kildekoden, s\u00e5 interesserede kan endda lave deres egen version af Flightradar, med blackjack og andre l\u00e6kkerier.<\/p>\n<h2>Konklusioner<\/h2>\n<p>\nSom man kan se, er alt ikke s\u00e5 kompliceret, og det er faktisk ganske interessant og billigt. For at forst\u00e5 prisniveauet: for 10 \u00e5r siden kostede Airnav RadarBox-modtageren omkring 1000$, nu kan man f\u00e5 RTL-SDR, som g\u00f8r det samme, for 10$.<\/p>\n<p>I mit tilf\u00e6lde var modtageren kun startet for testform\u00e5l, der er ikke praktisk mening i at holde den konstant t\u00e6ndt, da d\u00e6kningsgraden i den europ\u00e6iske del allerede n\u00e5r 100%. For beboere i de russiske dybder kan dette derimod v\u00e6re ganske interessant \u2014 der \u00e5bner sig muligheden for b\u00e5de at g\u00f8re en nyttig tjeneste for flyrejsefanatikere over hele verden ved at udvide d\u00e6kningsomr\u00e5det, og for at f\u00e5 adgang til et Premium-abonnement p\u00e5 de ovenn\u00e6vnte websteder.<\/p>\n<p>Jeg \u00f8nsker alle held og lykke med eksperimenterne.<\/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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