{"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\/sl\/blog\/news\/flightradar24-kak-eto-rabotaet","title":{"rendered":"Flightradar24 \u2014 kako to funkcioni\u0161e?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Verjetno je vsak, ki je kdaj poslu\u0161an ali pospremil sorodnike ali prijatelje na letalo, uporabil brezpla\u010dno storitev Flightradar24. To je zelo priro\u010den na\u010din za sledenje polo\u017eaju letala v realnem \u010dasu.<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/46ac95387b5ebe4f996bbc4bc1eb7b3f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKot je pokazala anketa med znanci, zelo malo kdo ve, da to storitev podpirajo le entuziasti, ki po\u0161iljajo podatke na stre\u017enik. Tudi \u0161e manj jih ve, da se lahko k projektu pridru\u017ei vsakdo.<\/p>\n<p>Zapolnili bomo to vrzel. O tem, kako deluje, bomo nadaljevali pod spodaj.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Strojna oprema<\/h2>\n<p>\nPrvo vpra\u0161anje je \u2014 od kod prihajajo podatki. <\/p>\n<p>Vsako civilno letalo je opremljeno s posebnim oddajnikom, tako imenovanim <b>ADS-B transponder<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/ce3a5ddc8b9a1aa17f003ca8739913ba.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>(slika s spletne strani Garmin)<\/i><\/p>\n<p>Ta naprava na frekvenci 1090MHz po\u0161ilja posebne pakete, ki vsebujejo osnovne parametre leta, tip zra\u010dnega plovila, njegove koordinate, destinacijo itd. <\/p>\n<p>Signal na spektru izgleda nekako tako:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/3d084a88bbdf55c8a0f494e9fa832b42.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nIn kar je za nas najpomembnej\u0161e, dekodirati te podatke ni te\u017eko, dovolj je RTL-SDR sprejemnik, ki stane okoli 8$, povezan z ra\u010dunalnikom. Dejansko je ideja verjetno \u017ee jasna \u2014 \u010de zberemo podatke z ve\u010d sprejemnikov, dobimo sliko, pribli\u017eno tako:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/351c8855fa9473e424fac9167c4d0b2c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVendar to \u0161e ni vse. Del letal po\u0161ilja pakete podatkov, vendar v njih ni GPS koordinat. \u010ce sprejemamo podatke hkrati z ve\u010d sprejemnikov, katerih koordinate so znane, lahko z analizo zamud na razli\u010dnih sprejemnikih ugotovimo lokacijo zra\u010dnega plovila. Tak\u0161na tehnologija se imenuje multilateracija (MLAT), o njej lahko preberete ve\u010d <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/blog\/how-we-track-flights-with-mlat\/\">na spletnem mestu<\/a><\/noindex>.<\/p>\n<p>In kon\u010dno, zadnje vpra\u0161anje \u2014 kako se podatki sprejemajo. Odgovor je preprost, sprejemnik si lahko postavi kdorkoli, cena vpra\u0161anja zna\u0161a od 0 do 50$. Za primer, tako izgleda karta sprejemnikov storitve Flightaware:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/d62f720231ff90caa4e652355b4270fa.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKot je videti, pokritost ruske strani pu\u0161\u010da veliko \u017eelja, tako da imajo nekateri povsem mo\u017enosti, da postanejo prvi.<\/p>\n<p>Za sprejem podatkov potrebujete:<\/p>\n<p> \u2014 Raspberry Pi2\/3 s povezanim internetom (cena od 20$)<br \/>\n \u2014 RTL-SDR dongle (cena od 10$)<br \/>\n \u2014 vsaj najpreprostej\u0161a antena iz dveh kosov \u017eice dol\u017eine 6.8 cm (1\/4 dipol na 1090MHz)<\/p>\n<p>Prav tako je za\u017eeleno mesto z bolj ali manj odprtim obzorjem vsaj del neba, saj se signali gigaher\u010dne frekvence absorbirajo v ovirah, kot so hi\u0161e ali drevesa.<\/p>\n<p>Imam Raspberry Pi i RTL-SDR, tako da mi nije bilo potrebno ni\u0161ta kupovati. No, svatko mo\u017ee besplatno poku\u0161ati dobiti spreman prijemnik \u2014 Flightradar i Flightaware \u0161alju komplekte besplatno korisnicima iz podru\u010dja gdje pokri\u0107e trenutno nije dovoljno. Zahtjev mo\u017eete poslati putem linka (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/apply-for-receiver\">Flightradar<\/a><\/noindex> ili <noindex><a rel=\"nofollow\" href=\"http:\/\/uk.flightaware.com\/adsb\/request\">Flightaware<\/a><\/noindex>), naravno, preporu\u010duje se poku\u0161ati onima koji \u017eive u dovoljno udaljenim podru\u010djima.<\/p>\n<p>Koristio sam RTL-SDR V3 komplet, koji je zajedno s antenom i mini stativom ko\u0161tao 27$ s besplatnom dostavom iz Kine:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/21527717b93d546ddc2d6b9a694fabab.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nUsput, kao drugi bonus, svima koji \u0161alju podatke na server, i Flightradar24 i Flightaware omogu\u0107uju <b>neograni\u010den pristup premium ra\u010dunu<\/b> i svim funkcijama servera (takav pristup posebno ko\u0161ta oko 50$\/mjesec). Dakle, ako nekoga zanima avijacija i \u017eeli imati pro\u0161ireni pristup takvom ra\u010dunu, instalacija RTLSDR prijemnika je prili\u010dno jeftina alternativa. <\/p>\n<h2>Testiranje<\/h2>\n<p>\nInstalacija je vrlo jednostavna, na Raspberry Pi dovoljno je priklju\u010diti prijemnik i pokrenuti jednu naredbu:<\/p>\n<pre><code class=\"bash\">sudo bash -c \"$(wget -O - http:\/\/repo.feed.flightradar24.com\/install_fr24_rpi.sh)\"<\/code><\/pre>\n<p>\nSkripta \u0107e tra\u017eiti potrebne podatke (koordinate i tip prijemnika, email adresu), nakon toga softver \u0107e raditi automatski, vi\u0161e pa\u017enje od korisnika nije potrebno. Paralelno, mo\u017eete aktivirati premium ra\u010dun (za FR24 putem linka <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/premium\/signup?account=free\">https:\/\/www.flightradar24.com\/premium\/signup?account=free<\/a><\/noindex>) i odmah koristiti sve njegove mogu\u0107nosti (pra\u0107enje letova itd.).<\/p>\n<p>Mo\u017eete pristupiti stranici IP adrese Raspberry Pi i vidjeti trenutni status:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/acae0206cf4de6c1bb980679efd46631.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nMnogo vi\u0161e informacija mo\u017eete vidjeti na stranici ra\u010duna Flightradar24:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/b683667ba760466f2915312cb0804556.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u017divim na 6. katu relativno blizu aerodroma, pa je broj uo\u010denih aviona tijekom dana bio ve\u0107i od 1000, \u010dak i s jednostavnom antenom na prozoru. Zanimljivo je da je \u010dak i s tom antenom maksimalna udaljenost do primljenog aviona bila 215 milja. Razli\u010dite vrste antena mo\u017eete prona\u0107i na eBayu, jednostavno tra\u017ee\u0107i ads-b antenna.<\/p>\n<h2>Alternativa<\/h2>\n<p>\nBonus za one koji su imali strpljenja pro\u010ditati do ovdje. Neki \u010ditatelji mogu postaviti pitanje: mo\u017ee li se pro\u0107i bez vanjskih usluga poput Flightradara? Naravno, mo\u017ee se, pokrenuti dekoder na Raspberry Pi mo\u017ee se i direktno. Izvorni kodovi mogu se preuzeti na adresi <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/antirez\/dump1090\">github.com\/antirez\/dump1090<\/a><\/noindex>.<\/p>\n<p>Samo je potrebno na Raspberry Pi ukucati 3 naredbe:<\/p>\n<pre><code class=\"bash\">git clone https:\/\/github.com\/antirez\/dump1090.git\ncd dump1090\/\nmake<\/code><\/pre>\n<p>\nNato se dekoder lahko za\u017eene z ukazom:<\/p>\n<pre><code class=\"bash\">.\/dump1090 --interactive --net<\/code><\/pre>\n<p>\nDekoder za\u010dne delovati in vidimo \"surove podatke\" \u2014 seznam vidnih \"letal\":<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/20b9d9c175260e635cc4a609707bb058.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nZdaj lahko preko brskalnika dostopamo do Raspberry Pi in ob\u010dudujemo svoj lokalni Flightradar, slika bi lahko izgledala pribli\u017eno tako:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 kako to funkcioni\u0161e?\" src=\"\/wp-content\/uploads\/2019\/03\/c7369e9cdc13b2ff36996cb51e959f9c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nZakaj bi to lahko bilo potrebno? Prvi\u010d, iz \u010distega zanimanja, drugi\u010d, Flightradar24 \u017eal filtrira del podatkov in prikazuje <i>ne vsa<\/i> letala (na primer, morda ne prikazuje voja\u0161kih, vladnih ali poslovnih letal). Z zagonjem lastne lokalne storitve vidimo vse \"kot je\", brez cenzure. Seveda je obseg podatkov omejen z na\u0161o lokalno lokacijo in kakovostjo antene, poleg tega ne bo na voljo tehnologija MLAT. Dump1090 je na voljo v izvorni kodi, tako da si lahko tisti, ki \u017eelijo, ustvarijo svojo razli\u010dico Flightradra, z blackjackom in drugimi dodatki.<\/p>\n<h2>Zaklju\u010dki<\/h2>\n<p>\nKot lahko vidite, vse ni tako zapleteno, hkrati pa je povsem zanimivo in cenovno dostopno. Za razumevanje cenovnega reda: pred 10 leti je sprejemnik Airnav RadarBox stal okoli 1000$, zdaj pa lahko RTL-SDR, ki dela enako, dobite za 10$.<\/p>\n<p>V mojem primeru je bil sprejemnik zagonjen le za testiranje, prakti\u010dno ni smiselno, da bi ga imel nenehno vklopljenega, gostota pokritosti evropskega dela \u017ee dosega 100%. Za prebivalce ruske provincije pa je to lahko vsekakor zanimivo \u2014 tako se pojavi prilo\u017enost za opravljanje koristnega dela za potnike po svetu, ko se raz\u0161iri obmo\u010dje pokritosti, kot tudi dostop do Premium ra\u010duna omenjenih spletnih strani.<\/p>\n<p>Vsem \u017eelim uspe\u0161ne eksperimente.<\/p>\n<p>Izvor: <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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