{"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\/it\/blog\/novosti-interneta\/flightradar24-kak-eto-rabotaet","title":{"rendered":"Flightradar24 \u2014 come funziona?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Probabilmente chiunque abbia mai incontrato o accompagnato parenti o amici in aereo ha utilizzato il servizio gratuito Flightradar24. Questo \u00e8 un modo molto comodo per monitorare la posizione dell'aeroplano in tempo reale.<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/46ac95387b5ebe4f996bbc4bc1eb7b3f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nCome ha mostrato un sondaggio tra amici, pochissimi sanno che questo servizio \u00e8 supportato solo da appassionati che inviano dati al server. Ancora meno sanno che chiunque pu\u00f2 unirsi al progetto.<\/p>\n<p>Colmiamo questa lacuna. Di seguito approfondiremo come funziona.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Hardware<\/h2>\n<p>\nLa prima domanda \u00e8: da dove provengono i dati? <\/p>\n<p>Ogni aereo civile \u00e8 dotato di un trasmettitore speciale, conosciuto come <b>trasmettitore ADS-B<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/ce3a5ddc8b9a1aa17f003ca8739913ba.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>(foto dal sito Garmin)<\/i><\/p>\n<p>Questo dispositivo invia su una frequenza di 1090 MHz pacchetti speciali contenenti i principali parametri di volo, il tipo di velivolo, le sue coordinate, il punto di destinazione, e altro. <\/p>\n<p>Il segnale nello spettro appare pi\u00f9 o meno cos\u00ec:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/3d084a88bbdf55c8a0f494e9fa832b42.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nE ci\u00f2 che per noi \u00e8 pi\u00f9 importante, decodificare questi dati non \u00e8 difficile, basta un ricevitore RTL-SDR del costo di circa 8$, collegato a un computer. In effetti, l'idea \u00e8 gi\u00e0 chiara: se raccogliamo dati da molti ricevitori, otteniamo un'immagine pi\u00f9 o meno simile a questa:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/351c8855fa9473e424fac9167c4d0b2c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMa non \u00e8 tutto. Alcuni aerei trasmettono pacchetti di dati, ma non contengono coordinate GPS. Se si ricevono dati contemporaneamente da molti ricevitori, le cui coordinate sono note, analizzando i ritardi nei vari ricevitori, \u00e8 possibile scoprire la posizione dell'aeromobile. Questa tecnologia si chiama multilateration (MLAT), e puoi leggere di pi\u00f9 <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/blog\/how-we-track-flights-with-mlat\/\">sul sito<\/a><\/noindex>.<\/p>\n<p>E, infine, l'ultima domanda: come vengono ricevuti i dati. La risposta \u00e8 semplice, chiunque pu\u00f2 posizionare un ricevitore, il costo varia da 0 a 50$. Per esempio, ecco a cosa assomiglia la mappa dei ricevitori del servizio Flightaware:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/d62f720231ff90caa4e652355b4270fa.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nCome si pu\u00f2 vedere, la copertura della parte russa lascia a desiderare, quindi alcuni hanno buone possibilit\u00e0 di essere i primi.<\/p>\n<p>Per ricevere i dati sono necessari:<\/p>\n<p> \u2014 Raspberry Pi2\/3 con connessione a Internet (prezzo da 20$)<br \/>\n \u2014 RTL-SDR dongle (prezzo da 10$)<br \/>\n \u2014 almeno un'antenna semplice composta da due pezzi di filo di 6,8 cm ciascuno (dipolo 1\/4 su 1090 MHz)<\/p>\n<p>\u00c8 inoltre consigliabile trovare un luogo con una vista pi\u00f9 o meno aperta di una parte del cielo, poich\u00e9 i segnali a frequenza gigahertz vengono assorbiti da ostacoli come edifici o alberi.<\/p>\n<p>Avevo gi\u00e0 sia un Raspberry Pi che un RTL-SDR, quindi non ho dovuto acquistare nulla. Ma chiunque pu\u00f2 provare a ottenere un ricevitore completo gratuitamente \u2014 sia Flightradar che Flightaware inviano kit gratuiti agli utenti delle aree dove la copertura \u00e8 attualmente insufficiente. \u00c8 possibile inviare una richiesta tramite il link (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/apply-for-receiver\">Flightradar<\/a><\/noindex> o <noindex><a rel=\"nofollow\" href=\"http:\/\/uk.flightaware.com\/adsb\/request\">Flightaware<\/a><\/noindex>), ovviamente \u00e8 sensato provare per chi vive in zone piuttosto remote.<\/p>\n<p>Ho utilizzato un kit RTL-SDR V3, che insieme all'antenna e a un mini treppiede costava 27$ con spedizione gratuita dalla Cina:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/21527717b93d546ddc2d6b9a694fabab.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA proposito, come secondo bonus, a tutti coloro che inviano dati al server, sia Flightradar24 che Flightaware offrono <b>accesso illimitato a un account premium<\/b> e a tutte le funzionalit\u00e0 del server (l'accesso separato costa circa 50$\/mese). Quindi, se qualcuno \u00e8 interessato all'aviazione e desidera avere accesso ampliato a un tale account, l'installazione di un ricevitore RTLSDR \u00e8 un'alternativa decisamente economica. <\/p>\n<h2>Test<\/h2>\n<p>\nL'installazione \u00e8 estremamente semplice, su Raspberry Pi \u00e8 sufficiente collegare il ricevitore e avviare un comando:<\/p>\n<pre><code class=\"bash\">sudo bash -c \"$(wget -O - http:\/\/repo.feed.flightradar24.com\/install_fr24_rpi.sh)\"<\/code><\/pre>\n<p>\nLo script richieder\u00e0 i dati necessari (coordinate e tipo di ricevitore, indirizzo email), dopodich\u00e9 il software funzioner\u00e0 automaticamente, senza necessit\u00e0 di ulteriori interventi da parte dell'utente. Parallelamente, \u00e8 possibile attivare un account premium (per FR24 al link <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/premium\/signup?account=free\">https:\/\/www.flightradar24.com\/premium\/signup?account=free<\/a><\/noindex>) e iniziare ad utilizzare tutte le sue funzionalit\u00e0 (tracciamento voli, ecc.).<\/p>\n<p>Puoi visitare la pagina dell'indirizzo IP del Raspberry Pi e vedere lo stato attuale:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/acae0206cf4de6c1bb980679efd46631.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nMolte pi\u00f9 informazioni possono essere visualizzate nella pagina dell'account Flightradar24:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/b683667ba760466f2915312cb0804556.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAbito al sesto piano, relativamente vicino all'aeroporto, quindi il numero di aerei osservati in un giorno ha superato le 1000 unit\u00e0, anche con una semplice antenna sul davanzale. \u00c8 interessante notare che, nonostante questa antenna, la massima distanza fino all'aereo ricevuto \u00e8 stata di 215 miglia. Diverse opzioni di antenne possono essere trovate su ebay cercando \"ads-b antenna\".<\/p>\n<h2>Alternativa<\/h2>\n<p>\nUn bonus per coloro che hanno avuto la pazienza di arrivare fin qui. Alcuni lettori potrebbero chiedersi: \u00e8 possibile fare a meno di servizi esterni come Flightradar? Certamente, si pu\u00f2 lanciare un decodificatore su Raspberry Pi direttamente. I sorgenti possono essere scaricati all'indirizzo <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/antirez\/dump1090\">github.com\/antirez\/dump1090<\/a><\/noindex>.<\/p>\n<p>\u00c8 sufficiente digitare 3 comandi sul Raspberry Pi:<\/p>\n<pre><code class=\"bash\">git clone https:\/\/github.com\/antirez\/dump1090.git\ncd dump1090\/\nmake<\/code><\/pre>\n<p>\nPoi, il decodificatore pu\u00f2 essere avviato con il comando:<\/p>\n<pre><code class=\"bash\">.\/dump1090 --interactive --net<\/code><\/pre>\n<p>\nIl decodificatore inizia a funzionare, e vediamo i \"dati grezzi\" \u2014 un elenco degli \"aerei\" visibili:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/20b9d9c175260e635cc4a609707bb058.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nOra si pu\u00f2 accedere al Raspberry Pi con un browser e ammirare il proprio Flightradar locale, l'immagine potrebbe apparire pi\u00f9 o meno cos\u00ec:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 come funziona?\" src=\"\/wp-content\/uploads\/2019\/03\/c7369e9cdc13b2ff36996cb51e959f9c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA cosa pu\u00f2 servire? Prima di tutto, per pura curiosit\u00e0, in secondo luogo, Flightradar24, sfortunatamente, filtra alcune informazioni e mostra <i>non tutto<\/i> aerei (ad esempio, potrebbero non essere mostrati aerei militari, governativi o jet privati). Avviando un servizio locale, vediamo tutto \u00abcos\u00ec com'\u00e8\u00bb, senza alcuna censura. Tuttavia, il volume dei dati \u00e8 limitato dalla nostra posizione locale e dalla qualit\u00e0 dell'antenna, e non sar\u00e0 disponibile la tecnologia MLAT. Dump1090 \u00e8 disponibile in sorgenti, quindi chi desidera pu\u00f2 anche creare la propria versione di Flightradar, con blackjack e altre funzionalit\u00e0.<\/p>\n<h2>Conclusioni<\/h2>\n<p>\nCome si pu\u00f2 vedere, non \u00e8 cos\u00ec complicato, ed \u00e8 anche interessante e poco costoso. Per capire l'ordine dei prezzi: dieci anni fa, il ricevitore Airnav RadarBox costava circa 1000$, ora RTL-SDR, che fa la stessa cosa, si pu\u00f2 prendere per 10$.<\/p>\n<p>Nel mio caso, il ricevitore \u00e8 stato avviato solo per i test, non ha senso tenerlo sempre acceso, la densit\u00e0 di copertura nella parte europea ha gi\u00e0 raggiunto il 100%. Per i residenti nelle zone remote della Russia, invece, potrebbe essere molto interessante: c'\u00e8 l'opportunit\u00e0 di fare qualcosa di utile per i viaggiatori aerei di tutto il mondo, ampliando la zona di copertura, e di accedere a un account Premium sui suddetti siti.<\/p>\n<p>Buoni esperimenti a tutti.<\/p>\n<p>Fonte: <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. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-42137","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/flightradar24-kak-eto-rabotaet\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"it_IT\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47Flightradar24 \u2014 \u043a\u0430\u043a \u044d\u0442\u043e \u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442? 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