{"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\/pt\/blog\/news\/flightradar24-kak-eto-rabotaet","title":{"rendered":"Flightradar24 \u2014 como funciona?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Provavelmente, todos que j\u00e1 encontraram ou se despediram de familiares ou amigos no avi\u00e3o usaram o servi\u00e7o gratuito Flightradar24. \u00c9 uma maneira bastante conveniente de acompanhar a posi\u00e7\u00e3o do avi\u00e3o em tempo real.<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/46ac95387b5ebe4f996bbc4bc1eb7b3f.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nComo mostrou uma pesquisa com amigos, muito poucos sabem que este servi\u00e7o \u00e9 mantido apenas por entusiastas que enviam dados para o servidor. Ainda menos sabem que qualquer pessoa pode se juntar ao projeto.<\/p>\n<p>Vamos preencher essa lacuna. Sobre como isso funciona, continuaremos abaixo.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>Hardware<\/h2>\n<p>\nA primeira pergunta \u00e9: de onde v\u00eam os dados. <\/p>\n<p>Cada aeronave civil est\u00e1 equipada com um transmissor especial, chamado de <b>transmissor ADS-B<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/ce3a5ddc8b9a1aa17f003ca8739913ba.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>(foto do site da Garmin)<\/i><\/p>\n<p>Esse dispositivo envia na frequ\u00eancia de 1090MHz pacotes especiais, contendo os principais par\u00e2metros de voo, o tipo de aeronave, suas coordenadas, o destino, entre outros. <\/p>\n<p>O sinal no espectro se parece aproximadamente com isso:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/3d084a88bbdf55c8a0f494e9fa832b42.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nE o que \u00e9 mais importante para n\u00f3s, decodificar esses dados n\u00e3o \u00e9 dif\u00edcil, basta ter um receptor RTL-SDR, que custa em torno de 8$, conectado ao computador. Na verdade, a ideia j\u00e1 deve estar clara \u2014 se coletarmos dados de m\u00faltiplos receptores, obteremos uma imagem semelhante a esta:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/351c8855fa9473e424fac9167c4d0b2c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMas isso ainda n\u00e3o \u00e9 tudo. Parte das aeronaves envia pacotes de dados, mas eles n\u00e3o incluem coordenadas de GPS. Se receber dados ao mesmo tempo de m\u00faltiplos receptores, cujas coordenadas s\u00e3o conhecidas, analisando os atrasos em diferentes receptores, \u00e9 poss\u00edvel descobrir a localiza\u00e7\u00e3o da aeronave. Essa tecnologia \u00e9 chamada de multilatera\u00e7\u00e3o (MLAT), e voc\u00ea pode ler mais sobre ela <noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/blog\/how-we-track-flights-with-mlat\/\">no site<\/a><\/noindex>.<\/p>\n<p>E, finalmente, a \u00faltima quest\u00e3o \u2014 como os dados s\u00e3o recebidos. A resposta \u00e9 simples, qualquer um pode instalar um receptor, o custo varia de 0 a 50$. Por exemplo, assim \u00e9 o mapa dos receptores do servi\u00e7o Flightaware:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/d62f720231ff90caa4e652355b4270fa.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nComo podemos ver, a cobertura na parte russa deixa a desejar, ent\u00e3o alguns t\u00eam uma chance real de serem os primeiros.<\/p>\n<p>Para receber os dados, s\u00e3o necess\u00e1rios:<\/p>\n<p> \u2014 Raspberry Pi2\/3 com internet conectada (pre\u00e7o a partir de 20$)<br \/>\n \u2014 Dongle RTL-SDR (pre\u00e7o a partir de 10$)<br \/>\n \u2014 pelo menos uma antena simples feita de 2 peda\u00e7os de fio com 6.8cm cada (1\/4 dipolo a 1090MHz)<\/p>\n<p>Al\u00e9m disso, \u00e9 desej\u00e1vel ter um local com uma linha de vis\u00e3o mais ou menos aberta para pelo menos parte do c\u00e9u, pois os sinais de frequ\u00eancia gigahertz s\u00e3o absorvidos por obst\u00e1culos como pr\u00e9dios ou \u00e1rvores.<\/p>\n<p>Eu j\u00e1 tinha um Raspberry Pi e um RTL-SDR, ent\u00e3o n\u00e3o precisei comprar nada. Mas qualquer um pode tentar obter um receptor pronto gratuitamente \u2014 tanto o Flightradar quanto o Flightaware enviam kits gratuitamente para usu\u00e1rios de \u00e1reas onde a cobertura \u00e9 atualmente inadequada. Voc\u00ea pode enviar um pedido pelo link (<noindex><a rel=\"nofollow\" href=\"https:\/\/www.flightradar24.com\/apply-for-receiver\">Flightradar<\/a><\/noindex> ou <noindex><a rel=\"nofollow\" href=\"http:\/\/uk.flightaware.com\/adsb\/request\">Flightaware<\/a><\/noindex>), \u00e9 claro, \u00e9 sensato tentar para quem vive em \u00e1reas remotas.<\/p>\n<p>Eu usei um kit com RTL-SDR V3, que, junto com a antena e um mini-trip\u00e9, custou 27$ com frete gr\u00e1tis da China:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/21527717b93d546ddc2d6b9a694fabab.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAli\u00e1s, como segundo b\u00f4nus, todos que enviam dados para o servidor, tanto Flightradar24 quanto Flightaware oferecem <b>acesso ilimitado \u00e0 conta premium<\/b> e a todas as funcionalidades do servidor (esse acesso separado custa cerca de 50$\/m\u00eas). Ent\u00e3o, se algu\u00e9m est\u00e1 interessado na avia\u00e7\u00e3o e quer ter acesso expandido a uma conta desse tipo, instalar um receptor RTLSDR \u00e9 uma alternativa bem econ\u00f4mica. <\/p>\n<h2>Testes<\/h2>\n<p>\nA instala\u00e7\u00e3o \u00e9 muito simples, no Raspberry Pi \u00e9 suficiente conectar o receptor e executar um comando:<\/p>\n<pre><code class=\"bash\">sudo bash -c \"[O$(wget -O - http:\/\/repo.feed.flightradar24.com\/install_fr24_rpi.sh)\"<\/code><\/pre>\n<p>\nO script solicitar\u00e1 os dados necess\u00e1rios (coordenadas e tipo de receptor, endere\u00e7o de e-mail), depois o software funcionar\u00e1 automaticamente, sem que o usu\u00e1rio precise de mais aten\u00e7\u00e3o. Paralelamente, voc\u00ea pode ativar a conta premium (para FR24 pelo 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 usar imediatamente todas as suas funcionalidades (rastreamento de voos, etc.).<\/p>\n<p>Voc\u00ea pode acessar a p\u00e1gina do endere\u00e7o IP do Raspberry Pi e ver o status atual:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/acae0206cf4de6c1bb980679efd46631.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nMuito mais informa\u00e7\u00f5es podem ser vistas na p\u00e1gina da conta Flightradar24:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/b683667ba760466f2915312cb0804556.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEu moro no 6\u00ba andar, relativamente perto do aeroporto, ent\u00e3o o n\u00famero de avi\u00f5es observados em um dia foi de mais de 1000, mesmo com uma antena simples na janela. Curiosamente, mesmo com essa antena, a dist\u00e2ncia m\u00e1xima at\u00e9 o avi\u00e3o recebido foi de 215 milhas. Diferentes op\u00e7\u00f5es de antenas podem ser encontradas no eBay, buscando por antena ads-b.<\/p>\n<h2>Alternativa<\/h2>\n<p>\nB\u00f4nus para aqueles que tiveram paci\u00eancia de ler at\u00e9 aqui. Alguns leitores podem se perguntar: \u00e9 poss\u00edvel operar sem servi\u00e7os de terceiros como o Flightradar? Claro que sim, \u00e9 poss\u00edvel rodar o decodificador no Raspberry Pi diretamente. O c\u00f3digo-fonte pode ser baixado em <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/antirez\/dump1090\">github.com\/antirez\/dump1090<\/a><\/noindex>.<\/p>\n<p>\u00c9 suficiente digitar 3 comandos no Raspberry Pi:<\/p>\n<pre><code class=\"bash\">git clone https:\/\/github.com\/antirez\/dump1090.git\ncd dump1090\/\nmake<\/code><\/pre>\n<p>\nEm seguida, o decodificador pode ser iniciado com o comando:<\/p>\n<pre><code class=\"bash\">.\\\/dump1090 --interactive --net<\/code><\/pre>\n<p>\nO decodificador come\u00e7a a funcionar, e vemos os 'dados brutos' \u2014 uma lista de 've\u00edculos' vis\u00edveis:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/20b9d9c175260e635cc4a609707bb058.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAgora podemos acessar o Raspberry Pi pelo navegador e admirar o nosso pr\u00f3prio Flightradar local, a imagem pode parecer algo assim:<\/p>\n<p><img decoding=\"async\" alt=\"Flightradar24 \u2014 como funciona?\" src=\"\/wp-content\/uploads\/2019\/03\/c7369e9cdc13b2ff36996cb51e959f9c.jpeg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPor que isso pode ser necess\u00e1rio? Primeiro, por curiosidade, e em segundo lugar, o Flightradar24, infelizmente, filtra parte dos dados e mostra <i>nem todos<\/i> os avi\u00f5es (por exemplo, podem n\u00e3o ser exibidos avi\u00f5es militares, governamentais ou jatos executivos). Ao iniciar nosso pr\u00f3prio servi\u00e7o local, vemos tudo 'como \u00e9', sem nenhum tipo de censura. No entanto, o volume de dados \u00e9 limitado pela nossa localiza\u00e7\u00e3o local e pela qualidade da antena, al\u00e9m de que a tecnologia MLAT n\u00e3o estar\u00e1 dispon\u00edvel. O Dump1090 est\u00e1 dispon\u00edvel em c\u00f3digo-fonte, ent\u00e3o quem desejar pode at\u00e9 criar sua pr\u00f3pria vers\u00e3o do Flightradar, com blackjack e outras funcionalidades.<\/p>\n<h2>Como resultado, obtemos um servi\u00e7o de \"monitoramento como servi\u00e7o\", automatizado na linha de produ\u00e7\u00e3o de integra\u00e7\u00e3o cont\u00ednua. O desenvolvedor ou testador precisa apenas definir a lista de m\u00e9tricas em um arquivo JSON, e tudo o mais acontece automaticamente. Obtemos um controle de qualidade transparente dos lan\u00e7amentos: todas as notifica\u00e7\u00f5es sobre desempenho, consumo de recursos ou regress\u00f5es arquitet\u00f4nicas.<\/h2>\n<p>\nComo pode ser visto, tudo n\u00e3o \u00e9 t\u00e3o complicado, e \u00e9 bastante interessante e barato. Para entender a faixa de pre\u00e7os: h\u00e1 10 anos, o receptor Airnav RadarBox custava cerca de 1000$, agora o RTL-SDR, que faz a mesma coisa, pode ser adquirido por 10$.<\/p>\n<p>No meu caso, o receptor foi ligado apenas para testes; n\u00e3o faz sentido mant\u00ea-lo sempre ligado, pois a densidade de cobertura na parte europeia j\u00e1 atinge 100%. Para os residentes das \u00e1reas remotas da R\u00fassia, isso pode ser bastante interessante \u2014 surge a possibilidade de fazer algo \u00fatil para os viajantes a\u00e9reos do mundo todo, ampliando a zona de cobertura, e tamb\u00e9m obter acesso a uma conta Premium nos sites mencionados.<\/p>\n<p>Desejo a todos bons experimentos.<\/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. 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