{"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\/cs\/blog\/news\/flightradar24-kak-eto-rabotaet","title":{"rendered":"Flightradar24 \u2014 jak to funguje?","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Snad ka\u017ed\u00fd, kdo alespo\u0148 jednou doprov\u00e1zel nebo vyprov\u00e1zel p\u0159\u00edbuzn\u00e9 \u010di p\u0159\u00e1tele na leti\u0161t\u011b, pou\u017eil bezplatnou slu\u017ebu Flightradar24. Je to velmi pohodln\u00fd zp\u016fsob, jak sledovat polohu letadla v re\u00e1ln\u00e9m \u010dase.<\/p>\n

\"Flightradar24
\n
\nJak uk\u00e1zal pr\u016fzkum mezi zn\u00e1m\u00fdmi, velmi m\u00e1lo kdo v\u00ed, \u017ee tuto slu\u017ebu podporuj\u00ed pouze nad\u0161enci, kte\u0159\u00ed pos\u00edlaj\u00ed data na server. Je\u0161t\u011b m\u00e9n\u011b lid\u00ed v\u00ed, \u017ee se m\u016f\u017ee p\u0159ipojit k projektu kdokoliv.<\/p>\n

Vypln\u00edme tuto mezeru. O tom, jak to funguje, budeme pokra\u010dovat n\u00ed\u017ee.
\n<\/a><\/noindex><\/p>\n

Hardware<\/h2>\n

\nNejd\u016fle\u017eit\u011bj\u0161\u00ed ot\u00e1zka \u2014 odkud poch\u00e1zej\u00ed data. <\/p>\n

Ka\u017ed\u00e9 civiln\u00ed letadlo je vybaveno speci\u00e1ln\u00edm vys\u00edla\u010dem, takzvan\u00fdm ADS-B transponderem<\/b>:<\/p>\n

\"Flightradar24
\n(foto z webu Garmin)<\/i><\/p>\n

Toto za\u0159\u00edzen\u00ed vys\u00edl\u00e1 na frekvenci 1090 MHz speci\u00e1ln\u00ed zpr\u00e1vy, kter\u00e9 obsahuj\u00ed z\u00e1kladn\u00ed \u00fadaje o letu, typ letadla, jeho sou\u0159adnice, c\u00edlov\u00e9 m\u00edsto a dal\u0161\u00ed. <\/p>\n

Sign\u00e1l na spektru vypad\u00e1 p\u0159ibli\u017en\u011b takto:<\/p>\n

\"Flightradar24
\n
\nA co je pro n\u00e1s nejd\u016fle\u017eit\u011bj\u0161\u00ed, dek\u00f3dov\u00e1n\u00ed t\u011bchto dat nen\u00ed slo\u017eit\u00e9, sta\u010d\u00ed RTL-SDR p\u0159ij\u00edma\u010d za p\u0159ibli\u017en\u011b 8 $, p\u0159ipojen\u00fd k po\u010d\u00edta\u010di. Vlastn\u011b je u\u017e asi jasn\u00e9, \u017ee pokud shrom\u00e1\u017ed\u00edme data z mnoha p\u0159ij\u00edma\u010d\u016f, z\u00edsk\u00e1me obr\u00e1zek, p\u0159ibli\u017en\u011b takov\u00fdto:<\/p>\n

\"Flightradar24
\n
\nAle to je\u0161t\u011b nen\u00ed v\u0161echno. N\u011bkter\u00e1 letadla p\u0159en\u00e1\u0161ej\u00ed datov\u00e9 pakety, ale chyb\u00ed v nich GPS sou\u0159adnice. Pokud p\u0159ij\u00edm\u00e1me data sou\u010dasn\u011b z mnoha p\u0159ij\u00edma\u010d\u016f, jejich\u017e sou\u0159adnice zn\u00e1me, pak anal\u00fdzou zpo\u017ed\u011bn\u00ed na r\u016fzn\u00fdch p\u0159ij\u00edma\u010d\u00edch m\u016f\u017eeme zjistit polohu vzdu\u0161n\u00e9ho plavidla. Tato technologie se naz\u00fdv\u00e1 multilaterace (MLAT), o kter\u00e9 si m\u016f\u017eete p\u0159e\u010d\u00edst v\u00edce. na webu<\/a><\/noindex>.<\/p>\n

A kone\u010dn\u011b posledn\u00ed ot\u00e1zka \u2014 jak se data p\u0159ij\u00edmaj\u00ed. Odpov\u011b\u010f je jednoduch\u00e1, p\u0159ij\u00edma\u010d si m\u016f\u017ee um\u00edstit kdokoliv, cena se pohybuje od 0 do 50 $. Pro p\u0159\u00edklad, takto vypad\u00e1 mapa p\u0159ij\u00edma\u010d\u016f slu\u017eby Flightaware:<\/p>\n

\"Flightradar24
\n
\nJak je vid\u011bt, pokryt\u00ed rusk\u00e9 \u010d\u00e1sti nen\u00ed p\u0159\u00edli\u0161 dobr\u00e9, tak\u017ee n\u011bkte\u0159\u00ed mohou m\u00edt \u0161anci b\u00fdt prvn\u00ed.<\/p>\n

Pro p\u0159ij\u00edm\u00e1n\u00ed dat jsou pot\u0159ebn\u00e9:<\/p>\n

\u2014 Raspberry Pi2\/3 s p\u0159ipojen\u00fdm internetem (cena od 20 $)
\n \u2014 RTL-SDR dongle (cena od 10 $)
\n \u2014 alespo\u0148 z\u00e1kladn\u00ed ant\u00e9na z 2 kus\u016f dr\u00e1tu o d\u00e9lce 6,8 cm ka\u017ed\u00fd (1\/4 dip\u00f3l na 1090 MHz)<\/p>\n

Tak\u00e9 je \u017e\u00e1douc\u00ed m\u00edt m\u00edsto s v\u00edce m\u00e9n\u011b otev\u0159en\u00fdm v\u00fdhledem na \u010d\u00e1st oblohy, proto\u017ee sign\u00e1ly gigahertzov\u00fdch frekvenc\u00ed jsou absorbov\u00e1ny p\u0159ek\u00e1\u017ekami jako jsou domy nebo stromy.<\/p>\n

M\u00e1m Raspberry Pi a RTL-SDR, tak\u017ee jsem nic nemusel kupovat. Ale kdokoli si m\u016f\u017ee zdarma vyzkou\u0161et hotov\u00fd p\u0159ij\u00edma\u010d \u2014 jak Flightradar, tak Flightaware nab\u00edzej\u00ed sady zdarma u\u017eivatel\u016fm z oblast\u00ed, kde moment\u00e1ln\u011b nen\u00ed dostate\u010dn\u00e9 pokryt\u00ed. \u017d\u00e1dost m\u016f\u017eete poslat pomoc\u00ed odkazu (Flightradar<\/a><\/noindex> nebo Flightaware<\/a><\/noindex>), samoz\u0159ejm\u011b to zkou\u0161et m\u00e1 smysl, pokud \u017eijete v dostate\u010dn\u011b odlehl\u00e9 oblasti.<\/p>\n

Pou\u017e\u00edval jsem sadu od RTL-SDR V3, kter\u00e1 spolu s ant\u00e9nou a mini-stativem st\u00e1la 27 $ s bezplatnou dopravou z \u010c\u00edny:<\/p>\n

\"Flightradar24
\n
\nMimochodem, jako druh\u00fd bonus, v\u0161em, kte\u0159\u00ed pos\u00edlaj\u00ed data na server, Flightradar24 a Flightaware poskytuj\u00ed neomezen\u00fd p\u0159\u00edstup k pr\u00e9miov\u00e9mu \u00fa\u010dtu<\/b> a ke v\u0161em funkc\u00edm serveru (takov\u00fd p\u0159\u00edstup obvykle stoj\u00ed kolem 50 $\/m\u011bs\u00edc). Tak\u017ee pokud n\u011bkdo m\u00e1 z\u00e1jem o letectv\u00ed a chce m\u00edt roz\u0161\u00ed\u0159en\u00fd p\u0159\u00edstup k takov\u00e9mu \u00fa\u010dtu, instalace RTLSDR p\u0159ij\u00edma\u010de je celkem levn\u00e1 alternativa. <\/p>\n

Testov\u00e1n\u00ed<\/h2>\n

\nInstalace je velmi jednoduch\u00e1, na Raspberry Pi sta\u010d\u00ed p\u0159ipojit p\u0159ij\u00edma\u010d a spustit jeden p\u0159\u00edkaz:<\/p>\n

sudo bash -c \"$(wget -O - http:\/\/repo.feed.flightradar24.com\/install_fr24_rpi.sh)\"<\/code><\/pre>\n
\nSkript po\u017e\u00e1d\u00e1 o pot\u0159ebn\u00e9 \u00fadaje (sou\u0159adnice a typ p\u0159ij\u00edma\u010de, e-mailovou adresu), pot\u00e9 bude software fungovat automaticky, pozornost u\u017eivatele nen\u00ed v\u00edce vy\u017eadov\u00e1na. Sou\u010dasn\u011b m\u016f\u017eete aktivovat pr\u00e9miov\u00fd \u00fa\u010det (pro FR24 pomoc\u00ed odkazu https:\/\/www.flightradar24.com\/premium\/signup?account=free<\/a><\/noindex>) a hned vyu\u017e\u00edvat v\u0161echny jeho mo\u017enosti (sledov\u00e1n\u00ed let\u016f atd.).<\/p>\n
M\u016f\u017eete p\u0159ej\u00edt na str\u00e1nku s IP adresou Raspberry Pi a vid\u011bt aktu\u00e1ln\u00ed stav:<\/p>\n
\"Flightradar24
\nDal\u0161\u00ed informace m\u016f\u017eete vid\u011bt na str\u00e1nce \u00fa\u010dtu Flightradar24:<\/p>\n
\"Flightradar24
\n
\nBydl\u00edm ve 6. pat\u0159e relativn\u011b nedaleko leti\u0161t\u011b, tak\u017ee po\u010det pozorovan\u00fdch letadel za den p\u0159es\u00e1hl 1000, dokonce i s jednoduchou ant\u00e9nou na okenn\u00edm parapetu. Zaj\u00edmav\u00e9 je, \u017ee i s takovou ant\u00e9nou byla maxim\u00e1ln\u00ed vzd\u00e1lenost p\u0159ijat\u00e9ho letadla 215 mil. R\u016fzn\u00e9 varianty ant\u00e9n m\u016f\u017eete naj\u00edt na ebay, kdy\u017e do vyhled\u00e1v\u00e1n\u00ed zad\u00e1te ads-b antenna.<\/p>\n
Alternativa<\/h2>\n
\nBonus pro ty, kte\u0159\u00ed m\u011bli dost trp\u011blivosti, aby do\u010detli a\u017e sem. N\u011bkte\u0159\u00ed \u010dten\u00e1\u0159i se mohou pt\u00e1t: lze se obej\u00edt bez extern\u00edch slu\u017eeb jako Flightradar? Samoz\u0159ejm\u011b, m\u016f\u017eete spustit dekod\u00e9r na Raspberry Pi i p\u0159\u00edmo. Zdrojov\u00e9 k\u00f3dy si m\u016f\u017eete st\u00e1hnout na adrese github.com\/antirez\/dump1090<\/a><\/noindex>.<\/p>\n
Sta\u010d\u00ed na Raspberry Pi zadat 3 p\u0159\u00edkazy:<\/p>\n
git clone https:\/\/github.com\/antirez\/dump1090.git\ncd dump1090\/\nmake<\/code><\/pre>\n
\nPot\u00e9 lze dekod\u00e9r spustit p\u0159\u00edkazem:<\/p>\n
.\\\/dump1090 --interactive --net<\/code><\/pre>\n
\nDekod\u00e9r za\u010dne pracovat a my uvid\u00edme \"surov\u00e1 data\" \u2014 seznam viditeln\u00fdch \"letadel\":<\/p>\n
\"Flightradar24
\n
\nNyn\u00ed se m\u016f\u017eeme p\u0159ipojit p\u0159es prohl\u00ed\u017ee\u010d na Raspberry Pi a obdivovat vlastn\u00ed, lok\u00e1ln\u00ed Flightradar, obr\u00e1zek m\u016f\u017ee vypadat p\u0159ibli\u017en\u011b takto:<\/p>\n
\"Flightradar24
\n
\nPro\u010d by to mohlo b\u00fdt u\u017eite\u010dn\u00e9? Zaprv\u00e9, prost\u011b ze zv\u011bdavosti, a zadruh\u00e9, Flightradar24 bohu\u017eel filtruje \u010d\u00e1st dat a zobrazuje ne v\u0161echna<\/i> letadla (nap\u0159\u00edklad vojensk\u00e1, vl\u00e1dn\u00ed nebo business jet). Spu\u0161t\u011bn\u00edm vlastn\u00edho lok\u00e1ln\u00edho servisu vid\u00edme v\u0161e \"tak, jak to je\", bez jak\u00e9koli cenzury. Nicm\u00e9n\u011b, objem dat je samoz\u0159ejm\u011b omezen na\u0161i lok\u00e1ln\u00ed polohou a kvalitou ant\u00e9ny, a technologie MLAT nebude tak\u00e9 dostupn\u00e1. Dump1090 je k dispozici v \u0438\u0441\u0445\u043e\u0434\u043d\u0438\u043a\u0430\u0445, tak\u017ee ti, kte\u0159\u00ed cht\u011bj\u00ed, mohou dokonce vytvo\u0159it vlastn\u00ed verzi Flightradar, s blackjackem a dal\u0161\u00edmi vychyt\u00e1vkami.<\/p>\n
Z\u00e1v\u011bry<\/h2>\n
\nJak vid\u00edte, nic nen\u00ed tak slo\u017eit\u00e9 a z\u00e1rove\u0148 je to docela zaj\u00edmav\u00e9 a levn\u00e9. Pro pochopen\u00ed cenov\u00e9ho rozmez\u00ed: p\u0159ed 10 lety st\u00e1l p\u0159ij\u00edma\u010d Airnav RadarBox p\u0159ibli\u017en\u011b 1000$, nyn\u00ed RTL-SDR, kter\u00fd d\u011bl\u00e1 to sam\u00e9, lze po\u0159\u00eddit za 10$.<\/p>\n
V m\u00e9m p\u0159\u00edpad\u011b byl p\u0159ij\u00edma\u010d spu\u0161t\u011bn pouze pro testov\u00e1n\u00ed, nem\u00e1 smysl jej m\u00edt trvale zapnut\u00fd, hustota pokryt\u00ed evropsk\u00e9 \u010d\u00e1sti u\u017e nyn\u00ed dosahuje 100%. Pro lidi ve vzd\u00e1len\u00fdch oblastech Ruska, naopak, to m\u016f\u017ee b\u00fdt docela zaj\u00edmav\u00e9 \u2014 objevuje se p\u0159\u00edle\u017eitost jak ud\u011blat u\u017eite\u010dnou pr\u00e1ci pro leteck\u00e9 cestovatele po cel\u00e9m sv\u011bt\u011b, roz\u0161\u00ed\u0159en\u00edm z\u00f3ny pokryt\u00ed, tak i z\u00edskat p\u0159\u00edstup k pr\u00e9miov\u00e9mu \u00fa\u010dtu v\u00fd\u0161e zm\u00edn\u011bn\u00fdch web\u016f.<\/p>\n
V\u0161em p\u0159eji \u00fasp\u011b\u0161n\u00e9 experimenty.<\/p>\n
Zdroj: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"
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