{"id":96636,"date":"2020-10-13T07:42:45","date_gmt":"2020-10-13T05:42:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/opredelyaem-napravlenie-na-aeroport-s-pomoshhyu-rtl-sdr-i-gnu-radio"},"modified":"2020-10-13T07:42:45","modified_gmt":"2020-10-13T05:42:45","slug":"opredelyaem-napravlenie-na-aeroport-s-pomoshhyu-rtl-sdr-i-gnu-radio","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/administrirovanie\/opredelyaem-napravlenie-na-aeroport-s-pomoshhyu-rtl-sdr-i-gnu-radio","title":{"rendered":"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Hell\u00f3, Habr!<\/p>\n<p>Jelenleg nem t\u00fal sok olyan kommunik\u00e1ci\u00f3s szabv\u00e1ny l\u00e9tezik, amelyek egyr\u00e9szt \u00e9rdekesek \u00e9s figyelemre m\u00e9lt\u00f3k, m\u00e1sr\u00e9szt pedig a le\u00edr\u00e1suk nem foglal el 500 oldalt PDF form\u00e1tumban. Az egyik ilyen, k\u00f6nnyen dek\u00f3dolhat\u00f3 jel a VHF Omni-directional Radio Beacon (VOR), amelyet rep\u00fcl\u00e9stechnikai navig\u00e1ci\u00f3ban haszn\u00e1lnak.<\/p>\n<p><img decoding=\"async\" alt=\"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val\" src=\"\/wp-content\/uploads\/2020\/10\/d2cb34b4e4f4d10f5805d83f68d9ca23.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>VOR Beacon (c) wikimedia.org<\/i><\/p>\n<p>Miel\u0151tt elkezden\u00e9nk, a k\u00e9rd\u00e9s az olvas\u00f3khoz: hogyan lehet a jelet \u00fagy form\u00e1lni, hogy egy ir\u00e1nyjelz\u0151 antenna seg\u00edts\u00e9g\u00e9vel meghat\u00e1rozhassuk a ir\u00e1nyt? A v\u00e1lasz a tov\u00e1bb m\u00f6g\u00f6tt.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>\u00c1ltal\u00e1nos inform\u00e1ci\u00f3<\/h2>\n<p>\nRendszer <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/VHF_omnidirectional_range\">Nagyon magas frekvenci\u00e1j\u00fa Omni-directional Tartom\u00e1ny<\/a><\/noindex> (VOR) a rep\u00fcl\u00e9stechnikai navig\u00e1ci\u00f3ban m\u00e1r az 50-es \u00e9vekt\u0151l alkalmaz\u00e1sban van, \u00e9s viszonylag kis t\u00e1vols\u00e1g\u00fa (100-200 km) r\u00e1di\u00f3jelz\u0151kb\u0151l \u00e1ll, amelyek az FM frekvencia 108-117 MHz tartom\u00e1ny\u00e1ban \u00fczemelnek. Most, a gigahertzes korszakban, a 'nagyon magas frekvencia' megnevez\u00e9s ilyen frekvenci\u00e1kra m\u00e1r viccesen hangzik, \u00e9s \u00f6nmag\u00e1ban is \u00e1rulkodik <i>a standard kor\u00e1r\u00f3l<\/i> de egy\u00e9bk\u00e9nt m\u00e9g mindig m\u0171k\u00f6dnek <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Non-directional_beacon\">NDB<\/a><\/noindex>, amelyek a k\u00f6z\u00e9pm\u00e9ret\u0171 hull\u00e1mok 400-900 kHz tartom\u00e1ny\u00e1ban m\u0171k\u00f6dnek. <\/p>\n<p>A c\u00e9lzott antenna elhelyez\u00e9se a rep\u00fcl\u0151g\u00e9pen konstrukci\u00f3s szempontb\u00f3l k\u00e9nyelmetlen, ez\u00e9rt felmer\u00fclt a feladat, hogyan lehetne a t\u00e1j\u00e9koztat\u00e1st a jelben a f\u00e9nysug\u00e1r ir\u00e1ny\u00e1r\u00f3l k\u00f3dolni. Az elv\u00e9t a 'p\u00e1lcik\u00e1kon' nagyon egyszer\u0171en lehet elmagyar\u00e1zni. K\u00e9pzelj\u00fck el, hogy van egy norm\u00e1l jelz\u0151, amely egy sz\u0171k z\u00f6ld f\u00e9nyteret bocs\u00e1t ki, amelynek l\u00e1mp\u00e1ja 1 perc alatt egyet forog. Nyilv\u00e1nval\u00f3, hogy percenk\u00e9nt l\u00e1tni fogunk egy f\u00e9nyvillan\u00e1st, de egy ilyen villan\u00e1s nem tartalmaz sok inform\u00e1ci\u00f3t. Adjunk a jelz\u0151h\u00f6z egy m\u00e1sodik <i>nem ir\u00e1ny\u00edtott<\/i> a piros sz\u00edn\u0171 l\u00e1mp\u00e1t, amely akkor villan, amikor a vil\u00e1g\u00edt\u00f3torony f\u00e9nye \"\u00e1tmegy\" az \u00e9szaki ir\u00e1nyba. Mivel a villan\u00e1sok peri\u00f3dusa \u00e9s a vil\u00e1g\u00edt\u00f3torony koordin\u00e1t\u00e1i ismertek, a piros \u00e9s z\u00f6ld villan\u00e1sok k\u00f6z\u00f6tti k\u00e9sleltet\u00e9s kisz\u00e1m\u00edt\u00e1s\u00e1val meghat\u00e1rozhatjuk az \u00e9szaki ir\u00e1nyt. Mindez egyszer\u0171. Csak annyit kell tenn\u00fcnk, hogy ugyanezt r\u00e1di\u00f3val is megval\u00f3s\u00edtjuk. Ezt f\u00e1zisv\u00e1ltoztat\u00e1ssal oldott\u00e1k meg. K\u00e9t jelet haszn\u00e1ltak a tov\u00e1bb\u00edt\u00e1shoz: az els\u0151 jel f\u00e1zisa \u00e1lland\u00f3 (referencia), a m\u00e1sodik jel (v\u00e1ltoz\u00f3) komplex m\u00f3don v\u00e1ltozik a kibocs\u00e1t\u00e1s ir\u00e1ny\u00e1t\u00f3l f\u00fcgg\u0151en \u2013 minden sz\u00f6ghez saj\u00e1t f\u00e1ziseltol\u00f3d\u00e1s tartozik. \u00cdgy minden vev\u0151 \u201esaj\u00e1t\u201d f\u00e1ziseltol\u00f3d\u00e1st kap, ami ar\u00e1nyos a vil\u00e1g\u00edt\u00f3toronyhoz m\u00e9rt azimutal. A \u201et\u00e9rbeli modul\u00e1ci\u00f3\u201d \u00e9szlel\u00e9s\u00e9t egy speci\u00e1lis antenn\u00e1val (Alford Loop, l\u00e1sd KDPV) \u00e9s egy k\u00fcl\u00f6n\u00f6sen \u00fcgyes modul\u00e1ci\u00f3val val\u00f3s\u00edtj\u00e1k meg. Ez a cikk f\u0151 t\u00e9m\u00e1ja.<\/p>\n<p>K\u00e9pzelj\u00fck el, hogy van egy hagyom\u00e1nyos, az 50-es \u00e9vek \u00f3ta m\u0171k\u00f6d\u0151 legacym\u00e1j\u00e9kunk, amely Morse-\u00e1b\u00e9c\u00e9vel jelez A m modul\u00e1ci\u00f3val. Val\u00f3sz\u00edn\u0171leg valamikor r\u00e9g, a navig\u00e1tor t\u00e9nyleg hallgatta ezeket a jeleket a f\u00fclhallgat\u00f3ban, \u00e9s m\u00e9r\u0151vonallal \u00e9s k\u00f6rz\u0151vel jegyzetelt a t\u00e9rk\u00e9pen. \u00daj funkci\u00f3kat szeretn\u00e9nk hozz\u00e1adni a jelhez an\u00e9lk\u00fcl, hogy \u201emegszak\u00edtan\u00e1nk\u201d a r\u00e9gi kompatibilit\u00e1st. A t\u00e9ma ismer\u0151s, semmi nem \u00faj\u2026 A k\u00f6vetkez\u0151 m\u00f3don val\u00f3sult meg \u2013 az AM jelhez egy alacsony frekvenci\u00e1j\u00fa 30 Hz-es hangot adtak, amely referenciaf\u00e1zis kukac szerep\u00e9t t\u00f6lti be, \u00e9s egy magas frekvenci\u00e1j\u00fa komponenst, amelyet 9.96 kHz-es frekvenciamodul\u00e1ci\u00f3s k\u00f3dolt, tov\u00e1bb\u00edtva a v\u00e1ltoz\u00f3 f\u00e1zisjelz\u00e9st. K\u00e9t jelet kiemelve \u00e9s a f\u00e1zisokat \u00f6sszehasonl\u00edtva megkapjuk a keresett sz\u00f6get 0 \u00e9s 360 fok k\u00f6z\u00f6tt, amely a sz\u00fcks\u00e9ges azimut. Mindez nem zavarja az \u201e\u00e1ltal\u00e1nos\u201d vil\u00e1g\u00edt\u00f3torony hallgat\u00e1s\u00e1t, \u00e9s a r\u00e9gi AM vev\u0151kkel is kompatibilis marad. <\/p>\n<p>T\u00e9rj\u00fcnk \u00e1t a gyakorlatra. Ind\u00edtsunk el egy SDR vev\u0151t, v\u00e1lasszunk AM modul\u00e1ci\u00f3t \u00e9s 12 kHz-es s\u00e1vsz\u00e9less\u00e9get. A VOR vil\u00e1g\u00edt\u00f3tornyok frekvenci\u00e1i k\u00f6nnyen megtal\u00e1lhat\u00f3k az interneten. A jel spektrumon a k\u00f6vetkez\u0151k\u00e9ppen n\u00e9z ki:<\/p>\n<p><img decoding=\"async\" alt=\"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val\" src=\"\/wp-content\/uploads\/2020\/10\/0c3ce8f56cf66d9f42aea0d7a41a1cc9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEbben az esetben a vil\u00e1g\u00edt\u00f3torony jele a 113.950 MHz frekvenci\u00e1n ker\u00fcl tov\u00e1bb\u00edt\u00e1sra. A k\u00f6z\u00e9pen j\u00f3l l\u00e1that\u00f3 az amplit\u00fad\u00f3modul\u00e1ci\u00f3s vonal \u00e9s a Morse-\u00e1b\u00e9c\u00e9vel \u00e1tk\u00f3dolt jelek (.- \u2014 \u2026 ami AMS-t jelent, Amsterdam, Schiphol rep\u00fcl\u0151t\u00e9r). A hordoz\u00f3t\u00f3l 9.6 kHz t\u00e1vols\u00e1gra k\u00e9t cs\u00facs l\u00e1that\u00f3, amelyek a m\u00e1sodik jelet tov\u00e1bb\u00edtj\u00e1k. <\/p>\n<p>R\u00f6gz\u00edts\u00fck a jelet WAV form\u00e1tumban (nem MP3 \u2014 a vesztes\u00e9ges t\u00f6m\u00f6r\u00edt\u00e9s \"meg\u00f6li\" a jel teljes szerkezet\u00e9t), \u00e9s nyissuk meg a GNU Radioban.<\/p>\n<h2>Dek\u00f3dol\u00e1s<\/h2>\n<p>\n<b>1. l\u00e9p\u00e9s<\/b>. Nyissuk meg a r\u00f6gz\u00edtett jelf\u00e1jlt, \u00e9s alkalmazzunk r\u00e1 alacsony \u00e1tereszt\u0151 sz\u0171r\u0151t, hogy megkapjuk az els\u0151 referenciajelet. A GNU Radio grafikonja a k\u00e9pen l\u00e1that\u00f3.<\/p>\n<p><img decoding=\"async\" alt=\"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val\" src=\"\/wp-content\/uploads\/2020\/10\/9f4c9f41ca6daaf7ad01d635c7c0983f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nEredm\u00e9ny: alacsony frekvenci\u00e1j\u00fa jel 30 Hz-en.<\/p>\n<p><img decoding=\"async\" alt=\"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val\" src=\"\/wp-content\/uploads\/2020\/10\/c41754fc282773d82bf1c18243790f91.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<b>2. l\u00e9p\u00e9s<\/b>: dek\u00f3doljuk a v\u00e1ltoz\u00f3 f\u00e1zis\u00fa jelet. Amint eml\u00edtett\u00fck, ez 9.96 kHz frekvenci\u00e1n helyezkedik el, ezt null\u00e1ra kell \u00e1thelyezn\u00fcnk, majd egy FM-demodul\u00e1torra kell csatlakoztatnunk.<\/p>\n<p>GNU Radio grafikon:<\/p>\n<p><img decoding=\"async\" alt=\"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val\" src=\"\/wp-content\/uploads\/2020\/10\/b9ed97cf96ff37e6e4499e65dfabcead.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nMinden megoldva. K\u00e9t jelet l\u00e1tunk, amelynek f\u00e1zisk\u00fcl\u00f6nbs\u00e9ge jelzi a v\u00e9teli pontr\u00f3l a VOR-jelad\u00f3ig terjed\u0151 sz\u00f6get:<\/p>\n<p><img decoding=\"async\" alt=\"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val\" src=\"\/wp-content\/uploads\/2020\/10\/f4e5b8ed21ba562c01deb583524910c0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA jel el\u00e9g zavaros, \u00e9s a f\u00e1zisk\u00fcl\u00f6nbs\u00e9g v\u00e9gs\u0151 sz\u00e1m\u00edt\u00e1s\u00e1hoz additional filtering may be needed, de a l\u00e9nyeg rem\u00e9lem, vil\u00e1gos. Akik elfelejtett\u00e9k, hogyan hat\u00e1rozz\u00e1k meg a f\u00e1zisk\u00fcl\u00f6nbs\u00e9get, itt egy k\u00e9p a <noindex><a rel=\"nofollow\" href=\"https:\/\/aviation.stackexchange.com\/questions\/33834\/what-causes-the-phase-to-change-in-a-vor\">aviation.stackexchange.com<\/a><\/noindex>:<\/p>\n<p><img decoding=\"async\" alt=\"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val\" src=\"\/wp-content\/uploads\/2020\/10\/529ab3d50c6002b8246f2528e4128c63.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSzerencs\u00e9re mindezt manu\u00e1lisan nem kell elv\u00e9gezni: m\u00e1r l\u00e9tezik egy <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/martinber\/vor-python-decoder\">k\u00e9sz projekt<\/a><\/noindex> Python-ban, amely VOR jeleket dek\u00f3dol WAV f\u00e1jlokb\u00f3l. Val\u00f3j\u00e1ban ennek tanulm\u00e1nyoz\u00e1sa \u00e9s az inspir\u00e1lt ez a t\u00e9ma megismer\u00e9s\u00e9re.<\/p>\n<p>Az \u00e9rdekl\u0151d\u0151k futtathatj\u00e1k a programot a konzolon, \u00e9s a m\u00e1r r\u00f6gz\u00edtett f\u00e1jlb\u00f3l k\u00e9sz sz\u00f6get kaphatnak fokban:<\/p>\n<p><img decoding=\"async\" alt=\"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val\" src=\"\/wp-content\/uploads\/2020\/10\/a8314406755294ba96c28fd7cbdd94da.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nA l\u00e9gik\u00f6zleked\u00e9s rajong\u00f3i ak\u00e1r egy hordozhat\u00f3 vev\u0151t is k\u00e9sz\u00edthetnek RTL-SDR-b\u0151l \u00e9s Raspberry Pi-b\u00f3l. Egy\u00e9bk\u00e9nt a \"val\u00f3di\" rep\u00fcl\u0151g\u00e9pen ez az indik\u00e1tor k\u00f6r\u00fclbel\u00fcl \u00edgy n\u00e9z ki:<\/p>\n<p><img decoding=\"async\" alt=\"Ir\u00e1ny\u00edtjuk a rep\u00fcl\u0151teret RTL-SDR \u00e9s GNU Radio alkalmaz\u00e1s\u00e1val\" src=\"\/wp-content\/uploads\/2020\/10\/04163d9dfd1ae681128745fc7e4158b7.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nK\u00e9p &copy; <noindex><a rel=\"nofollow\" href=\"https:\/\/www.aopa.org\">www.aopa.org<\/a><\/noindex><\/p>\n<h2>Z\u00e1r\u00e1s<\/h2>\n<p>\nAz ilyen \"t\u00edz \u00e9vvel ezel\u0151tti\" jelek hat\u00e1rozottan \u00e9rdekesek az elemz\u00e9shez. El\u0151sz\u00f6r is, el\u00e9g egyszer\u0171ek, a modern DRM vagy ann\u00e1l ink\u00e1bb a GSM m\u00e1r nem dek\u00f3dolhat\u00f3 \u00edgy \"k\u00e9t k\u00e9zzel\". Nyitottak a v\u00e9telre, nincs benn\u00fck kulcs \u00e9s titkos\u00edt\u00e1s. M\u00e1sodszor, lehets\u00e9ges, hogy a j\u00f6v\u0151ben elt\u0171nnek a t\u00f6rt\u00e9nelemb\u0151l, \u00e9s helyettes\u00edtik \u0151ket m\u0171holdas navig\u00e1ci\u00f3val \u00e9s modernebb digit\u00e1lis rendszerekkel. Harmadszor, az ilyen szabv\u00e1nyok tanulm\u00e1nyoz\u00e1sa lehet\u0151v\u00e9 teszi, hogy \u00e9rdekes technikai \u00e9s t\u00f6rt\u00e9nelmi r\u00e9szleteket tudjunk meg arr\u00f3l, hogyan oldott\u00e1k meg a feladatokat a m\u00falt sz\u00e1zad m\u00e1s schematics \u00e9s elemek seg\u00edts\u00e9g\u00e9vel. Ez\u00e9rt a vev\u0151 tulajdonosainak javasolhatjuk, hogy vegy\u00e9k \u00e9szre ezeket a jeleket, am\u00edg m\u00e9g m\u0171k\u00f6dnek.<\/p>\n<p>Mint mindig, mindenki sz\u00e1m\u00e1ra sikeres k\u00eds\u00e9rletez\u00e9st k\u00edv\u00e1nok.<br \/>\n<br \/>Forr\u00e1s: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/522828\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0440\u0438\u0432\u0435\u0442, \u0425\u0430\u0431\u0440! \u0412 \u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0435\u0435 \u0432\u0440\u0435\u043c\u044f \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u0435\u0442 \u043d\u0435 \u0442\u0430\u043a \u0443\u0436 \u043c\u043d\u043e\u0433\u043e \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043e\u0432 \u0441\u0432\u044f\u0437\u0438, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0441 \u043e\u0434\u043d\u043e\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b, \u043b\u044e\u0431\u043e\u043f\u044b\u0442\u043d\u044b \u0438 \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u044b, \u0441 \u0434\u0440\u0443\u0433\u043e\u0439 \u0441\u0442\u043e\u0440\u043e\u043d\u044b, \u0438\u0445 \u043e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u043d\u0435 \u0437\u0430\u043d\u0438\u043c\u0430\u0435\u0442 500 \u0441\u0442\u0440\u0430\u043d\u0438\u0446 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 PDF. \u041e\u0434\u043d\u0438\u043c \u0438\u0437 \u0442\u0430\u043a\u0438\u0445, \u043d\u0435\u0441\u043b\u043e\u0436\u043d\u044b\u0445 \u0434\u043b\u044f \u0434\u0435\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f, \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0441\u0438\u0433\u043d\u0430\u043b VHF Omni-directional Radio Beacon (VOR), \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u0439 \u0432 \u0430\u044d\u0440\u043e\u043d\u0430\u0432\u0438\u0433\u0430\u0446\u0438\u0438. 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