{"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\/et\/blog\/administrirovanie\/opredelyaem-napravlenie-na-aeroport-s-pomoshhyu-rtl-sdr-i-gnu-radio","title":{"rendered":"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Tere, Habr!<\/p>\n<p>Praegu on olemas vaid v\u00e4he sidestandardeid, mis \u00fchelt poolt on huvitavad ja innovaatilised, teiselt poolt nende kirjeldamine ei v\u00f5ta 500 lehek\u00fclge PDF-formaadis. \u00dcks selline lihtne dekodeerimisega signaal on VHF-\u00fcldsuuna raadiomajakas (VOR), mida kasutatakse \u00f5hus navigeerimisel.<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio\" 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>K\u00fcsimus lugejatele \u2014 kuidas moodustada signaal nii, et suuna m\u00e4\u00e4ramine oleks v\u00f5imalik kasutades suunamata vastuv\u00f5tuantenni? Vastus all.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>\u00dcldine teave<\/h2>\n<p>\nS\u00fcsteem <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/VHF_omnidirectional_range\">Very high frequency Omni-directional Range<\/a><\/noindex> (VOR) on \u00f5hus navigeerimise jaoks kasutusel olnud juba 1950. aastatest ja koosneb suhteliselt v\u00e4ikese ulatusega (100-200 km) raadiomajakatest, mis t\u00f6\u00f6tavad UHF sageduste vahemikus 108-117 MHz. Praegu, gigahertsiajal, k\u00f5lab very high frequency neile sagedustele naljakalt ja r\u00e4\u00e4gib iseenesest <i>standardi vanusest<\/i> aga muide t\u00f6\u00f6tavad endiselt majakad <noindex><a rel=\"nofollow\" href=\"https:\/\/en.wikipedia.org\/wiki\/Non-directional_beacon\">NDB<\/a><\/noindex>, mis t\u00f6\u00f6tavad keskmise laine vahemikus 400-900 kHz. <\/p>\n<p>Suunatud antenni paigutamine lennukisse on konstruktiivselt ebamugav, seega tekkis \u00fclesanne, kuidas kodeerida signaali suunainformatsioon majaka suunas. T\u00f6\u00f6p\u00f5him\u00f5tet saab lihtsalt selgitada j\u00e4rgmiselt. Kujutage ette, et meil on tavaline majakas, mis saadab kitsast rohelise valguse kiirt, mille lamp p\u00f6\u00f6rdub korra minutis. Ilmselgelt n\u00e4eme korra minutis valguse s\u00e4hvatust, kuid \u00fcks s\u00e4de ei kanna palju teavet. Lisame majakale teise <i>suunamata<\/i> punane lamp, mis s\u00fcttib hetkel, kui majaka beam \"l\u00e4bib\" suunda p\u00f5hja. Kuna v\u00e4lgutusperiood ja majaka koordinaadid on teada, saab punase ja rohelise v\u00e4lgatuspinge viivituse arvutamisega m\u00e4\u00e4rata suuna p\u00f5hja. K\u00f5ik on lihtne. J\u00e4\u00e4nud on teha sama, ainult raadio abil. See lahendati faaside muutmise teel. Edastamiseks kasutatakse kaht signaali: esimese faas on konstantne (reference), teise (variable) faas muutub keerukal viisil s\u00f5ltuvalt kiirgussuunast \u2014 igale nurkadele vastab oma faasisiirde. Sel viisil saab iga vastuv\u00f5tja signaali \"oma\" faasisiirde, mis on proportsionaalne majaka suunaga. \"Ruumilise modulatsiooni\" tehnoloogia teostatakse spetsiaalse antenni (Alford Loop, vt KDPV) ja eriliku, \u00fcsna keerulise modulatsiooni abil. Just see ongi selle artikli teema.<\/p>\n<p>Kujutame ette, et meil on tavaline legacy-majakas, mis t\u00f6\u00f6tab alates 50ndatest ja edastab signaale tavap\u00e4rases AM-modulatsioonis Morse'i t\u00e4hestikus. T\u00f5en\u00e4oliselt kuulas kunagi soorik need signaalid k\u00f5rvaklappidega ja m\u00e4rkis suunad joonlauaga ja kompassiga kaardile. Soovime lisada signaalile uusi funktsioone, kuid nii, et \"ei rikuks\" vanadega \u00fchilduvust. Teema on tuttav, midagi ei ole uut ... See tehti j\u00e4rgmiselt \u2014 AM-signaalile lisati madalsageduslik 30 Hz toon, mis t\u00e4idab reference-phase signaali funktsiooni, ja k\u00f5rgsageduslik komponent, millel on sagedusmodulatsioon 9,96 kHz, edastades variable phase signaali. Erakonnaga kahte signaali ja v\u00f5rreldes faase, saame soovitud nurga 0 kuni 360 kraadi, mis on vajalik azimuth. Samal ajal ei sega see tavalist majakat \"tavalisel viisil\" kuulamast ja j\u00e4\u00e4b \u00fchilduvaks vanade AM-vastuv\u00f5tjatega. <\/p>\n<p>Liigume teooriast praktikale. K\u00e4ivitame SDR-vastuv\u00f5tja, valime AM-modulatsiooni ja ribalaiuse 12 kHz. VOR-majakate sagedused on internetis h\u00f5lpsasti leiduvad. Spektris n\u00e4eb signaal j\u00e4rgmise kujuga:<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio\" src=\"\/wp-content\/uploads\/2020\/10\/0c3ce8f56cf66d9f42aea0d7a41a1cc9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAntud juhul edastatakse majaka signaal sagedusel 113,950 MHz. Keskosas on selgelt \u00e4ratuntav amplituudmodulatsiooni joon ja Morse'i signaalid (.- \u2014 \u2026 mis t\u00e4hendab AMS, Amsterdam, lennujaam Schiphol). \u00dcmbritsevalt 9,6 kHz kaugusel kandva sageduse juurest on n\u00e4ha kahte t\u00f5usu, edastades teist signaali. <\/p>\n<p>Salvestame signaali WAV formaadis (mitte MP3 \u2014 kadudega kompressioon h\u00e4vitab kogu signaali struktuuri) ja avame selle GNU Radios.<\/p>\n<h2>Dekodeerimine<\/h2>\n<p>\n<b>Samm 1<\/b>. Avame salvestatud signaali faili ja rakendame sellele madalsagedusfiltri, et saada esimene reference-signaal. GNU Radio graafik on n\u00e4idatud joonisel.<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio\" src=\"\/wp-content\/uploads\/2020\/10\/9f4c9f41ca6daaf7ad01d635c7c0983f.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nTulemus: madalsageduslik signaal sagedusega 30 Hz.<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio\" src=\"\/wp-content\/uploads\/2020\/10\/c41754fc282773d82bf1c18243790f91.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<b>Samm 2<\/b>: dekodeerime variable phase signaali. Nagu eelnevalt mainitud, asub see sagedusel 9.96 kHz, peame selle viima nullsagedusele ja edastama FM-demodulaatorile.<\/p>\n<p>GNU Radio graafik:<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio\" src=\"\/wp-content\/uploads\/2020\/10\/b9ed97cf96ff37e6e4499e65dfabcead.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nK\u00f5ik, \u00fclesanne on lahendatud. N\u00e4eme kahte signaali, mille faasivahe n\u00e4itab nurka vastuv\u00f5tjast kuni VOR-majakani:<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio\" src=\"\/wp-content\/uploads\/2020\/10\/f4e5b8ed21ba562c01deb583524910c0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSignaal on piisavalt m\u00fcrarikas ja l\u00f5pliku faasivahe arvutamiseks v\u00f5ib olla vajalik t\u00e4iendav filtreerimine, kuid loodan, et printsiip on selge. Neile, kes unustasid, kuidas faasivahet m\u00e4\u00e4ratletakse, pilt aadressilt <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=\"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio\" src=\"\/wp-content\/uploads\/2020\/10\/529ab3d50c6002b8246f2528e4128c63.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00d5nneks ei pea k\u00f5ik seda k\u00e4sitsi tegema: juba olemas <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/martinber\/vor-python-decoder\">valmis projekt<\/a><\/noindex> Pythonis, mis dekodeerib VOR-signaale WAV-failidest. Tegelikult inspireeris selle uurimine mind selle teema uurimisele.<\/p>\n<p>Soovijad saavad programmi k\u00e4ivitada konsoolis ja saada valmis nurga kraadides juba salvestatud failist:<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio\" src=\"\/wp-content\/uploads\/2020\/10\/a8314406755294ba96c28fd7cbdd94da.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLennuf\u00e4nnid v\u00f5ivad isegi teha endale kaasaskantava vastuv\u00f5tja RTL-SDR ja Raspberry Pi-st. Muide, \"p\u00e4ris\" lennukis n\u00e4eb see indikaator v\u00e4lja umbes selline:<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame sihtkoha lennujaama, kasutades RTL-SDR ja GNU Radio\" src=\"\/wp-content\/uploads\/2020\/10\/04163d9dfd1ae681128745fc7e4158b7.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\nPilt &copy; <noindex><a rel=\"nofollow\" href=\"https:\/\/www.aopa.org\">www.aopa.org<\/a><\/noindex><\/p>\n<h2>Kokkuv\u00f5te<\/h2>\n<p>\nSarnased signaalid \"m\u00f6\u00f6dunud sajandist\" on kindlasti huvitavad anal\u00fc\u00fcsimiseks. Esiteks, nad on piisavalt lihtsad, kaasaegset DRM-i v\u00f5i veelgi enam GSM-i ei saa sel viisil dekodeerida. Need on avatud vastuv\u00f5tmiseks, neis pole v\u00f5tmeid ega kr\u00fcptograafiat. Teiseks, on v\u00f5imalik, et tulevikus nad kaovad ajalukku ja asendatakse satelliitnavigeerimise ja kaasaegsemate digitaals\u00fcsteemidega. Kolmandaks, selliste standardite uurimine v\u00f5imaldab teada huvitavaid tehnilisi ja ajaloolisi \u00fcksikasju selle kohta, kuidas probleeme lahendati erineva skeemitehnika ja elementide alusel m\u00f6\u00f6dunud sajandil. Seega v\u00f5ib vastuv\u00f5tja omanikele soovitada selliseid signaale vastu v\u00f5tta, kuni nad veel t\u00f6\u00f6tavad.<\/p>\n<p>Nagu tavaliselt, soovin k\u00f5ikidele head katsetamist.<br \/>\n<br \/>Allikas: <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. VOR Beacon (\u0441) wikimedia.org \u0414\u043b\u044f \u043d\u0430\u0447\u0430\u043b\u0430 \u0432\u043e\u043f\u0440\u043e\u0441 \u0447\u0438\u0442\u0430\u0442\u0435\u043b\u044f\u043c [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":96637,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-96636","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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.\" \/>\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\/et\/blog\/administrirovanie\/opredelyaem-napravlenie-na-aeroport-s-pomoshhyu-rtl-sdr-i-gnu-radio\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 5.0.1.1\" \/>\n\t\t<meta property=\"og:locale\" content=\"et_EE\" \/>\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\udd47\u041e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u043c \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043d\u0430 \u0430\u044d\u0440\u043e\u043f\u043e\u0440\u0442 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e RTL-SDR \u0438 GNU Radio | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\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.\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/opredelyaem-napravlenie-na-aeroport-s-pomoshhyu-rtl-sdr-i-gnu-radio\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2020-10-13T05:42:45+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2020-10-13T05:42:45+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47M\u00e4\u00e4rame lennujaama suuna RTL-SDR ja GNU Radio abil | ProHoster","description":"Tere, Habr! 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