{"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 suuna lennujaama RTL-SDR ja GNU Radio abil","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Tere, Habr!<\/p>\n<p>Praegu on olemas \u00fcsna v\u00e4he side standardeid, mis \u00fchel poolt on huvitavad ja t\u00e4helepanuv\u00e4\u00e4rsed, teiselt poolt ei vaja nende kirjeldamine 500-lehek\u00fcljelist PDF-dokumenti. \u00dcks selline, kergesti de\u0161ifreeritav signaal on VHF Omni-directional Radio Beacon (VOR), mida kasutatakse \u00f5hutranspordis.<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame suuna lennujaama RTL-SDR ja GNU Radio abil\" 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 suunamata vastuv\u00f5tja antenniga saaks kindlaks teha suunda? Vastus on allpool.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h2>\u00dclevaade<\/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 \u00f5hutranspordis kasutusel olnud alates 1950. aastatest ning koosneb suhteliselt l\u00fchikese ulatusega (100-200 km) raadiomajaidest, mis t\u00f6\u00f6tavad sagedusalas UHF 108-117 MHz. Praegu, gigahertside ajastul, k\u00f5lab very high frequency nende sageduste kohta veidi naljakalt ja \u00fctleb rohkem kui piisavalt <i>selle standardi vanusest<\/i> , aga muide, 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, on endiselt aktiivsed. <\/p>\n<p>Suunatud antenni paigaldamine lennukile on konstruktiivselt ebamugav, seet\u00f5ttu tekkis \u00fclesanne, kuidas kodeerida signaalis teavet suuna kohta majakale. T\u00f6\u00f6p\u00f5him\u00f5tet saab seletada j\u00e4rgmiselt. Kujutame ette tavalist majakat, mis kiirgab kitsast roheline valgust, mille lamp p\u00f6\u00f6rleb 1 kord minutis. Ilmselgelt n\u00e4eme me kord minutis valguse s\u00e4hvatust, kuid \u00fcks selline s\u00e4hvatus ei kanna palju teavet. Lisame majakale teise <i>suunamata<\/i> punane lamp, mis v\u00e4lgub hetkel, kui tuletorni valgus \"l\u00e4bib\" p\u00f5hja suuna. Kuna v\u00e4lgude periood ja tuletorni koordinaadid on teada, saab punase ja rohelise v\u00e4lgu vahemaa m\u00f5\u00f5tmisega v\u00e4lja arvutada azimuti p\u00f5hja suunas. K\u00f5ik on lihtne. J\u00e4\u00e4nud on teha sama, kuid raadiotehnoloogia abil. See lahendati faaside muutmisega. Edastamiseks kasutatakse kahte signaali: esimese faas on konstantne (reference), teise (variable) faas muutub keeruliselt vastavalt kiirituule suunale - igale nurgale vastab oma faasi nihke. Seel\u00e4bi saab iga vastuv\u00f5tja signaali oma faasi nihkega, mis on proportsionaalne tuletorni azimutile. \"Ruumi modulatsiooni\" tehnoloogia teostatakse spetsiaalse antenni (Alford Loop, vt KDPV) ja eriliste, \u00fcsna nutikate modulatsioonide abil. Just see ongi selle artikli teema.<\/p>\n<p>Kujutame ette, et meil on tavaline p\u00e4randty\u00f6imerkki, mis on t\u00f6\u00f6tanud alates 50. aastatest ja edastab signaale tavalises AM-modulatsioonis Morze t\u00e4hestikus. Ilmselt kuulas kunagi navigator t\u00f5eliselt neid signaale k\u00f5rvaklappides ja m\u00e4rkis suundi joonlaua ja kompassiga kaardile. Tahame lisada signaalile uusi funktsioone, kuid nii, et see ei rikuks vanade seadmete \u00fchilduvust. Teema on tuttav, mitte midagi uut... See viidi ellu j\u00e4rgmiselt \u2014 AM-signaalile lisati madallsageduslik 30 Hz toon, mis toimib reference-phase signaalina, ning k\u00f5rgsageduslik komponent, mis on kodeeritud sagedusmodulatsioonis sagedusel 9.96 kHz, edastades variable phase signaali. Erakordides kaks signaali ja v\u00f5rreldes faase, saame otsitava nurga vahemikus 0 kuni 360 kraadi, mis on vajalik azimut. Samal ajal ei takista see kuulata majakat \"tavalisel viisil\" ja j\u00e4\u00e4b \u00fchilduvaks vanade AM-vastuv\u00f5tjatega. <\/p>\n<p>Liigume teooriast praktikas. K\u00e4ivitame SDR-vastuv\u00f5tja, valime AM-modulatsiooni ja ribalaiuseks 12 kHz. VOR-majakate sagedusi saab kergesti internetist leida. Spektris n\u00e4eb signaal v\u00e4lja j\u00e4rgmiselt:<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame suuna lennujaama RTL-SDR ja GNU Radio abil\" src=\"\/wp-content\/uploads\/2020\/10\/0c3ce8f56cf66d9f42aea0d7a41a1cc9.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSelles juhul edastatakse maam\u00e4rgi signaal sagedusel 113.950 MHz. Keskuses on selgelt eristatav amplituudmodulatsiooni joon ja Morse'aabitsat n\u00e4itavad signaalid (.- \u2014 \u2026 mis t\u00e4hendab AMS, Amsterdam, lennujaam Schiphol). \u00dcmberringi, 9.6 kHz kandis, on n\u00e4htavad kaks piiki, mis edastavad teist signaali. <\/p>\n<p>Salvestame signaali WAV-formaadis (mitte MP3 \u2014 kadudega kompresseerimine \"h\u00e4vitab\" signaali struktuuri) ja avame selle GNU Radios.<\/p>\n<h2>Dekodeerimine<\/h2>\n<p>\n<b>Samm 1<\/b>. Avame salvestatud signaaliga faili ja rakendame sellele madalfrequencies filtrit, et saada esimene reference-signaal. GNU Radio graafik on n\u00e4idatud joonisel.<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame suuna lennujaama RTL-SDR ja GNU Radio abil\" 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 suuna lennujaama RTL-SDR ja GNU Radio abil\" 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 varem mainitud, asub see sagedusel 9.96 kHz, peame viima selle nullsagedusele ja andma FM-demodulaatorile.<\/p>\n<p>GNU Radio graafik:<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame suuna lennujaama RTL-SDR ja GNU Radio abil\" src=\"\/wp-content\/uploads\/2020\/10\/b9ed97cf96ff37e6e4499e65dfabcead.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nN\u00fc\u00fcd on \u00fclesanne lahendatud. N\u00e4eme kahte signaali, mille faasi erinevus n\u00e4itab nurka vastuv\u00f5tjast VOR-majakani:<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame suuna lennujaama RTL-SDR ja GNU Radio abil\" src=\"\/wp-content\/uploads\/2020\/10\/f4e5b8ed21ba562c01deb583524910c0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSignaal on piisavalt m\u00fcrane ja faasi erinevuse l\u00f5plikuks arvutamiseks v\u00f5ib olla vajalik t\u00e4iendav filtreerimine, kuid p\u00f5him\u00f5te, loodan, on selge. Neile, kes on unustanud, kuidas faasi erinevus m\u00e4\u00e4ratakse, pilt <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 suuna lennujaama RTL-SDR ja GNU Radio abil\" src=\"\/wp-content\/uploads\/2020\/10\/529ab3d50c6002b8246f2528e4128c63.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00d5nneks ei pea k\u00f5ike seda k\u00e4sitsi tegema: juba on 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 mind selle uurimine selle teema uurimiseks.<\/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 suuna lennujaama RTL-SDR ja GNU Radio abil\" src=\"\/wp-content\/uploads\/2020\/10\/a8314406755294ba96c28fd7cbdd94da.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nLennunduse f\u00e4nnid saavad isegi ehitada endale kaasaskantava vastuv\u00f5tja RTL-SDR ja Raspberry Pi-st. Muide, \u201ep\u00e4ris\u201c lennukis n\u00e4eb see indikaator v\u00e4lja umbes nii:<\/p>\n<p><img decoding=\"async\" alt=\"M\u00e4\u00e4rame suuna lennujaama RTL-SDR ja GNU Radio abil\" 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 \u201emineviku\u201d signaalid on kindlasti huvitavad anal\u00fc\u00fcsimiseks. Esiteks, need on piisavalt lihtsad, modernne DRM v\u00f5i veelgi enam GSM, nii ei saa neid enam \u201en\u00e4puga n\u00e4idata\u201d dekodeerida. Need on vastuv\u00f5tuks avatud, neis pole v\u00f5tmeid ega kr\u00fcptograafiat. Teiseks, tulevikus v\u00f5ivad need minna ajalukku ja asenduda satelliitnavigation ja kaasaegsemate digitaalsete s\u00fcsteemidega. Kolmandaks, selliste standardite uurimine v\u00f5imaldab teada huvitavaid tehnilisi ja ajaloolisi detaile, kuidas \u00fclesandeid lahendati eelmise sajandi erineva skeemitehnika ja elementide baasil. Seega v\u00f5iks vastuv\u00f5tjate omanikele soovitada selliseid signaale vastu v\u00f5tta, seni kuni need veel t\u00f6\u00f6tavad.<\/p>\n<p>Nagu alati, soovin k\u00f5igile edukat 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. 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