{"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\/cs\/blog\/administrirovanie\/opredelyaem-napravlenie-na-aeroport-s-pomoshhyu-rtl-sdr-i-gnu-radio","title":{"rendered":"Ur\u010dujeme sm\u011br k leti\u0161ti pomoc\u00ed RTL-SDR a GNU Radio","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ahoj, Habr!<\/p>\n

V sou\u010dasnosti existuje jen n\u011bkolik standard\u016f komunikace, kter\u00e9 jsou na jedn\u00e9 stran\u011b zaj\u00edmav\u00e9 a fascinuj\u00edc\u00ed, ale na druh\u00e9 stran\u011b jejich popis nezabere 500 stran v PDF form\u00e1tu. Jedn\u00edm z takov\u00fdch, snadno dek\u00f3dovateln\u00fdch, je sign\u00e1l VHF Omni-directional Radio Beacon (VOR), pou\u017e\u00edvan\u00fd v leteck\u00e9 navigaci.<\/p>\n

\"Ur\u010dujeme
\nVOR Beacon (c) wikimedia.org<\/i><\/p>\n

Nejprve ot\u00e1zka pro \u010dten\u00e1\u0159e - jak vytvo\u0159it sign\u00e1l tak, aby bylo mo\u017en\u00e9 pomoc\u00ed nenam\u00ed\u0159en\u00e9 p\u0159ij\u00edmac\u00ed ant\u00e9ny ur\u010dovat sm\u011br? Odpov\u011b\u010f uvnit\u0159.
\n<\/a><\/noindex><\/p>\n

Obecn\u00e9 informace<\/h2>\n

\nSyst\u00e9m Very high frequency Omni-directional Range<\/a><\/noindex> (VOR) se pou\u017e\u00edv\u00e1 v leteck\u00e9 navigaci u\u017e od 50. let minul\u00e9ho stolet\u00ed a skl\u00e1d\u00e1 se z r\u00e1diov\u00fdch maj\u00e1k\u016f relativn\u011b mal\u00e9 vzd\u00e1lenosti (100-200 km), kter\u00e9 pracuj\u00ed v rozsahu frekvenc\u00ed VHF 108-117 MHz. Dnes, v \u00e9\u0159e gigahertz\u016f, zn\u00ed n\u00e1zev very high frequency pro takov\u00e9 frekvence legra\u010dn\u011b a s\u00e1m o sob\u011b napov\u00edd\u00e1 o st\u00e1\u0159\u00ed<\/i> tohoto standardu, ale mimochodem, st\u00e1le funguj\u00ed maj\u00e1ky NDB<\/a><\/noindex>, kter\u00e9 pracuj\u00ed v rozsahu st\u0159edn\u00edch vln 400-900 kHz. <\/p>\n

Um\u00edst\u011bn\u00ed sm\u011brov\u00e9 ant\u00e9ny na letadle je konstruk\u010dn\u011b obt\u00ed\u017en\u00e9, proto vznikl \u00fakol, jak zak\u00f3dovat v samotn\u00e9m sign\u00e1lu informace o sm\u011bru k maj\u00e1ku. Princip fungov\u00e1n\u00ed lze \u201ena prstech\u201c vysv\u011btlit n\u00e1sleduj\u00edc\u00edm zp\u016fsobem. P\u0159edstavme si, \u017ee m\u00e1me b\u011b\u017en\u00fd maj\u00e1k, kter\u00fd vys\u00edl\u00e1 \u00fazk\u00fd paprsek zelen\u00e9ho sv\u011btla, jeho\u017e lampa se ot\u00e1\u010d\u00ed jednou za minutu. Je o\u010dividn\u00e9, \u017ee jednou za minutu uvid\u00edme z\u00e1blesk sv\u011btla, ale jeden takov\u00fd z\u00e1blesk nesm\u00ed mnoho informac\u00ed. P\u0159id\u00e1me k maj\u00e1ku druhou nenam\u00ed\u0159enou<\/i> \u010dervenou lampu, kter\u00e1 se rozsv\u00edt\u00ed v okam\u017eiku, kdy paprsek maj\u00e1ku \"proch\u00e1z\u00ed\" sm\u011brem na sever. Vzhledem k tomu, \u017ee je zn\u00e1m interval z\u00e1blesk\u016f a sou\u0159adnice maj\u00e1ku, lze spo\u010d\u00edtat zpo\u017ed\u011bn\u00ed mezi \u010derven\u00fdmi a zelen\u00fdmi z\u00e1blesky a zjistit azimut na sever. Je to jednoduch\u00e9. Zb\u00fdv\u00e1 ud\u011blat to sam\u00e9, ale pomoc\u00ed r\u00e1dia. To bylo vy\u0159e\u0161eno pomoc\u00ed zm\u011bny f\u00e1z\u00ed. Pro p\u0159enos se pou\u017e\u00edvaj\u00ed dva sign\u00e1ly: f\u00e1ze prvn\u00edho je konstantn\u00ed (reference), f\u00e1ze druh\u00e9ho (prom\u011bnliv\u00e1) se m\u011bn\u00ed slo\u017eit\u00fdm zp\u016fsobem v z\u00e1vislosti na sm\u011bru vyza\u0159ov\u00e1n\u00ed \u2014 ka\u017ed\u00e9mu \u00fahlu odpov\u00edd\u00e1 ur\u010dit\u00fd posun f\u00e1ze. Takto ka\u017ed\u00fd p\u0159ij\u00edma\u010d obdr\u017e\u00ed sign\u00e1l se \"sv\u00fdm\" posunem f\u00e1ze, \u00fam\u011brn\u00fdm azimutu k maj\u00e1ku. Technologie \"prostorov\u00e9 modulace\" se realizuje pomoc\u00ed speci\u00e1ln\u00ed ant\u00e9ny (Alford Loop, viz KDPV) a zvl\u00e1\u0161tn\u00ed, pom\u011brn\u011b chytr\u00e9 modulace. Ta je vlastn\u011b t\u00e9matem tohoto \u010dl\u00e1nku.<\/p>\n

P\u0159edstavme si, \u017ee m\u00e1me b\u011b\u017en\u00fd legacy maj\u00e1k, kter\u00fd funguje od 50. let a vys\u00edl\u00e1 sign\u00e1ly v b\u011b\u017en\u00e9 AM modulaci Morseovou abecedou. Pravd\u011bpodobn\u011b si d\u00e1vno navig\u00e1tor opravdu tyto sign\u00e1ly poslechl v sluch\u00e1tk\u00e1ch a zaznamenal sm\u011bry prav\u00edtkem a kru\u017e\u00edtkem na map\u011b. Chceme sign\u00e1lu p\u0159idat nov\u00e9 funkce, ale tak, aby \"neporu\u0161ily\" kompatibilitu se star\u00fdmi. T\u00e9ma je zn\u00e1m\u00e9, nic nen\u00ed nov\u00e9... Bylo to ud\u011bl\u00e1no n\u00e1sleduj\u00edc\u00edm zp\u016fsobem \u2014 k AM sign\u00e1lu byl p\u0159id\u00e1n n\u00edzkofrekven\u010dn\u00ed t\u00f3n 30 Hz, kter\u00fd pln\u00ed funkci reference-f\u00e1ze sign\u00e1lu, a vysokofrekven\u010dn\u00ed slo\u017eka, zak\u00f3dovan\u00e1 frekven\u010dn\u00ed modulac\u00ed na frekvenci 9,96 kHz, p\u0159en\u00e1\u0161ej\u00edc\u00ed prom\u011bnlivou f\u00e1zi sign\u00e1lu. Odd\u011blen\u00edm dvou sign\u00e1l\u016f a porovn\u00e1n\u00edm f\u00e1z\u00ed z\u00edsk\u00e1v\u00e1me po\u017eadovan\u00fd \u00fahel od 0 do 360 stup\u0148\u016f, kter\u00fd je po\u017eadovan\u00fdm azimutem. P\u0159itom, to v\u0161e nebr\u00e1n\u00ed poslouchat maj\u00e1k \"oby\u010dejn\u00fdm zp\u016fsobem\" a z\u016fst\u00e1v\u00e1 kompatibiln\u00ed se star\u00fdmi AM p\u0159ij\u00edma\u010di. <\/p>\n

P\u0159ejd\u011bme od teorie k praxi. Spus\u0165me SDR p\u0159ij\u00edma\u010d, vyberme modulaci AM a \u0161\u00ed\u0159ku p\u00e1sma 12 kHz. Frekvence maj\u00e1k\u016f VOR lze snadno nal\u00e9zt na internetu. Na spektru sign\u00e1l vypad\u00e1 n\u00e1sledovn\u011b:<\/p>\n

\"Ur\u010dujeme
\n
\nV tomto p\u0159\u00edpad\u011b je sign\u00e1l maj\u00e1ku p\u0159en\u00e1\u0161en na frekvenci 113,950 MHz. Uprost\u0159ed je snadno rozpoznateln\u00e1 \u010d\u00e1ra amplitudov\u00e9 modulace a sign\u00e1ly Morseovou abecedou (.- \u2014 \u2026 co\u017e znamen\u00e1 AMS, Amsterdam, leti\u0161t\u011b Schiphol). Kolem na vzd\u00e1lenosti 9,6 kHz od nosn\u00e9 jsou vid\u011bt dva vrcholy, kter\u00e9 p\u0159en\u00e1\u0161ej\u00ed druh\u00fd sign\u00e1l. <\/p>\n

Zap\u00ed\u0161eme sign\u00e1l do WAV (ne MP3 \u2014 ztr\u00e1ta p\u0159i kompresi \u201ezabije\u201c celou strukturu sign\u00e1lu) a otev\u0159eme ho v GNU Radio.<\/p>\n

Dek\u00f3dov\u00e1n\u00ed<\/h2>\n

\nKrok 1<\/b>. Otev\u0159eme soubor se zaznamenan\u00fdm sign\u00e1lem a aplikujeme na n\u011bj doln\u00ed propust, abychom z\u00edskali prvn\u00ed referen\u010dn\u00ed sign\u00e1l. Graf GNU Radio je zobrazen na obr\u00e1zku.<\/p>\n

\"Ur\u010dujeme
\n
\nV\u00fdsledek: n\u00edzkofrekven\u010dn\u00ed sign\u00e1l o frekvenci 30 Hz.<\/p>\n

\"Ur\u010dujeme
\n
\nKrok 2<\/b>: dek\u00f3dujeme sign\u00e1l s prom\u011bnnou f\u00e1z\u00ed. Jak ji\u017e bylo zm\u00edn\u011bno, nach\u00e1z\u00ed se na frekvenci 9,96 kHz, mus\u00edme ho posunout na nulovou frekvenci a poslat na FM-demodul\u00e1tor.<\/p>\n

Graf GNU Radio:<\/p>\n

\"Ur\u010dujeme
\n
\nV\u0161echno, \u00faloha je vy\u0159e\u0161ena. Vid\u00edme dva sign\u00e1ly, jejich\u017e rozd\u00edl f\u00e1z\u00ed ukazuje na \u00fahel od p\u0159ij\u00edma\u010de k VOR maj\u00e1ku:<\/p>\n

\"Ur\u010dujeme
\n
\nSign\u00e1l je dost \u0161umov\u00fd a pro kone\u010dn\u00e9 v\u00fdpo\u010dty rozd\u00edlu f\u00e1z\u00ed m\u016f\u017ee b\u00fdt pot\u0159eba dal\u0161\u00ed filtrov\u00e1n\u00ed, ale princip douf\u00e1m, \u017ee je jasn\u00fd. Pro ty, kte\u0159\u00ed zapomn\u011bli, jak se ur\u010duje rozd\u00edl f\u00e1z\u00ed, obr\u00e1zek z aviation.stackexchange.com<\/a><\/noindex>:<\/p>\n

\"Ur\u010dujeme
\n
\nNa\u0161t\u011bst\u00ed to v\u0161echno nen\u00ed nutn\u00e9 d\u011blat ru\u010dn\u011b: ji\u017e existuje hotov\u00fd projekt<\/a><\/noindex> v Pythonu, kter\u00fd dek\u00f3duje VOR sign\u00e1ly z WAV soubor\u016f. Vlastn\u011b, jeho studium m\u011b inspirovalo k prozkoum\u00e1n\u00ed tohoto t\u00e9matu.<\/p>\n

Ti, kte\u0159\u00ed maj\u00ed z\u00e1jem, mohou spustit program v konzoli a z\u00edskat hotov\u00fd \u00fahel ve stupn\u00edch z ji\u017e zaznamenan\u00e9ho souboru:<\/p>\n

\"Ur\u010dujeme
\n
\nFanou\u0161ci letectv\u00ed si mohou dokonce vytvo\u0159it p\u0159enosn\u00fd p\u0159ij\u00edma\u010d pomoc\u00ed RTL-SDR a Raspberry Pi. Mimochodem, na \u201eskute\u010dn\u00e9m\u201c letadle vypad\u00e1 tento ukazatel p\u0159ibli\u017en\u011b takto:<\/p>\n

\"Ur\u010dujeme
\nObr\u00e1zek © www.aopa.org<\/a><\/noindex><\/p>\n

Z\u00e1v\u011br<\/h2>\n

\nTakov\u00e9 sign\u00e1ly \u201ez minul\u00e9ho stolet\u00ed\u201c jsou jist\u011b zaj\u00edmav\u00e9 pro anal\u00fdzu. Za prv\u00e9, jsou dost jednoduch\u00e9, modern\u00ed DRM nebo t\u00edm sp\u00ed\u0161e GSM ji\u017e takto \u201ena prstech\u201c dek\u00f3dovat nep\u016fjde. Jsou otev\u0159en\u00e9 pro p\u0159\u00edjem, neobsahuj\u00ed \u017e\u00e1dn\u00e9 kl\u00ed\u010de a kryptografii. Za druh\u00e9, je mo\u017en\u00e9, \u017ee v budoucnu zmiz\u00ed do historie a budou nahrazeny satelitn\u00ed navigac\u00ed a modern\u011bj\u0161\u00edmi digit\u00e1ln\u00edmi syst\u00e9my. Za t\u0159et\u00ed, studium takov\u00fdch standard\u016f umo\u017e\u0148uje zjistit zaj\u00edmav\u00e9 technick\u00e9 a historick\u00e9 podrobnosti o tom, jak byly \u00fakoly \u0159e\u0161eny na jin\u00fdch sch\u00e9matech a element\u00e1rn\u00ed z\u00e1kladn\u011b minul\u00e9ho stolet\u00ed. Tak\u017ee majitel\u016fm p\u0159ij\u00edma\u010d\u016f lze doporu\u010dit, aby p\u0159ij\u00edmali takov\u00e9 sign\u00e1ly, dokud je\u0161t\u011b funguj\u00ed.<\/p>\n

Jak obvykle, v\u0161em \u00fasp\u011b\u0161n\u00e9 experimenty.
\n
Zdroj: habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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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