{"id":53485,"date":"2019-12-03T00:00:00","date_gmt":"2019-12-02T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/zapis-sverh-shirokopolosnyh-signalov-standarta-802-15-4-uwb-na-pochti-sanktsionnoj-tehnike"},"modified":"2020-02-18T14:01:23","modified_gmt":"2020-02-18T11:01:23","slug":"zapis-sverh-shirokopolosnyh-signalov-standarta-802-15-4-uwb-na-pochti-sanktsionnoj-tehnike","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/administrirovanie\/zapis-sverh-shirokopolosnyh-signalov-standarta-802-15-4-uwb-na-pochti-sanktsionnoj-tehnike","title":{"rendered":"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi\" src=\"\/wp-content\/uploads\/2019\/12\/68562b5e0b1849cba03dac91ba8e763f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Nedavno su se u na\u0161oj laboratoriji spojila dva potpuno razli\u010dita svijeta: svijet povoljnih radio-transivera i svijet skupljih sustava za snimanje \u0161irokopojasnih radio-signala. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Na po\u010detku su nam se obratili na\u0161i dragi prijatelji tra\u017ee\u0107i softver za snimanje signala \u0161irine 500 MHz. Naravno, nismo mogli odbiti. Trebalo je to napraviti na plo\u010di kompanije &#171;Instrumentske Sisteme&#187;, koju poznajem ve\u0107 dugo. Na po\u010detku svoje in\u017eenjerske karijere morao sam raditi s njihovim hardverom i softverom.<\/p>\n<p><\/p>\n<p>A onda je do\u0161ao dragi prijatelj <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/mikkab\/\" class=\"user_link\">mikkab<\/a><\/noindex> iz <noindex><a rel=\"nofollow\" href=\"https:\/\/droneswarm.ru\/\">Show Dronova<\/a><\/noindex> i zatra\u017eio izradu sustava za pozicioniranje dronova bez GPS-a. Mora se, ka\u017ee, prirediti show u zatvorenim prostorima. I vani, u na\u0161e vrijeme, nije ba\u0161 po\u017eeljno slati nekoliko milijuna u zrak na nepouzdanom GPS-u. Smetnje i spoofing satelitske navigacije <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/337608\/\">su sveprisutni.<\/a><\/noindex>.<\/p>\n<p><\/p>\n<p>Za pozicioniranje bez satelita s to\u010dno\u0161\u0107u boljom od deset centimetara u podru\u010dju do jednog kilometra, nisam na\u0161ao ni\u0161ta osim UWB tehnologije. Ve\u0107 dugo na tr\u017ei\u0161tu postoji tvrtka DecaWave koja proizvodi \u010dip DW1000 i module na njegovoj bazi. \u010cip je UWB-transiver standarda IEEE 802.15.4-2011. Usput, stvar je jedinstvena, s dvostrukim ili \u010dak trostrukim dnom. Nadam se da \u0107emo mo\u0107i zaroniti u njezine dubine u narednih nekoliko godina i pisati o tome. Ranije ne\u0107emo sti\u0107i.<\/p>\n<p><\/p>\n<p>Ali danas nije rije\u010d o pozicioniranju, o tome u sljede\u0107im epizodama.<\/p>\n<p><\/p>\n<p>Danas snimamo DW1000 signal. A \u0161irina ovog signala, ni vi\u0161e ni manje, iznosi 1000 ili 500 MHz, \u0161to je odre\u0111eno brojem kanala. &#171;Slu\u010dajno&#187; je na susjednom stolu stajao ra\u010dunar s plo\u010dom <noindex><a rel=\"nofollow\" href=\"http:\/\/insys.ru\/fmc\/fmc126p\">FMC126P<\/a><\/noindex> od &#171;Instrumentskih Sistema&#187; s FMC-mezaninom. <noindex><a rel=\"nofollow\" href=\"https:\/\/www.analog.com\/ru\/design-center\/evaluation-hardware-and-software\/evaluation-boards-kits\/eval-ad9208.html\">AD9208-3000EBZ<\/a><\/noindex> od Analog Devices.<\/p>\n<p><\/p>\n<p>Ovdje treba napomenuti &#171;za tu\u017eioca&#187; da je ADC AD9208 danas sankcionirana tehnologija. Ne mo\u017ee se legalno kupiti u Rusiju, iako ponekad jako \u017eelimo. No, ovaj konkretan modul kupljen je jako davno, kada sankcija jo\u0161 nije bilo. \u010cist je kao du\u0161a novoro\u0111en\u010deta. Nadam se da \u0107e ovo priznavanje biti prilo\u017eeno spisu i uva\u017eeno od strane optu\u017eenog.<\/p>\n<p><\/p>\n<p>Ne\u0107emo se sada zanositi detaljima o razvoju softvera za zapisivanje protoka podataka u memoriju ra\u010dunala. Na\u017ealost, trenutno ne mo\u017eemo objaviti izvorni kod aplikacije za Linux. Me\u0111utim, nadamo se da \u0107emo dobiti dozvolu za to sljede\u0107i put. Treba napomenuti da nije bilo jednostavno, \u010dak i s obzirom na dostupne softverske radne materijale Instrumentalnih Sustava. Sam ADC i sustav njegovog taktiranja i izlaznih podataka po tehnologiji JESD204B su prili\u010dno slo\u017eeni za razumijevanje, a jo\u0161 je u modulu od AD bilo potrebno primijeniti hardverske zakrpe. Signal REFCLK sustavu ulaza je obavezan, a on ulazi u modul na pogre\u0161nim nogama konektora FMC i, shodno tome, ne dolazi na ispravne noge FPGA. Morali smo primijeniti zakrpu koju mo\u017eete vidjeti na fotografiji ispod \u2014 dva crvena kabla. Naravno, bilo je sumnji u to ho\u0107e li to raditi. Frekvencija taktnog signala je visoka \u2014 375 MHz, a zakrpa je stra\u0161na. No sustav se nosio.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi\" src=\"\/wp-content\/uploads\/2019\/12\/1d4d728d3c8b3b69c91d3b21b1d5c60c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Cijela kuhinja izgleda ovako.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi\" src=\"\/wp-content\/uploads\/2019\/12\/4dc96f0194c69b3c9bd1fa9adfefd002.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Ovdje mo\u017eemo primijetiti ra\u010dunalo s dobrom ulazno-izlaznom sustavom, plo\u010du FMC126P, mezanin AD9208-3000EBZ. Od generatora: generator od 3000 MHz za taktiranje ADC-a, generator od 770 MHz za REFCLK. Kablovi s SMA konektorima povezuju generatore i dovode ulazni signal.<\/p>\n<p><\/p>\n<p>Siroma\u0161na brzina podataka s izlaza ADC-a, ako ne ra\u010dunamo sitnice, iznosi 12 GB\/s s dva kanala. Prema mjerenjima i deklaraciji proizvo\u0111a\u010da plo\u010de FMC126P, maksimalna brzina ulaza iznosi 5 GB\/s. Stoga smo u ADC-u koristili samo jedan kanal i proveli ga kroz ugra\u0111eni DDC (Digital Down Converter) u AD9208 s dekadentacijom na \u010detiri. Na taj na\u010din, protok podataka iznosio je 3 GB\/s (frekvencija uzorkovanja 750 MHz, 16-bitni kompleksni signal).<\/p>\n<p><\/p>\n<p>Provjera da sustav uspijeva zabilje\u017eiti podatke vrlo je jednostavna: samo treba nadgledati blokirane bitove statusa FIFO FPGA. Ako tijekom no\u0107i nije bilo nijednog doga\u0111aja FIFO Overflow, bit se ne\u0107e aktivirati. I radosno konstatiramo da nije bilo gubitka podataka. Naravno, prethodno provjeravamo da li funkcija fiksacije bitova statusa radi. Tako\u0111er pregledavamo oblik signala iz datoteke kako bismo bili sigurni da kvaliteta snimanja signala ADC-a odgovara dokumentaciji.<\/p>\n<p><\/p>\n<p>Ali kakav signal bi bio dostojan takvog ulaznog sustava? Naravno, UWB s susjednog stola!<\/p>\n<p><\/p>\n<p>Na sre\u0107u, za sustav pozicioniranja dronova odabrali smo frekvenciju kanala od 4 GHz. To odgovara kanalima 4 i 2 u terminologiji DW1000 (Slika 13 datasheeta). Izradili smo ugra\u0111enu antenu na ovoj frekvenciji, ili bolje re\u010deno, na ovom opsegu. Usaglasiti ju je bio izazov unutar tako \u0161irokog spektra. Ali rezultat je bio izvanredan! Neki ka\u017eu da izgleda kao simbol... s u\u0161ima.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi\" src=\"\/wp-content\/uploads\/2019\/12\/b553369fa20552e7fc852d63b325664e.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Signal od 4 GHz s opsegom od 500 MHz pada u tre\u0107i pojas Nyquista i ima adekvatne za\u0161titne intervale kako bi izbjegao preklapanje spektra. Stoga smo jednostavno izravno poslali signal DW1000 na ulaz ADC-a AD9208.<\/p>\n<p><\/p>\n<p>Dobili smo dvije datoteke: jednu s frekvencijom PRF od 64 MHz, drugu \u2014 16 MHz. Brzina prijenosa bila je minimalna za DW1000 \u2014 110 kbps.<\/p>\n<p><\/p>\n<p>To <noindex><a rel=\"nofollow\" href=\"https:\/\/drive.google.com\/open?id=1sEgkDhkqKLpKFxTKilRB2po3ZPBkTOor\">prvi<\/a><\/noindex> datoteka, ovo <noindex><a rel=\"nofollow\" href=\"https:\/\/drive.google.com\/open?id=1jsSVK_rPT0IuVGuV3gmdCvPWgMnKceZ2\">drugi<\/a><\/noindex>. Pa\u017eljivo, datoteke su ogromne!<\/p>\n<p><\/p>\n<p>U prvoj datoteci vidimo pakete koji traju oko 750 uzoraka ili 1000 nanosekundi.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi\" src=\"\/wp-content\/uploads\/2019\/12\/b2d583d9e45d75bde63e44b43a0e3970.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>U drugoj datoteci paketi su \u010detiri puta kra\u0107i.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi\" src=\"\/wp-content\/uploads\/2019\/12\/12e85d2b8d68e2398b637aaa9ebfb84c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>I to se u potpunosti poklapa sa standardom IEEE 802.15.4-2011 u dijelu fizi\u010dke razine UWB:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi\" src=\"\/wp-content\/uploads\/2019\/12\/671d8002c7cadeea61f2bb32964fcb51.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Modulacija unutar paketa sli\u010dna je faznoj, \u0161to tako\u0111er odgovara onome \u0161to je navedeno u standardu BPSK. Sam standard mo\u017eete prona\u0107i na internetu, potra\u017eite &#171;IEEE 802.15.4-2011&#187;.<\/p>\n<p><\/p>\n<p>Ako malo pro\u0161irite vremensko okno promatranja, mo\u017eete primijetiti i neujedna\u010denosti u slijedu paketa, \u0161to odgovara opisu hibridne modulacije IEEE 802.15.4-2011 UWB \u2014 pozicijsko-faznoj (BPM-BPSK).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi\" src=\"\/wp-content\/uploads\/2019\/12\/d9be4fac08b080efb714a4df071ea786.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"Snimalica ultra \u0161irokopojasnih signala standarda 802.15.4 UWB na gotovo sankcioniranoj opremi\" src=\"\/wp-content\/uploads\/2019\/12\/2e3a5dbb4902a52acd305100f52a9ac1.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Uop\u0107e, smatram \u010dip DW1000 i modulaciju ovog UWB PHY nevjerojatnom, bez obzira na to \u0161to to zna\u010dilo, na razini vojnog JTIDS-a. Ovo je moja nova strast. Nastavlja se!<\/p>\n<p><\/p>\n<p>S jedne strane, prou\u010dit \u0107emo DW1000, s druge strane, istra\u017eit \u0107emo standard IEEE 802.15.4.<\/p>\n<p>Izvor: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/478140\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041d\u0435\u0434\u0430\u0432\u043d\u043e \u0434\u0432\u0430 \u0441\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u043d\u043e \u0440\u0430\u0437\u043d\u044b\u0445 \u043c\u0438\u0440\u0430 \u0441\u043e\u0448\u043b\u0438\u0441\u044c \u0432 \u043d\u0430\u0448\u0435\u0439 \u043b\u0430\u0431\u043e\u0440\u0430\u0442\u043e\u0440\u0438\u0438: \u043c\u0438\u0440 \u043d\u0435\u0434\u043e\u0440\u043e\u0433\u0438\u0445 \u0440\u0430\u0434\u0438\u043e-\u0442\u0440\u0430\u043d\u0441\u0438\u0432\u0435\u0440\u043e\u0432 \u0438 \u043c\u0438\u0440 \u0434\u043e\u0440\u043e\u0433\u0443\u0449\u0438\u0445 \u0441\u0438\u0441\u0442\u0435\u043c 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\u044d\u0442\u043e \u043d\u0430 \u043f\u043b\u0430\u0442\u0435 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 &#171;\u0418\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0435 \u0421\u0438\u0441\u0442\u0435\u043c\u044b&#187;, \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u044f \u0437\u043d\u0430\u044e \u0434\u0430\u0432\u043d\u043e. \u041d\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-53485","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link 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