{"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\/ro\/blog\/administrirovanie\/zapis-sverh-shirokopolosnyh-signalov-standarta-802-15-4-uwb-na-pochti-sanktsionnoj-tehnike","title":{"rendered":"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.\" src=\"\/wp-content\/uploads\/2019\/12\/68562b5e0b1849cba03dac91ba8e763f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Recentemente, dou\u0103 lumi complet diferite s-au \u00eent\u00e2lnit \u00een laboratorul nostru: lumea transceiverelor radio ieftine \u0219i lumea sistemelor scumpe de \u00eenregistrare a semnalelor radio cu l\u0103\u021bime de band\u0103 larg\u0103. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>La \u00eenceput, prietenii no\u0219tri buni s-au adresat la noi pentru a realiza un software pentru \u00eenregistrarea semnalului pe o band\u0103 de 500 MHz. Bine\u00een\u021beles c\u0103 nu am putut refuza. Trebuia s\u0103 facem asta pe placa companiei &#171;Instrumental Systems&#187;, cu care sunt familiarizat de mult timp. La \u00eenceputul carierei mele \u00een inginerie, a trebuit s\u0103 lucrez cu hardware-ul \u0219i software-ul lor.<\/p>\n<p><\/p>\n<p>Apoi, un drag prieten a venit <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/mikkab\/\" class=\"user_link\">mikkab<\/a><\/noindex> din <noindex><a rel=\"nofollow\" href=\"https:\/\/droneswarm.ru\/\">Spectacolul Dronelor<\/a><\/noindex> \u0219i a cerut s\u0103 cre\u0103m un sistem de pozi\u021bionare pentru drone f\u0103r\u0103 GPS. Trebuie, zice, s\u0103 lans\u0103m un spectacol \u00een interior. \u0218i afar\u0103, \u00een vremurile noastre, nu vrei s\u0103 arunci \u00een aer c\u00e2teva milioane pe un GPS nesigur. Interferen\u021bele \u0219i spoofing-ul sistemelor de naviga\u021bie prin satelit <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/337608\/\">proliferaz\u0103<\/a><\/noindex>.<\/p>\n<p><\/p>\n<p>Pentru pozi\u021bionarea f\u0103r\u0103 sateli\u021bi cu o precizie mai bun\u0103 de zece centimetri \u00eentr-o zon\u0103 de p\u00e2n\u0103 la un kilometru, nu am g\u0103sit nimic altceva, \u00een afar\u0103 de tehnologia UWB. De mult timp pe pia\u021b\u0103 exist\u0103 compania DecaWave, care produce cipul DW1000 \u0219i module pe baza lui. Cipul este un transceiver UWB conform standardului IEEE 802.15.4-2011. Apropo, este o chestie unic\u0103, cu un fund dublu sau chiar triplu. Sper c\u0103 vom putea explora ad\u00e2ncurile sale \u00een urm\u0103torii c\u00e2\u021biva ani \u0219i scriem despre asta. P\u00e2n\u0103 atunci nu vom reu\u0219i.<\/p>\n<p><\/p>\n<p>Dar ast\u0103zi nu vorbim despre pozi\u021bionare, despre asta \u00een episoadele urm\u0103toare.<\/p>\n<p><\/p>\n<p>Ast\u0103zi, realiz\u0103m \u00eenregistrarea semnalului DW1000. Iar banda acestui semnal nu este mai mult \u0219i nu mai pu\u021bin de 1000 sau 500 MHz, \u00een func\u021bie de num\u0103rul canalului. &#171;Dintr-o coinciden\u021b\u0103&#187;, pe masa al\u0103turat\u0103 se afla un computer cu o plac\u0103 <noindex><a rel=\"nofollow\" href=\"http:\/\/insys.ru\/fmc\/fmc126p\">FMC126P<\/a><\/noindex> de la &#171;Instrumental Systems&#187; cu un mezzanin FMC. <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> de la Analog Devices.<\/p>\n<p><\/p>\n<p>Aici merit\u0103 men\u021bionat &#171;pentru procuror&#187;, c\u0103 ADC AD9208 este ast\u0103zi o tehnologie supus\u0103 sanc\u021biunilor. Nu se poate cump\u0103ra legal \u00een Rusia, chiar dac\u0103 uneori foarte ai vrea. Dar acest modul specific a fost achizi\u021bionat cu mult timp \u00een urm\u0103, c\u00e2nd nu existau sanc\u021biuni. Este curat, ca sufletul unui copil. Sper c\u0103 aceast\u0103 m\u0103rturie va fi anexat\u0103 la dosar \u0219i va conta pentru inculpat.<\/p>\n<p><\/p>\n<p>S\u0103 nu ne aventur\u0103m acum \u00een detalii despre dezvoltarea software-ului pentru \u00eenregistrarea fluxului de date \u00een memoria computerului. Din p\u0103cate, nu putem publica acum codul surs\u0103 al aplica\u021biei pentru Linux. Dar sper\u0103m s\u0103 ob\u021binem permisiunea pentru asta data viitoare. Este important de men\u021bionat c\u0103 a fost dificil, chiar \u0219i av\u00e2nd \u00een vedere materialele software furnizate de Instrumental Systems. \u00censu\u0219i ADC-ul \u0219i sistemul s\u0103u de temporizare \u0219i de ie\u0219ire a datelor folosind tehnologia JESD204B sunt destul de complexe, iar modulul de la AD a necesitat \u0219i patch-uri hardware. Semnalul REFCLK este absolut necesar pentru sistemul de intrare, dar acesta nu se leag\u0103 la pinii corec\u021bi ai conectorului FMC \u0219i, prin urmare, nu ajunge la pinii necesari ai FPGA-ului. A fost necesar s\u0103 aplic\u0103m un patch, pe care \u00eel pute\u021bi vedea \u00een fotografia de mai jos \u2014 cele dou\u0103 fire ro\u0219ii. Desigur, au fost \u00eendoieli c\u0103 acest lucru va func\u021biona. Frecven\u021ba semnalului de ceas este ridicat\u0103 \u2014 375 MHz, iar patch-ul este \u00eengrozitor. Dar sistemul s-a descurcat.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.\" src=\"\/wp-content\/uploads\/2019\/12\/1d4d728d3c8b3b69c91d3b21b1d5c60c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>\u00centreaga buc\u0103t\u0103rie arat\u0103 astfel.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.\" src=\"\/wp-content\/uploads\/2019\/12\/4dc96f0194c69b3c9bd1fa9adfefd002.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Aici se poate observa un computer cu un sistem bun de intrare\/ie\u0219ire, placa FMC126P, mezzanina AD9208-3000EBZ. Din generatoare: un generator de 3000 MHz pentru temporizarea ADC-ului, un generator de 770 MHz pentru REFCLK. Cablurile cu conectori SMA conecteaz\u0103 generatoarele \u0219i furnizeaz\u0103 semnalul de intrare.<\/p>\n<p><\/p>\n<p>Viteza brut\u0103 a datelor de la ie\u0219irea ADC-ului, f\u0103r\u0103 a exagera, este de 12 GB\/s din dou\u0103 canale. Potrivit m\u0103sur\u0103torilor \u0219i declara\u021biei produc\u0103torului pl\u0103cii FMC126P, viteza maxim\u0103 de intrare este de 5 GB\/s. De aceea, am folosit doar un canal \u00een ADC \u0219i l-am trecut prin DDC-ul \u00eencorporat \u00een AD9208 (Digital Down Converter) cu decimare de patru. Astfel, fluxul de date a fost de 3 GB\/s (frecven\u021ba de e\u0219antionare 750 MHz, semnal complex de 16 bi\u021bi).<\/p>\n<p><\/p>\n<p>Verificarea faptului c\u0103 sistemul reu\u0219e\u0219te s\u0103 \u00eenregistreze datele este foarte simpl\u0103: trebuie doar s\u0103 monitoriz\u0103m bi\u021bii de stare FIFO ai FPGA-ului. Dac\u0103 pe parcursul nop\u021bii nu a existat niciun eveniment FIFO Overflow, atunci bitul nu va fi ridicat. \u0218i constat\u0103m cu bucurie c\u0103 nu au existat pierderi de date. \u00cen prealabil, desigur, verific\u0103m c\u0103 fixarea bi\u021bilor de stare func\u021bioneaz\u0103. De asemenea, analiz\u0103m forma semnalului din fi\u0219ier pentru a ne asigura c\u0103 calitatea prelu\u0103rii semnalului ADC corespunde documenta\u021biei.<\/p>\n<p><\/p>\n<p>Dar ce semnal va fi demn de un astfel de sistem de intrare? Desigur, UWB de pe masa de al\u0103turi!<\/p>\n<p><\/p>\n<p>Din fericire, pentru sistemul de pozi\u021bionare a dronelor am ales frecven\u021ba canalului de 4 GHz. Aceasta corespunde canalelor 4 \u0219i 2 \u00een terminologia DW1000 (Figura 13 din fi\u0219a tehnic\u0103). Am realizat o anten\u0103 integrat\u0103 pe aceast\u0103 frecven\u021b\u0103, sau, mai bine zis, pe acest interval. A fost dificil s\u0103 o reglez \u00eentr-un astfel de spectru larg. Dar rezultatul este atr\u0103g\u0103tor! Unii spun c\u0103 seam\u0103n\u0103 cu un simbol\u2026 cu urechi.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.\" src=\"\/wp-content\/uploads\/2019\/12\/b553369fa20552e7fc852d63b325664e.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Semnalul de 4 GHz cu o l\u0103\u021bime de band\u0103 de 500 MHz intr\u0103 \u00een a treia band\u0103 Nyquist \u0219i are intervale de protec\u021bie suficiente pentru a evita suprapunerile spectrale. Prin urmare, am conectat pur \u0219i simplu semnalul DW1000 direct la intrarea ADC AD9208.<\/p>\n<p><\/p>\n<p>Am ob\u021binut dou\u0103 fi\u0219iere: unul cu o frecven\u021b\u0103 PRF de 64 MHz, iar cel\u0103lalt \u2014 16 MHz. Rata de transfer a fost setat\u0103 la minimul pentru DW1000 \u2014 110 kbit\/s.<\/p>\n<p><\/p>\n<p>Aceasta <noindex><a rel=\"nofollow\" href=\"https:\/\/drive.google.com\/open?id=1sEgkDhkqKLpKFxTKilRB2po3ZPBkTOor\">primul<\/a><\/noindex> fi\u0219ier, este <noindex><a rel=\"nofollow\" href=\"https:\/\/drive.google.com\/open?id=1jsSVK_rPT0IuVGuV3gmdCvPWgMnKceZ2\">al doilea<\/a><\/noindex>. Ciudat, fi\u0219ierele sunt enorme!<\/p>\n<p><\/p>\n<p>\u00cen primul fi\u0219ier vedem pachete cu o durat\u0103 de aproximativ 750 de e\u0219antioane sau 1000 de nanosecunde.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.\" src=\"\/wp-content\/uploads\/2019\/12\/b2d583d9e45d75bde63e44b43a0e3970.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>\u00cen al doilea fi\u0219ier, pachetele sunt de patru ori mai scurte.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.\" src=\"\/wp-content\/uploads\/2019\/12\/12e85d2b8d68e2398b637aaa9ebfb84c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>\u0218i acest lucru corespunde \u00een \u00eentregime standardului IEEE 802.15.4-2011 \u00een ceea ce prive\u0219te nivelul fizic UWB:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.\" src=\"\/wp-content\/uploads\/2019\/12\/671d8002c7cadeea61f2bb32964fcb51.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Modula\u021bia din interiorul pachetului este similar\u0103 cu cea de faz\u0103, ceea ce corespunde specifica\u021biei BPSK men\u021bionate. Standardul propriu-zis \u00eel ve\u021bi putea g\u0103si pe Internet, c\u0103uta\u021bi &#171;IEEE 802.15.4-2011&#187;.<\/p>\n<p><\/p>\n<p>Dac\u0103 extindem pu\u021bin fereastra temporar\u0103 de observa\u021bie, se pot observa \u0219i neregularit\u0103\u021bile \u00een secven\u021ba pachetelor, ceea ce corespunde descrierii modula\u021biei hibride IEEE 802.15.4-2011 UWB \u2014 modula\u021bia de pozi\u021bie \u0219i faz\u0103 (BPM-BPSK).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.\" src=\"\/wp-content\/uploads\/2019\/12\/d9be4fac08b080efb714a4df071ea786.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"\u00cenregistrarea semnalelor ultra-larg de band\u0103 din standardul 802.15.4 UWB pe echipamente aproape sanc\u021bionate.\" src=\"\/wp-content\/uploads\/2019\/12\/2e3a5dbb4902a52acd305100f52a9ac1.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>\u00cen general, consider c\u0103 cipul DW1000 \u0219i modula\u021bia acestui UWB PHY sunt incredibile, indiferent ce ar \u00eensemna asta, la nivel militar JTIDS. Este noua mea pasiune. Continuarea urmeaz\u0103!<\/p>\n<p><\/p>\n<p>Pe de o parte, ne vom aprofunda \u00een DW1000, pe de alt\u0103 parte, ne vom ocupa de standardul IEEE 802.15.4.<\/p>\n<p>Sursa: <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 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\u0441\u0434\u0435\u043b\u0430\u0442\u044c \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 5.0.2.1 - aioseo.com -->\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" 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