{"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\/et\/blog\/administrirovanie\/zapis-sverh-shirokopolosnyh-signalov-standarta-802-15-4-uwb-na-pochti-sanktsionnoj-tehnike","title":{"rendered":"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><img decoding=\"async\" alt=\"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes\" src=\"\/wp-content\/uploads\/2019\/12\/68562b5e0b1849cba03dac91ba8e763f.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Hiljuti kohtusid meie laboris kaks t\u00e4iesti erinevat maailma: odavate raadio-transiivrite maailm ja v\u00e4ga kallite laiaulatuslike raadio-signaalide salvestuss\u00fcsteemide maailm. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<p>Esialgu p\u00f6\u00f6rdusid meie head s\u00f5brad meie poole, et luua tarkvara 500 MHz laiuskaista signaali salvestamiseks. Me ei saanud muidugi \u00e4ra \u00f6elda, kuna see pidi olema tehtud ettev\u00f5tte &#171;Instrumentaalsete S\u00fcsteemide&#187; plaadil, millega olen juba ammu tuttav. Oma insenerikarj\u00e4\u00e4ri alguses pidin t\u00f6\u00f6tama nende raua ja tarkvaraga.<\/p>\n<p><\/p>\n<p>Siis tuli kallis s\u00f5ber <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/users\/mikkab\/\" class=\"user_link\">mikkab<\/a><\/noindex> API-s <noindex><a rel=\"nofollow\" href=\"https:\/\/droneswarm.ru\/\">Droonide n\u00e4itus<\/a><\/noindex> ja palus luua GPS-ta dronide positsioneerimiss\u00fcsteem. \u00dctleb, et peame ette valmistama n\u00e4ituse siseruumides. Ja t\u00e4nap\u00e4eval ei taha ju v\u00e4ljas taevasse lasta mitu miljonit raha ebaturvalise GPS-i peale. Signaalih\u00e4ired ja satelliitnavigatsiooni h\u00e4kkimine <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/337608\/\">\u00f5itsevad<\/a><\/noindex>.<\/p>\n<p><\/p>\n<p>Ilma satelliitideta ja parem kui k\u00fcmne sentimeetri t\u00e4psuse saavutamiseks kuni kilomeetrise ulatuses ei leidnud ma midagi muud kui UWB tehnoloogiat. Turu peal on juba ammu ettev\u00f5te DecaWave, mis toodab DW1000 mikroskeeme ja mooduleid selle alusel. Mikroskeem on IEEE 802.15.4-2011 standardi j\u00e4rgi SHP-transiivrer. Muide, see on ainulaadne asjaolu, millel on topelt v\u00f5i isegi kolmikp\u00f5hi. Loodan, et suudame selle s\u00fcgavustes j\u00e4rgmise paar aasta jooksul orienteeruda ja sellest kirjutada. Varem ei olnud aega.<\/p>\n<p><\/p>\n<p>Kuid t\u00e4nane teema ei ole positsioneerimine, sellest r\u00e4\u00e4gime j\u00e4rgmistes osades.<\/p>\n<p><\/p>\n<p>T\u00e4na salvestame DW1000 signaali. Ja selle signaali laiuskaista on m\u00e4\u00e4ratu, 1000 v\u00f5i 500 MHz, mis m\u00e4\u00e4ratakse kanalite numbri kaudu. &#171;Juhuslikult&#187; seisis naabrilaudadel arvuti, millel oli plaat <noindex><a rel=\"nofollow\" href=\"http:\/\/insys.ru\/fmc\/fmc126p\">FMC126P<\/a><\/noindex> et &#171;Instrumentaalsetelt S\u00fcsteemidelt&#187; FMC-mezzaniiniga. <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> ettev\u00f5ttelt Analog Devices.<\/p>\n<p><\/p>\n<p>Siinkohal tasub m\u00e4rkida &#171;prokur\u00f6rile&#187;, et AD9208 ADC on t\u00e4na sanktsioonide alla kuuluv tehnika. Selle seadme seaduslik ostmine Venemisse ei ole v\u00f5imalik, isegi kui aeg-ajalt on v\u00e4ga soovitav. Kuid see konkreetne moodul osteti juba ammu, kui sanktsioone veel ei olnud. Ta on puhas nagu beebi hing. Loodan, et see tunnistus liidetakse juhtumiga ja arvesse v\u00f5etakse kostja kasuks.<\/p>\n<p><\/p>\n<p>\u00c4rme praegu s\u00fcveneda tarkvara arendamise detailidesse, mis salvestab voogude n\u00e4idud arvuti m\u00e4lu. Kahjuks ei saa me praegu avalikustada Linuxi rakenduse l\u00e4htekoodi. Kuid loodame j\u00e4rgmise korraga sellele loa saada. Tuleb lihtsalt m\u00e4rkida, et see ei olnud lihtne, isegi arvestades Instrumentaalsete S\u00fcsteemide pakutud tarkvaralahendusi. ADC ja tema ajastus- ja v\u00e4ljundis\u00fcsteem JESD204B tehnoloogia j\u00e4rgi on \u00fcsna keerulised m\u00f5istmiseks ning AD moodulis osutusid vajalikuks riistvarapat\u0161id. REFCLK signaal on sisend s\u00fcsteemis kindlasti vajalik, aga moodulis ei l\u00e4he see \u00f5igetele FM\u0421 pistiku jalgadele ning seet\u00f5ttu ei j\u00f5ua see vajalikesse FPGA jalgadesse. Pidi rakendama pat\u0161i, mida saab n\u00e4ha alloleval fotol \u2014 kaks punast juhet. Loomulikult oli kahtlusi, et see toimib. Kellafrekvents on k\u00f5rge \u2014 375 MHz ja pat\u0161 on kohutav. Kuid s\u00fcsteem suudab sellega hakkama saada.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes\" src=\"\/wp-content\/uploads\/2019\/12\/1d4d728d3c8b3b69c91d3b21b1d5c60c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Kogu k\u00f6\u00f6k n\u00e4eb v\u00e4lja niimoodi.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes\" src=\"\/wp-content\/uploads\/2019\/12\/4dc96f0194c69b3c9bd1fa9adfefd002.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Siit v\u00f5ib m\u00e4rgata head sisend-v\u00e4ljund s\u00fcsteemiga arvutit, FMC126P plaati, mehhanismi AD9208-3000EBZ. Generaatoreid: 3000 MHz generaator ADC ajastamiseks, 770 MHz generaator REFCLK jaoks. SMA pistikutega kaablid \u00fchendavad generaatorid ja edastavad sisendisignaali.<\/p>\n<p><\/p>\n<p>ADC v\u00e4ljundi toores andmeedastuskiirus, kui ei ole liialdada, on 12 GB\/s kahe kanali pealt. FMC126P plaadi tootja m\u00f5\u00f5tmiste ja deklareerimise kohaselt on maksimaalne sisestamise kiirus 5 GB\/s. Seet\u00f5ttu kasutasime ADC-s ainult \u00fchte kanali ja edastasime selle AD9208 sisseehitatud DDC (Digital Down Converter) kaudu neljakordse dekimaadiga. Seega andmevoog oli 3 GB\/s (diskreetimisfrekvents 750 MHz, 16-bitine kompleks signaal).<\/p>\n<p><\/p>\n<p>S\u00fcsteemi v\u00f5ime n\u00e4itude salvestamist kontrollida on v\u00e4ga lihtne: tuleb lihtsalt j\u00e4lgida, kas FIFO FPGA staatuse bitid ei kleepu. Kui \u00f6\u00f6 jooksul ei olnud FIFO Overflow s\u00fcndmust, ei t\u00f5use see bit. Ja me r\u00f5\u00f5muga tuvastame, et kaotusi ei olnud. Eelnevalt kontrollime loomulikult, kas staatuse bitide fikseerimine t\u00f6\u00f6tab. Samuti vaatame signaali kuju failist, et veenduda, et ADC signaali kvaliteet vastab dokumentatsioonile.<\/p>\n<p><\/p>\n<p>Aga milline signaal v\u00e4\u00e4rib sellist sisend s\u00fcsteemi? Muidugi UWB naabri laual!<\/p>\n<p><\/p>\n<p>\u00d5nneks valisime dronide positsioneerimise s\u00fcsteemile 4 GHz-kanali sageduse. See vastab DW1000 terminoloogias kanalitele 4 ja 2 (kuvatakse joonisel 13 andmelehes). Me tegime sellele sagedusele integreeritud antenni, v\u00f5i \u00f5igemini, sellele sagedusvahemikule. Selle laiuse jooksul oli see \u00fchilduvuse tagamine keeruline. Aga tulemus j\u00e4i igati nauditav! M\u00f5ned \u00fctlevad, et see meenutab s\u00fcmbolit... k\u00f5rvadega.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes\" src=\"\/wp-content\/uploads\/2019\/12\/b553369fa20552e7fc852d63b325664e.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>4 GHz signaal, mille ribalaius on 500 MHz, satub Nyquist'i kolmandasse vahemikku ja omab piisavaid kaitseintervalle spektri kattumise v\u00e4ltimiseks. Seet\u00f5ttu suunasime DW1000 signaali otse AD9208 ADC sisendisse.<\/p>\n<p><\/p>\n<p>Saime kaks fail: \u00fcks PRF sagedusega 64 MHz, teine - 16 MHz. Andmeedastuskiirus oli DW1000 jaoks minimaalne - 110 kbit\/s.<\/p>\n<p><\/p>\n<p>See on <noindex><a rel=\"nofollow\" href=\"https:\/\/drive.google.com\/open?id=1sEgkDhkqKLpKFxTKilRB2po3ZPBkTOor\">esimene<\/a><\/noindex> fail, see on <noindex><a rel=\"nofollow\" href=\"https:\/\/drive.google.com\/open?id=1jsSVK_rPT0IuVGuV3gmdCvPWgMnKceZ2\">teises<\/a><\/noindex>. Olge ettevaatlikud, failid on tohutud!<\/p>\n<p><\/p>\n<p>Esimeses failis n\u00e4eme pakette, mille kestus on umbes 750 n\u00e4idist v\u00f5i 1000 nanosekundit.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes\" src=\"\/wp-content\/uploads\/2019\/12\/b2d583d9e45d75bde63e44b43a0e3970.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Teises failis on paketid neli korda l\u00fchemad.<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes\" src=\"\/wp-content\/uploads\/2019\/12\/12e85d2b8d68e2398b637aaa9ebfb84c.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Ja see vastab IEEE 802.15.4-2011 standardile UWB f\u00fc\u00fcsilise tasandi osas:<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes\" src=\"\/wp-content\/uploads\/2019\/12\/671d8002c7cadeea61f2bb32964fcb51.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>Paketi siserakendus sarnaneb faasmodulatsiooniga, mis vastab ka standardses BPSK-is m\u00e4\u00e4ratletule. Ise standardi leiate Internetist, otsige &#171;IEEE 802.15.4-2011&#187;.<\/p>\n<p><\/p>\n<p>Kui pisut laiendada vaatamisakent, siis on n\u00e4ha pakettide mittes\u00fcmpaatset j\u00e4rjestust, mis vastab h\u00fcbriidmodulatsiooni kirjeldusele IEEE 802.15.4-2011 UWB - positsioon-faas (BPM-BPSK).<\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes\" src=\"\/wp-content\/uploads\/2019\/12\/d9be4fac08b080efb714a4df071ea786.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p><img decoding=\"async\" alt=\"802.15.4 UWB \u00fcle-laia ribaga signaalide salvestamine praktiliselt sanktsioonide alusel valmistatud seadmetes\" src=\"\/wp-content\/uploads\/2019\/12\/2e3a5dbb4902a52acd305100f52a9ac1.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/p>\n<p><\/p>\n<p>\u00dcldiselt pean DW1000 kiipi ja selle UWB PHY modulaatsiooni uskumatuks, mis iganes see ka ei t\u00e4hendaks, tasemel s\u00f5jaline JTIDS. See on minu uus hobi. J\u00e4tkub!<\/p>\n<p><\/p>\n<p>\u00dchest k\u00fcljest kaevame DW1000, teisest k\u00fcljest uurime IEEE 802.15.4 standardit.<\/p>\n<p>Allikas: <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 5.0.1.1 - 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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