{"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\/sq\/blog\/administrirovanie\/zapis-sverh-shirokopolosnyh-signalov-standarta-802-15-4-uwb-na-pochti-sanktsionnoj-tehnike","title":{"rendered":"Regjistrimi i sinjaleve super t\u00eb gjer\u00eb 802.15.4 UWB n\u00eb nj\u00eb teknik\u00eb gati sanksionuese","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\"Regjistrimi<\/p>\n

<\/p>\n

S\u00eb fundi, dy bot\u00eb krejt t\u00eb ndryshme u bashkuan n\u00eb laboratorin ton\u00eb: bota e transiver\u00ebve radio t\u00eb lir\u00eb dhe bota e sistemeve t\u00eb shtrenjta p\u00ebr regjistrimin e sinjaleve radio me band\u00eb t\u00eb gjer\u00eb. <\/p>\n

<\/a><\/noindex><\/p>\n

\u0421\u043d\u0430\u0447\u0430\u043b\u0430 \u043a \u043d\u0430\u043c \u043e\u0431\u0440\u0430\u0442\u0438\u043b\u0438\u0441\u044c \u043d\u0430\u0448\u0438 \u0445\u043e\u0440\u043e\u0448\u0438\u0435 \u0434\u0440\u0443\u0437\u044c\u044f, \u0447\u0442\u043e\u0431\u044b \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0441\u043e\u0444\u0442 \u0434\u043b\u044f \u0437\u0430\u043f\u0438\u0441\u0438 \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u043f\u043e\u043b\u043e\u0441\u043e\u0439 500 \u041c\u0413\u0446. \u041c\u044b, \u043a\u043e\u043d\u0435\u0447\u043d\u043e, \u043d\u0435 \u0441\u043c\u043e\u0433\u043b\u0438 \u043e\u0442\u043a\u0430\u0437\u0430\u0442\u044c. \u0412\u0435\u0434\u044c \u043d\u0443\u0436\u043d\u043e \u0431\u044b\u043b\u043e \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 «\u0418\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0435 \u0421\u0438\u0441\u0442\u0435\u043c\u044b», \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u044f \u0437\u043d\u0430\u044e \u0434\u0430\u0432\u043d\u043e. \u041d\u0430 \u0437\u0430\u0440\u0435 \u0438\u043d\u0436\u0435\u043d\u0435\u0440\u043d\u043e\u0439 \u0434\u0435\u044f\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043c\u043d\u0435 \u043f\u0440\u0438\u0448\u043b\u043e\u0441\u044c \u0440\u0430\u0431\u043e\u0442\u0430\u0442\u044c \u0441 \u0438\u0445 \u0436\u0435\u043b\u0435\u0437\u043e\u043c \u0438 \u0441\u043e\u0444\u0442\u043e\u043c.<\/p>\n

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Dhe pastaj erdhi nj\u00eb shok i shtrenjt\u00eb mikkab<\/a><\/noindex> nga Shfaqja e Droneve<\/a><\/noindex> dhe k\u00ebrkoi t\u00eb krijonim nj\u00eb sistem pozicionimi p\u00ebr dron\u00ebt pa GPS. Duhet, tha, t\u00eb nisnim nj\u00eb shfaqje n\u00eb ambiente t\u00eb mbyllura. Dhe n\u00eb k\u00ebto koh\u00eb, nuk \u00ebsht\u00eb shum\u00eb e d\u00ebshiruara q\u00eb t\u00eb l\u00ebshosh n\u00eb qiell disa miliona para me nj\u00eb GPS t\u00eb pasigurt. Nd\u00ebrsa nd\u00ebrhyrjet dhe spufing-u i navigacionit satelitor po lul\u00ebzojn\u00eb<\/a><\/noindex>.<\/p>\n

<\/p>\n

P\u00ebr pozicionimin pa satelit\u00eb me sakt\u00ebsi m\u00eb t\u00eb mir\u00eb se dhjet\u00eb centimetra n\u00eb nj\u00eb zon\u00eb deri n\u00eb nj\u00eb kilometr, nuk kam gjetur gj\u00eb tjet\u00ebr p\u00ebrve\u00e7 teknologjis\u00eb UWB. Ka nj\u00eb koh\u00eb t\u00eb gjat\u00eb q\u00eb n\u00eb treg \u00ebsht\u00eb kompania DecaWave, e cila prodhon \u00e7ipin DW1000 dhe modulet e bazuara mbi t\u00eb. \u00c7ipi \u00ebsht\u00eb nj\u00eb transceiver t\u00eb standardit IEEE 802.15.4-2011. Si\u00e7 duket, ai \u00ebsht\u00eb unik, me nj\u00eb baz\u00eb t\u00eb dyfisht\u00eb ose madje trefishe. Shpresoj se do t\u00eb mund ta eksplorojm\u00eb thell\u00ebsit\u00eb e tij n\u00eb vitet e ardhshme dhe t\u00eb shkruajm\u00eb rreth k\u00ebtij. M\u00eb par\u00eb nuk do t\u00eb arrijm\u00eb ta b\u00ebjm\u00eb k\u00ebt\u00eb.<\/p>\n

<\/p>\n

Por sot nuk \u00ebsht\u00eb fjala p\u00ebr pozicionimin, p\u00ebr k\u00ebt\u00eb do t\u00eb flasim n\u00eb episodet e ardhshme.<\/p>\n

<\/p>\n

\u0421\u0435\u0433\u043e\u0434\u043d\u044f \u043c\u044b \u0434\u0435\u043b\u0430\u0435\u043c \u0437\u0430\u043f\u0438\u0441\u044c \u0441\u0438\u0433\u043d\u0430\u043b\u0430 DW1000. \u0410 \u043f\u043e\u043b\u043e\u0441\u0430 \u044d\u0442\u043e\u0433\u043e \u0441\u0438\u0433\u043d\u0430\u043b\u0430 \u043d\u0438 \u043c\u043d\u043e\u0433\u043e, \u043d\u0438 \u043c\u0430\u043b\u043e, \u0430 1000 \u0438\u043b\u0438 500 \u041c\u0413\u0446, \u0447\u0442\u043e \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043d\u043e\u043c\u0435\u0440\u043e\u043c \u043a\u0430\u043d\u0430\u043b\u0430. «\u0421\u043e\u0432\u0435\u0440\u0448\u0435\u043d\u043d\u043e \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u043e» \u043d\u0430 \u0441\u043e\u0441\u0435\u0434\u043d\u0435\u043c \u0441\u0442\u043e\u043b\u0435 \u0441\u0442\u043e\u044f\u043b \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440 \u0441 \u043f\u043b\u0430\u0442\u043e\u0439 FMC126P<\/a><\/noindex> \u043e\u0442 «\u0418\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0445 \u0421\u0438\u0441\u0442\u0435\u043c» \u0441 FMC-\u043c\u0435\u0437\u0430\u043d\u0438\u043d\u043e\u043c AD9208-3000EBZ<\/a><\/noindex> nga Analog Devices.<\/p>\n

<\/p>\n

\u0417\u0434\u0435\u0441\u044c \u0441\u043b\u0435\u0434\u0443\u0435\u0442 \u043e\u0442\u043c\u0435\u0442\u0438\u0442\u044c «\u0434\u043b\u044f \u043f\u0440\u043e\u043a\u0443\u0440\u043e\u0440\u0430», \u0447\u0442\u043e \u0410\u0426\u041f AD9208 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u0441\u0435\u0433\u043e\u0434\u043d\u044f \u0441\u0430\u043d\u043a\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0442\u0435\u0445\u043d\u0438\u043a\u043e\u0439. \u041b\u0435\u0433\u0430\u043b\u044c\u043d\u043e \u043a\u0443\u043f\u0438\u0442\u044c \u0435\u0433\u043e \u0432 \u0420\u043e\u0441\u0441\u0438\u044e \u043d\u0435\u043b\u044c\u0437\u044f, \u0445\u043e\u0442\u044c \u0438\u043d\u043e\u0433\u0434\u0430 \u0438 \u043e\u0447\u0435\u043d\u044c \u0445\u043e\u0447\u0435\u0442\u0441\u044f. \u041d\u043e \u0434\u0430\u043d\u043d\u044b\u0439 \u043a\u043e\u043d\u043a\u0440\u0435\u0442\u043d\u044b\u0439 \u043c\u043e\u0434\u0443\u043b\u044c \u0431\u044b\u043b \u043a\u0443\u043f\u043b\u0435\u043d \u043e\u0447\u0435\u043d\u044c \u0434\u0430\u0432\u043d\u043e, \u043a\u043e\u0433\u0434\u0430 \u0441\u0430\u043d\u043a\u0446\u0438\u0439 \u0435\u0449\u0435 \u043d\u0435 \u0431\u044b\u043b\u043e. \u041e\u043d \u0447\u0438\u0441\u0442, \u043a\u0430\u043a \u0434\u0443\u0448\u0430 \u043c\u043b\u0430\u0434\u0435\u043d\u0446\u0430. \u041d\u0430\u0434\u0435\u044e\u0441\u044c, \u044d\u0442\u043e \u043f\u0440\u0438\u0437\u043d\u0430\u043d\u0438\u0435 \u0431\u0443\u0434\u0435\u0442 \u043f\u043e\u0434\u0448\u0438\u0442\u043e \u043a \u0434\u0435\u043b\u0443 \u0438 \u0437\u0430\u0447\u0442\u0435\u0442\u0441\u044f \u043f\u043e\u0434\u0441\u0443\u0434\u0438\u043c\u043e\u043c\u0443.<\/p>\n

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Nuk do t\u00eb hyjm\u00eb tani n\u00eb detaje p\u00ebr zhvillimin e softuerit p\u00ebr regjistrimin e rrjedh\u00ebs s\u00eb t\u00eb dh\u00ebnave n\u00eb memorien e kompjuterit. Deri tani, fatkeq\u00ebsisht, nuk mund t\u00eb publikojm\u00eb kodin burimor t\u00eb aplikacionit p\u00ebr Linux. Por shpresojm\u00eb t\u00eb arrijm\u00eb lejen p\u00ebr k\u00ebt\u00eb her\u00eb t\u00eb ardhshme. Duhet t\u00eb theksojm\u00eb se nuk ishte e leht\u00eb, duke marr\u00eb parasysh programet e ofruara nga Sistemet Instrumentale. I gjith\u00eb ADC-ja dhe sistemi i tij t\u00eb mir\u00ebmbajtjes dhe t\u00eb daljes s\u00eb t\u00eb dh\u00ebnave n\u00eb teknologjin\u00eb JESD204B jan\u00eb mjaft t\u00eb komplikuara p\u00ebr t'u kuptuar, p\u00ebrve\u00e7 k\u00ebsaj, moduli nga AD k\u00ebrkonte patch-e harduerike. Sinjali REFCLK \u00ebsht\u00eb domosdoshm\u00ebrisht i nevojsh\u00ebm p\u00ebr sistemin e hyrjes, dhe ai hyn n\u00eb modul n\u00eb k\u00ebto kontakte t\u00eb lidhjes FMC, dhe p\u00ebr rrjedhoj\u00eb, nuk arrin n\u00eb kontaktet e nevojshme t\u00eb FPGA-s\u00eb. Duhet t\u00eb vendosnim nj\u00eb patch, t\u00eb cilin mund ta shihni n\u00eb fotografin\u00eb m\u00eb posht\u00eb \u2014 dy tela t\u00eb kuq. Sigurisht kishim dyshime se kjo do t\u00eb funksiononte. Frekuenca e sinjalit t\u00eb takimeve \u00ebsht\u00eb e lart\u00eb \u2014 375 MHz, dhe patch-i \u00ebsht\u00eb i tmerrsh\u00ebm. Por sistemi arriti ta menaxhoj\u00eb.<\/p>\n

<\/p>\n

\"Regjistrimi<\/p>\n

<\/p>\n

E gjith\u00eb kuzhina duket k\u00ebshtu.<\/p>\n

<\/p>\n

\"Regjistrimi<\/p>\n

<\/p>\n

K\u00ebtu mund t\u00eb v\u00ebrehet nj\u00eb computer me nj\u00eb sistem t\u00eb mir\u00eb hyrjeje-daljeje, karta FMC126P, mezanina AD9208-3000EBZ. Nd\u00ebr gjenerator\u00ebt: nj\u00eb gjenerator 3000 MHz p\u00ebr taktimin e ADC-s\u00eb, gjenerator 770 MHz p\u00ebr REFCLK. Kabllot me konektor\u00eb SMA lidhin gjenerator\u00ebt dhe sjellin sinjalin hyr\u00ebs.<\/p>\n

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Shpejt\u00ebsia e pap\u00ebrpunuar e t\u00eb dh\u00ebnave nga dalja e ADC-s\u00eb, n\u00ebse nuk merret me detaje, arrin n\u00eb 12 GB\/s nga dy kanale. Sipas matjeve dhe deklarat\u00ebs s\u00eb prodhuesit t\u00eb kart\u00ebs FMC126P, shpejt\u00ebsia maksimale e hyrjes \u00ebsht\u00eb 5 GB\/s. Prandaj, n\u00eb ADC p\u00ebrdor\u00ebm vet\u00ebm nj\u00eb kanal dhe e kaluam at\u00eb p\u00ebrmes DDC (Digital Down Converter) t\u00eb integruar n\u00eb AD9208 me de\u00e7imim me kat\u00ebr. K\u00ebshtu, rrjedha e t\u00eb dh\u00ebnave arriti n\u00eb 3 GB\/s (frekuenca e mostrimit 750 MHz, sinjal kompleks 16-bitis).<\/p>\n

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Kontrollimi i sistemit p\u00ebr t\u00eb regjistruar t\u00eb dh\u00ebnat \u00ebsht\u00eb shum\u00eb i thjesht\u00eb: thjesht monitoroni bit\u00ebt e statusit FIFO t\u00eb FPGA-s. N\u00ebse gjat\u00eb nat\u00ebs nuk ka pasur asnj\u00eb ngjarje Overflow FIFO, at\u00ebher\u00eb bita nuk do t\u00eb jet\u00eb aktivizuar. Dhe ne me g\u00ebzim konstatom\u00eb se nuk kishte humbje t\u00eb t\u00eb dh\u00ebnave. N\u00eb fillim, sigurisht q\u00eb kontrollojm\u00eb se si punon regjistrimi i bit\u00ebve t\u00eb statusit. Form\u00ebn e sinjalit e shqyrtojm\u00eb gjithashtu nga skedari, p\u00ebr t'u siguruar q\u00eb cil\u00ebsia e regjistrimit t\u00eb sinjalit ADC p\u00ebrputhet me dokumentacionin.<\/p>\n

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Por cili sinjal do t\u00eb jet\u00eb i denj\u00eb p\u00ebr nj\u00eb sistem t\u00eb till\u00eb hyrjeje? Sigurisht, UWB nga tavolina p\u00ebrkat\u00ebse!<\/p>\n

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Me fat, p\u00ebr sistemin e pozicionimit t\u00eb droneve, ne zgjodh\u00ebm frekuenc\u00ebn e kanalit 4 GHz. Kjo korrespondon me kanalet 4 dhe 2 sipas terminologjis\u00eb DW1000 (Figura 13 e datasheet-it). Ne krijuam nj\u00eb anten\u00eb t\u00eb integruar n\u00eb bord p\u00ebr k\u00ebt\u00eb frekuenc\u00eb, ose m\u00eb mir\u00eb th\u00ebn\u00eb, p\u00ebr k\u00ebt\u00eb gam\u00eb. T\u00eb sinkronizosh at\u00eb n\u00eb nj\u00eb gam\u00eb kaq t\u00eb gjer\u00eb ishte e v\u00ebshtir\u00eb. Por gj\u00ebja rezultoi shum\u00eb t\u00ebrheq\u00ebse! Disa thon\u00eb se i ngjan nj\u00eb simboli... me vesh\u00eb.<\/p>\n

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\"Regjistrimi<\/p>\n

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Sinjali 4 GHz me gj\u5bbdsi 500 MHz arrin n\u00eb brezin e tret\u00eb t\u00eb Nyquist dhe ka intervale mbrojt\u00ebse t\u00eb mjaftueshme p\u00ebr t\u00eb shmangur mbivendosjen e spektrit. Prandaj, ne thjesht e kemi futur sinjalin DW1000 direkt n\u00eb hyrjen e ADC AD9208.<\/p>\n

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Kemi marr\u00eb dy skedare: nj\u00eb me frekuenc\u00eb PRF prej 64 MHz, tjetri 16 MHz. Shpejt\u00ebsia e transmetimit ishte e vendosur minimale p\u00ebr DW1000 \u2014 110 kbps.<\/p>\n

<\/p>\n

Kjo i pari<\/a><\/noindex> skedari, ky \u00ebsht\u00eb pjes\u00ebn e dyt\u00eb<\/a><\/noindex>. Kujdes, skedar\u00ebt jan\u00eb t\u00eb m\u00ebdhenj!<\/p>\n

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N\u00eb skedarin e par\u00eb shohim paketa me nj\u00eb gjat\u00ebsi prej rreth 750 mostrave ose 1000 nanosekondash.<\/p>\n

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\"Regjistrimi<\/p>\n

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N\u00eb skedarin e dyt\u00eb, paketat jan\u00eb kat\u00ebr her\u00eb m\u00eb t\u00eb shkurtra.<\/p>\n

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\"Regjistrimi<\/p>\n

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Dhe kjo p\u00ebrkon me standardin IEEE 802.15.4-2011 n\u00eb nivelin fizik UWB:<\/p>\n

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\"Regjistrimi<\/p>\n

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\u041c\u043e\u0434\u0443\u043b\u044f\u0446\u0438\u044f \u0432\u043d\u0443\u0442\u0440\u0438 \u043f\u0430\u043a\u0435\u0442\u0430 \u043f\u043e\u0445\u043e\u0436\u0430 \u043d\u0430 \u0444\u0430\u0437\u043e\u0432\u0443\u044e, \u0447\u0442\u043e \u0442\u043e\u0436\u0435 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u0435\u0442 \u0443\u043a\u0430\u0437\u0430\u043d\u043d\u043e\u0439 \u0432 \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u0435 BPSK. \u0421\u0430\u043c \u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442 \u0432\u044b \u0441\u043c\u043e\u0436\u0435\u0442\u0435 \u043d\u0430\u0439\u0442\u0438 \u0432 \u0418\u043d\u0442\u0435\u0440\u043d\u0435\u0442\u0435, \u0438\u0449\u0438\u0442\u0435 «IEEE 802.15.4-2011».<\/p>\n

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N\u00ebse shtrijm\u00eb pak drit\u00ebn e v\u00ebzhgimit, mund t\u00eb vihen re edhe paqart\u00ebsit\u00eb n\u00eb ndjekjen e paketave, q\u00eb p\u00ebrputhet me p\u00ebrshkrimin e modulimit hibrid IEEE 802.15.4-2011 UWB \u2014 modulim pozicional-fazor (BPM-BPSK).<\/p>\n

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\"Regjistrimi<\/p>\n

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\"Regjistrimi<\/p>\n

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N\u00eb p\u00ebrgjith\u00ebsi, un\u00eb e gjej \u00e7ipin DW1000 dhe modulimin e k\u00ebtij PHY UWB t\u00eb mrekulluesh\u00ebm, \u00e7ka do t\u00eb thot\u00eb \u00e7far\u00ebdo, n\u00eb nivelin e ushtarak\u00ebve JTIDS. Kjo \u00ebsht\u00eb pasioni im i ri. T\u00eb tjera do t\u00eb vijojn\u00eb!<\/p>\n

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N\u00eb nj\u00ebr\u00ebn an\u00eb, do t\u00eb analizojm\u00eb DW1000, nd\u00ebrsa n\u00eb an\u00ebn tjet\u00ebr, do t\u00eb merremi me standardin IEEE 802.15.4.<\/p>\n

Burimi: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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