Posachedwapa, maiko awiri osiyana adasonkhana pamodzi mu labotale yathu: dziko la ma transceivers otsika mtengo komanso dziko la makina ojambulira ma wailesi otsika mtengo.
Choyamba, abwenzi athu apamtima anatiyandikira kuti apange mapulogalamu ojambulira chizindikiro ndi gulu la 500 MHz. Ife, ndithudi, sitikanatha kukana. Pambuyo pake, kunali koyenera kuchita izi pa bolodi kuchokera ku kampani ya "Instrumental Systems", yomwe ndakhala ndikuidziwa kwa nthawi yaitali. Kumayambiriro kwa ntchito yanga ya uinjiniya, ndinayenera kugwira ntchito ndi hardware ndi mapulogalamu awo.
Ndiyeno bwenzi langa lokondedwa linabwera kuchokera ndikufunsa kuti apange dongosolo loyikira ma drones opanda GPS. Ndikofunikira, akutero, kuyambitsa chiwonetserochi m'nyumba. Ndipo masiku ano, mumsewu, simukufuna kukhazikitsa madola mamiliyoni angapo kumwamba pa GPS yosadalirika. Sat navigation kusokoneza ndi spoofing .
Pakuyika popanda ma satelayiti olondola kuposa ma centimita khumi pamalo ofikira kilomita imodzi, sindinapeze china chilichonse kupatula ukadaulo wa UWB. DecaWave yakhala pamsika kwa nthawi yayitali, ikupanga DW1000 chip ndi ma module otengera izo. Chip ndi transceiver ya UWB ya IEEE 802.15.4-2011 muyezo. Mwa njira, chinthucho ndi chapadera, chokhala ndi pansi pawiri kapena katatu. Ndikukhulupirira kuti titha kuzama m'zaka zingapo zikubwerazi ndikulemba za izi. Inu ndithudi simungathe kuchita izo kale.
Koma lero sitikunena za kuyikika; tikambirana za izi mndandanda wotsatira.
Lero tikujambula chizindikiro cha DW1000. Ndipo bandwidth ya siginecha iyi si yochulukirapo kapena yocheperako, koma 1000 kapena 500 MHz, yomwe imatsimikiziridwa ndi nambala yanjira. βMwangoziβ panali kompyuta yokhala ndi bolodi patebulo lotsatira kuchokera ku "Instrumental Systems" yokhala ndi FMC mezzanine kuchokera ku Zida za Analogi.
Tiyenera kuzindikira apa "kwa wozenga mlandu" kuti AD9208 ADC ndiukadaulo wovomerezeka masiku ano. Simungagule mwalamulo ku Russia, ngakhale nthawi zina mumafunadi. Koma gawo ili lidagulidwa kalekale, pomwe panalibe zilango. Iye ndi woyera, ngati moyo wa mwana. Ndikukhulupirira kuti chivomerezochi chidzaperekedwa pamlanduwo ndipo chidzaperekedwa kwa wotsutsa.
Tsopano sitingapite mwatsatanetsatane kupanga mapulogalamu ojambulira mndandanda wa zitsanzo mu kukumbukira makompyuta. Tsoka ilo, sitingathe kufalitsa magwero a pulogalamu ya Linux. Koma tikuyembekeza kupeza chilolezo cha izi nthawi ina. Ndizofunikira kudziwa kuti izi sizinali zophweka, ngakhale poganizira zomwe zidaperekedwa ndi Instrumental Systems. ADC palokha ndi kachitidwe ka mawotchi ndi kutulutsa zitsanzo pogwiritsa ntchito ukadaulo wa JESD204B ndizovuta kumvetsetsa, ndipo zigamba za Hardware zimafunikiranso mu gawo la AD. Chizindikiro cha REFCLK ndichofunikira kwambiri pamakina olowera, koma pa module imapita ku miyendo yolakwika ya cholumikizira cha FMC ndipo, motero, sichimapita kumanja a FPGA. Ndinayenera kuyika chigamba, chomwe chingakhoze kuwonedwa pa chithunzi pansipa - mawaya awiri ofiira. Panali, ndithudi, kukayikira kuti zingathandize. Liwiro la wotchi ndi lokwera pa 375 MHz ndipo chigambacho ndi choyipa. Koma dongosolo linapirira.
Khitchini yonse ikuwoneka chonchi.
Apa mutha kuwona kompyuta yokhala ndi dongosolo labwino la I/O, bolodi la FMC126P, ndi mezzanine ya AD9208-3000EBZ. Mwa majenereta: jenereta ya 3000 MHz yowotchera ADC, jenereta ya 770 MHz ya REFCLK. Zingwe zokhala ndi zolumikizira za SMA zimalumikiza majenereta ndikupereka chizindikiro cholowera.
Kuthamanga kwa data yaiwisi kuchokera ku zotsatira za ADC, ngati simupita mwatsatanetsatane, ndi 12 GB / s kuchokera ku njira ziwiri. Malinga ndi miyeso komanso malinga ndi zomwe wopanga adalengeza pa bolodi la FMC126P, liwiro lolowera kwambiri ndi 5 GB/s. Chifukwa chake, tidagwiritsa ntchito njira imodzi yokha mu ADC ndikudutsa mu DDC (Digital Down Converter) yomangidwa mu AD9208 ndikuchepetsa anayi. Choncho, kuyenda kwa deta kunali 3 GB / s (sampling frequency 750 MHz, 16-bit yovuta chizindikiro).
Kuwona kuti makinawa ali ndi nthawi yojambulira zitsanzo ndizosavuta: muyenera kungoyang'anira zomata za FPGA FIFO. Ngati panalibe zochitika za FIFO Overflow usiku wonse, pang'ono sichidzakhazikitsidwa. Ndipo timanena mosangalala kuti panalibe kutayika kwa kuwerenga. Choyamba, timayang'ana, zachidziwikire, kuti magawo a latching akugwira ntchito. Timayang'ananso mawonekedwe a chizindikiro kuchokera pa fayilo kuti tiwonetsetse kuti khalidwe la chizindikiro cha ADC chogwidwa likugwirizana ndi zolembazo.
Koma ndi chizindikiro chamtundu wanji chomwe chingakhale choyenera kuyika makina otere? Zachidziwikire UWB kuchokera patebulo lotsatira!
Mwamwayi, tidasankha ma frequency a 4 GHz pamayendedwe a drone. Izi zikugwirizana ndi njira 4 ndi 2 mu terminology ya DW1000 (Chithunzi 13 cha database). Tinapanga mlongoti womangidwa pa bolodi la ma frequency awa, kapena, kunena bwino, pamtunduwu. Sizinali zophweka kuyigwirizanitsa pa gulu lalikulu chotere. Koma chinthucho chinakhala chonyansa! Ena amati amawoneka ngati chizindikiro ... ndi makutu.
Chizindikiro cha 4 GHz chokhala ndi 500 MHz bandwidth imagwera mkati mwa gulu lachitatu la Nyquist ndipo imakhala ndi nthawi yokwanira yolondera kuti asatengeke. Chifukwa chake, tidangolumikiza chizindikiro cha DW1000 ndi kulowetsa kwa AD9208 ADC mwachindunji.
Tinalandira mafayilo awiri: imodzi yokhala ndi mafupipafupi a PRF a 64 MHz, ina - 16 MHz. Liwiro lotumizira lidayikidwa kuti likhale locheperako kwa DW1000 - 110 kbit/s.
izi file, izi . Samalani, mafayilo ndi akulu!
Mufayilo yoyamba tikuwona mapaketi okhala ndi zitsanzo za 750 kapena 1000 nanoseconds.
Mu fayilo yachiwiri, mapaketiwo ndi amfupi kanayi.
Ndipo izi zikugwirizana kwathunthu ndi muyezo wa IEEE 802.15.4-2011 malinga ndi mawonekedwe a UWB:
Kusinthasintha mkati mwa paketi ndikufanana ndi kusintha kwa gawo, komwe kumagwirizananso ndi zomwe zafotokozedwa muyeso wa BPSK. Mutha kupeza muyezo womwewo pa intaneti, yang'anani "IEEE 802.15.4-2011".
Ngati mukulitsa pang'ono zenera la nthawi yowonera, mutha kuwonanso kusagwirizana kwa mapaketiwo, omwe amafanana ndi kufotokozera kusinthika kwa hybrid IEEE 802.15.4-2011 UWB - gawo-gawo (BPM-BPSK).
Kawirikawiri, ndimapeza chipangizo cha DW1000 ndi kusintha kwa UWB PHY kukhala bomba, zirizonse zomwe zikutanthauza, chinthu, pamlingo wa JTIDS wankhondo. Ichi ndi chokonda changa chatsopano. Zipitilizidwa!
Kumbali imodzi, tidzakumba DW1000, kumbali inayo, tidzathana ndi muyezo wa IEEE 802.15.4.
Source: www.habr.com