FHSS, zaus hopping kis spectrum technology, nyob rau hauv cov xwm txheej ntawm synchronization thiab simultaneity, lees txais cov teeb liab kis los ntawm nqaim-band nqa ntawm ib hom tshwj xeeb (daim ntawv tshwj xeeb no muaj qee zaus, thiab lwm yam) ntawm ob qho kawg.Rau ib lub receiver tsis muaj hom tshwj xeeb, hopping signal generated los ntawm FHSS tsuas yog impulse suab rau nws thiab yuav tsis tau txais ib feem ntawm lub teeb liab.
Vim li cas thiaj xav tau FHSS?Ntawm chav kawm, cov ntaub ntawv kis tau tus mob yuav tsis loj heev tsuas yog nyob rau hauv qhov kev teev tseg.Yog tias lub sijhawm xa tawm ntawm ib pob ntawv cov ntaub ntawv tuaj yeem tshaj qhov siab tshaj plaws channel nyob lub sijhawm tso cai los ntawm cov kev cai cuam tshuam, FHSS thev naus laus zis yuav raug siv.Txhawm rau ua kom lub zaus hopping hom hauv Lora, ua haujlwm lub sijhawm reg hopping thiab zaus hopping lub sijhawm sau npe los teeb tsa lawv mus rau qhov tsis yog xoom.Cov hauv qab no piav qhia cov ntsiab lus kev paub ntawm ntu no kom meej los ntawm lub hauv paus ntsiab lus.
Txoj Cai:Lub hauv paus ntsiab lus ntawm kev ua haujlwm ntawm FHSS zaus hopping kis spectrum scheme yog: tias thaum zaus hopping yuav tsum tau rau ib feem ntawm txhua Lora cov ntaub ntawv packet, cov ntsiab lus yuav tsum tau xa los ntawm lub zaus hopping channel teem los ntawm MCU tswj.Qhov zaus yuav tsum tau hopped yog yuav tsum tau xa raws li cov lus nug zaus.Tom qab cov ntaub ntawv xa mus tiav thiab lub sij hawm predetermined zaus hopping xaus, lub transmitter thiab receiver hloov mus rau lwm channel nyob rau hauv lub zaus hopping predefined daim ntawv mus txuas ntxiv kis thiab tau txais ib feem ntawm cov ntaub ntawv tom ntej.Lub sij hawm nyob rau hauv ib qho channel yog txiav txim los ntawm lub sij hawm hopping zaus, uas yog ib tug integer ntau ntawm cov cim ntev.
Cov txheej txheem ntawm kev xa tawmthiab tau txais los ntawm zaus hopping pib los ntawm channel 0. Lub preamble thiab header raug xa mus rau channel 0 ua ntej.Txhua lub sij hawm xa cov ntaub ntawv xa mus, kev nyeem ntawv ntawm cov txee ntawm cov channel tam sim no (nyob hauv reg hopping channel) yuav nce ntxiv, thiab cov teeb liab cuam tshuam FHSS hloov channel yuav raug tsim kom ua tiav qhov zaus hopping.Ib zaus tshiab yuav tsum tau teem caij rau lub sij hawm hopping zaus los xyuas kom meej tias qhov zaus tshiab yuav raug them rau hauv qhov zaus hopping tom ntej.Txheeb xyuas cov txheej txheem: pib FHSS txais tos ntawm channel 0. Tom qab kuaj xyuas qhov preamble, tus txais yuav pib cov txheej txheem hopping zaus saum toj no.Lub sijhawm no, yog CRC ntawm lub header tsis raug, tus txais yuav cia li thov channel 0 (packet retransmission mechanism) thiab rov pib xyuas qhov preamble.
Cov lus piav qhia saum toj no ntawm lub hauv paus ntsiab lus ntawm zaus hopping kis spectrum kev sib txuas lus (FHSS) coj los rau koj los ntawmShenzhen HDV Phoelectron Technology Co., Ltd.Vam tias tsab xov xwm no tuaj yeem pab koj nce koj txoj kev paub.Dhau li ntawm tsab xov xwm no yog tias koj tab tom nrhiav rau lub tuam txhab kev sib txuas lus zoo fiber ntau cov khoom lag luam koj tuaj yeem xav txogtxog peb.
