Tam sim no, nrog kev nce qib zuj zus ntawm StarLink, Telesat, OneWeb thiab AST cov phiaj xwm xa mus rau satellite constellation, kev sib txuas lus qis-orbit satellite tau nce ntxiv. Kev hu rau "kev sib koom ua ke" ntawm kev sib txuas lus satellite thiab kev sib txuas lus hauv av kuj tau nrov dua. Chen Shanzhi ntseeg hais tias cov laj thawj tseem ceeb rau qhov no yog kev kawm txuj ci thiab kev hloov pauv hauv kev thov.
Hais txog kev siv thev naus laus zis, ib qho yog qhov kev nce qib ntawm satellite launching thev naus laus zis, suav nrog kev hloov pauv thev naus laus zis xws li "ib xub nrog ntau lub satellites" thiab foob pob hluav taws rov ua dua tshiab; qhov thib ob yog qhov kev nce qib ntawm satellite manufacturing technology, nrog rau kev nce qib ntawm cov ntaub ntawv, cov khoom siv hluav taws xob, thiab kev siv thev naus laus zis; qhov thib peb yog integrated circuit technology Kev nce qib ntawm satellites, miniaturization, modularization, thiab componentization ntawm satellites, thiab kev txhim kho ntawm on-board ua muaj peev xwm; qhov thib plaub yog kev nce qib ntawm kev sib txuas lus thev naus laus zis. Nrog rau kev hloov pauv ntawm 3G, 4G, thiab 5G, cov kav hlau txais xov loj loj, millimeter yoj Nrog kev nce qib hauv cov duab thiab lwm yam, cov thev naus laus zis hauv kev sib txuas lus hauv av tuaj yeem siv rau satellites.
Ntawm qhov kev thov sab, nrog rau kev nthuav dav ntawm kev lag luam kev lag luam thiab kev ua haujlwm ntawm tib neeg, qhov zoo ntawm kev sib txuas lus satellite thoob ntiaj teb kev pab them nqi thiab qhov chaw npog tau pib tshwm sim. Raws li niaj hnub no, cov kev sib txuas lus hauv av hauv av tau them ntau dua 70% ntawm cov pejxeem, tab sis vim yog cov txheej txheem kev lag luam thiab kev lag luam, nws tsuas yog siv li 20% ntawm thaj av, uas tsuas yog kwv yees li 6% raws li thaj tsam ntawm lub ntiaj teb. Nrog rau txoj kev loj hlob ntawm kev lag luam, aviation, dej hiav txwv, nuv ntses, roj av, ib puag ncig saib xyuas, sab nraum zoov kev ua ub no, nrog rau lub teb chaws lub tswv yim thiab kev sib txuas lus tub rog, thiab lwm yam, muaj kev xav tau zoo rau thaj chaw dav thiab thaj chaw.
Chen Shanzhi ntseeg hais tias kev sib txuas ncaj qha ntawm cov xov tooj ntawm tes rau satellites txhais tau tias kev sib txuas lus satellite yuav nkag mus rau cov neeg siv khoom lag luam los ntawm kev lag luam daim ntawv thov kev lag luam. "Txawm li cas los xij, nws tsis txaus ntseeg hais tias Starlink tuaj yeem hloov lossis hloov pauv 5G." Chen Shanzhi tau taw qhia tias kev sib txuas lus satellite muaj ntau yam kev txwv. Qhov thib ib yog qhov tsis raug cai ntawm thaj chaw. Peb lub high-orbit synchronous satellites tuaj yeem npog tag nrho lub ntiaj teb. Pua pua ntawm lub voj voog qis qis txav ntawm kev kub ceev txheeb ze rau hauv av thiab tuaj yeem npog qhov sib npaug. Ntau qhov chaw tsis raug cai vim tias tsis muaj cov neeg siv tiag tiag. ; Qhov thib ob, satellite teeb liab tsis tuaj yeem npog sab hauv tsev thiab sab nraum zoov uas npog cov hla hla thiab roob hav zoov; thib peb, qhov miniaturization ntawm satellite terminals thiab qhov tsis sib haum xeeb ntawm cov kav hlau txais xov, tshwj xeeb tshaj yog cov neeg tau dhau los ua cov kav hlau txais xov built-in ntawm cov xov tooj ntawm tes zoo tib yam (cov neeg siv tsis muaj kev nkag siab), Tam sim no kev lag luam satellite xov tooj ntawm tes tseem muaj cov kav hlau txais xov sab nraud; Thib plaub, qhov ua tau zoo ntawm kev sib txuas lus satellite yog qis dua li ntawm kev sib txuas lus ntawm tes ntawm tes. Spectrum efficiency yog siab tshaj 10 ntsis / s / Hz. Thaum kawg, thiab qhov tseem ceeb tshaj plaws, vim tias nws muaj ntau yam kev sib txuas xws li kev tsim khoom siv satellite, kev xa xov hluav taws xob, khoom siv hauv av, kev ua haujlwm satellite thiab kev pabcuam, kev tsim kho thiab kev ua haujlwm thiab kev saib xyuas tus nqi ntawm txhua qhov kev sib txuas lus satellite yog kaum zaug lossis ntau pua zaus ntawm av. chaw nres tsheb hauv paus, yog li tus nqi sib txuas lus yuav nce ntxiv. Siab dua 5G terrestrial cellular kev sib txuas lus.
Piv nrog rau cov xov tooj ntawm tes hauv av, cov kev sib txawv tseem ceeb thiab cov teeb meem ntawm kev sib txuas lus satellite yog raws li hauv qab no: 1) Cov yam ntxwv ntawm kev nthuav tawm ntawm satellite channel thiab terrestrial channel sib txawv, kev sib txuas lus satellite muaj kev nthuav dav ntev, teeb liab propagation txoj kev poob yog loj, thiab kis tau tus mob ncua yog loj. Nqa cov kev sib tw los txuas cov peev nyiaj, kev sib raug zoo ntawm lub sijhawm thiab cov phiaj xwm sib kis; 2) Kev kub ceev satellite txav, ua rau lub sij hawm synchronization nrhiav kev ua tau zoo, zaus synchronization nrhiav (Doppler nyhuv), kev tswj kev txav mus los (ntau zaus beam switching thiab inter-satellite switching), modulation Demodulation kev ua tau zoo thiab lwm yam teeb meem. Piv txwv li, lub xov tooj ntawm tes tsuas yog ob peb puas meters mus rau ib mais ntawm qhov chaw nres tsheb hauv av, thiab 5G tuaj yeem txhawb nqa lub davhlau ya nyob twg ceev ntawm 500km / h; Thaum lub hnub qub qis qis yog kwv yees li 300 txog 1,500km deb ntawm lub xov tooj ntawm tes hauv av, thiab satellite txav ntawm qhov ceev ntawm li 7.7 txog 7.1km / s txheeb ze rau hauv av, tshaj 25,000km / h.
Post lub sij hawm: Dec-20-2022
