Kev faib tawm zaus ntawm Beidou Navigation System

Lub Beidou Navigation Satellite System (BDS, tseem hu ua COMPASS, Suav txhais lus: BeiDou) yog lub ntiaj teb satellite navigation system uas Tuam Tshoj tsim tawm ywj pheej. Nws yog lub satellite navigation system thib peb tom qab GPS thiab GLONASS.

Beidou Tiam I

Qhov kev faib tawm zaus ntawm Beidou Generation I feem ntau cuam tshuam nrog Radio Determination Satellite Service (RDSS) bands, tshwj xeeb tshaj yog muab faib ua uplink thiab downlink bands:
a) Uplink Band: Cov band no yog siv rau cov khoom siv los xa cov teeb liab mus rau cov satellites, nrog rau ntau zaus ntawm 1610MHz txog 1626.5MHz, uas yog L-band. Kev tsim cov band no tso cai rau cov khoom siv hauv av xa cov lus thov qhov chaw thiab lwm cov ntaub ntawv tseem ceeb rau cov satellites.
b) Downlink Band: Cov band no yog siv rau cov satellites los xa cov teeb liab mus rau cov khoom siv, nrog rau ntau zaus ntawm 2483.5MHz txog 2500MHz, uas yog S-band. Kev tsim band no ua rau cov satellites muab cov ntaub ntawv navigation, cov ntaub ntawv qhov chaw, thiab lwm yam kev pabcuam tsim nyog rau cov khoom siv hauv av.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias qhov kev faib tawm zaus ntawm Beidou Tiam I yog tsim los ua kom tau raws li qhov yuav tsum tau ua thiab qhov tseeb ntawm qhov chaw ntawm lub sijhawm ntawd. Nrog rau kev nce qib ntawm thev naus laus zis thiab kev txhim kho tas mus li rau Beidou system, cov tiam tom ntej, suav nrog Beidou Tiam II thiab III, tau siv cov zaus sib txawv thiab cov txheej txheem hloov kho teeb liab los muab kev pabcuam navigation thiab positioning uas muaj kev ntseeg siab dua thiab txhim khu kev qha dua.

Beidou Tiam II

Beidou Tiam II, lub kaw lus tiam ob ntawm Beidou Navigation Satellite System (BDS), yog lub kaw lus navigation satellite thoob ntiaj teb uas Tuam Tshoj tsim tawm ywj pheej. Tsim los ntawm lub hauv paus ntawm Beidou Tiam I, nws lub hom phiaj yog muab kev pabcuam qhov chaw, kev taw qhia, thiab lub sijhawm (PNT) uas muaj kev ntseeg siab, siab rau cov neeg siv thoob ntiaj teb. Lub kaw lus muaj peb ntu: qhov chaw, hauv av, thiab tus neeg siv. Ntu chaw suav nrog ntau lub satellites navigation, ntu hauv av suav nrog cov chaw tswj hwm tseem ceeb, cov chaw saib xyuas, thiab cov chaw txuas, thaum ntu neeg siv suav nrog ntau yam khoom siv txais.
Qhov kev faib tawm zaus ntawm Beidou Generation II feem ntau suav nrog peb txoj kab: B1, B2, thiab B3, nrog rau cov kev cai tshwj xeeb raws li nram no:
a) B1 Band: Ntau zaus ntawm 1561.098MHz ± 2.046MHz, feem ntau yog siv rau kev tsav tsheb pej xeem thiab kev pabcuam nrhiav chaw.
b) B2 Band: Ntau zaus ntawm 1207.52MHz ± 2.046MHz, kuj tseem siv rau cov kev pabcuam pej xeem, ua haujlwm ua ke nrog B1 band los muab ob-zaus qhov chaw muaj peev xwm rau kev txhim kho qhov tseeb.
c) B3 Band: Ntau zaus ntawm 1268.52MHz ± 10.23MHz, feem ntau yog siv rau kev ua tub rog, muab qhov tseeb ntawm qhov chaw thiab kev cuam tshuam.

Beidou Tiam III

Lub Beidou Navigation System tiam thib peb, tseem hu ua Beidou-3 Global Navigation Satellite System, yog lub satellite navigation system uas siv tau thoob ntiaj teb uas Tuam Tshoj tsim thiab ua haujlwm ywj pheej. Nws tau ua tiav kev dhia los ntawm thaj tsam mus rau thoob ntiaj teb, muab kev pabcuam qhov chaw, kev taw qhia, thiab lub sijhawm rau cov neeg siv thoob ntiaj teb. Beidou-3 muab ntau lub teeb liab qhib kev pabcuam thoob plaws B1, B2, thiab B3 bands, suav nrog B1I, B1C, B2a, B2b, thiab B3I. Cov zaus faib ntawm cov teeb liab no yog raws li nram no:
a) B1 Band: B1I: ​​Qhov nruab nrab zaus ntawm 1561.098MHz ± 2.046MHz, lub teeb liab yooj yim siv dav hauv ntau yam khoom siv navigation; B1C: Qhov nruab nrab zaus ntawm 1575.420MHz ± 16MHz, lub teeb liab tseem ceeb txhawb nqa Beidou-3 M/I satellites thiab txhawb nqa los ntawm cov tshiab, high-end mobile terminals.
b) B2 Band: B2a: Qhov zaus nruab nrab ntawm 1176.450MHz ± 10.23MHz, kuj yog lub teeb liab tseem ceeb uas txhawb nqa Beidou-3 M/I satellites thiab muaj nyob rau ntawm cov xov tooj ntawm tes tshiab dua, siab heev; B2b: Qhov zaus nruab nrab ntawm 1207.140MHz ± 10.23MHz, txhawb nqa Beidou-3 M/I satellites tab sis tsuas yog muaj nyob rau ntawm qee lub xov tooj ntawm tes siab heev.
c) B3 Band: B3I: Qhov nruab nrab zaus ntawm 1268.520MHz ± 10.23MHz, txhawb nqa los ntawm txhua lub satellites hauv ob qho tib si Beidou Generation II thiab III, nrog kev txhawb nqa zoo heev los ntawm ntau hom, ntau zaus modules.

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