GPS Almanac Txhais
Yog hais tias koj twb tau wondered vim li cas koj tus receiver GPS tej zaum yuav siv sij hawm ib pliag kom npaj mus next tom qab nws tau qhib, nws yog vim nws yuav tsum tau txais qee cov ntaub ntawv yooj yim ntxiv rau capturing GPS satellite signals.
Koj tuaj yeem ntsib kev pib qeeb yog tias koj lub GPS tsis siv rau hnub lossis lub asthiv, lossis tau raug thauj mus rau ib qho tseem ceeb thaum muab tua. Nyob rau hauv no, GPS yuav tsum tau hloov nws cov ntaub ntawv almanac thiab ephemeris thiab muab cia rau hauv nco.
Laus GPS kho vaj tse uas tsis muaj ib qho kev sib tw, siv sijhawm ntev dua rau "khau raj" thiab ua zoo siv vim tias nws tau ua ib qho kev tshawb nrhiav satellite ntev. Txawm li cas los xij, cov txheej txheem no muaj kev ceev nrooj dua tshiab txawm hais tias lawv tsis muaj almanac.
Tag nrho lub sij hawm nws yuav siv sij hawm los sau cov xov xwm hauv GPS no hu ua TTFF, uas txhais tau hais tias Lub Sij Hawm Mus Ua Ntej , thiab feem ntau yog ntev li 12 feeb ntev.
Dab tsi & # 39; s Muaj nyob rau hauv cov ntaub ntawv Almanac GPS
GPS almanac yog ib txheej ntawm cov ntaub ntawv txhua tus satellite xa mus, thiab nws muaj cov ntaub ntawv hais txog lub xeev (kev mob) ntawm tag nrho GPS satellite constellation thiab coarse cov ntaub ntawv ntawm txhua tus satellite lub orbit.
Thaum lub receiver GPS txais tau cov ntaub ntawv tam sim no almanac nco, nws tuaj yeem tau txais cov xov xa tawm satellite thiab txiav txim siab thawj txoj haujlwm sai dua.
Lub GPS almanac kuj muaj xws li GPS moos calibration cov ntaub ntawv thiab cov ntaub ntawv los pab kho rau distortion los ntawm ionosphere.
Koj tuaj yeem tau txais cov ntaub ntawv almanac los ntawm ALM, AL3, thiab TXT cov ntaub ntawv los ntawm Tebchaws Asmeskas Cov Tub Rog Kev Nkag ntawm Navigation Center qhov website.