I-TTFF yisikhathi esithatha idivayisi ye-GPS ukuthola indawo yakho
Isikhathi sokuQala sokuQala (i-TTFF) sichaza isikhathi nenqubo edingekayo ukuze idivayisi ye- GPS ithole izibonakaliso ezanele ezisebenzisekayo zesitetjhini nedatha ukunikeza ukuhamba okunembile. Igama elithi "lungisa" lapha lisho ukuthi "isikhundla."
Izimo ezihlukahlukene zingathinta i-TTFF, kufaka phakathi imvelo nokuthi ngabe idivayisi ye-GPS ingaphakathi noma ngaphandle, ngaphandle kokuvinjelwa phakathi kwedivayisi nama-satellites.
I-GPS kufanele ibe nezinethi ezintathu zedatha ngaphambi kokuthi inikeze isikhundla esinembile: izimpawu zesipiliyoni se-GPS, idatha ye- almanac , nedatha ye-ephemeris.
Qaphela: Isikhathi sokuqala sokuQala ngezinye izikhathi siphumelelwe isikhathi sokuphenya .
Imibandela ye-TTFF
Ngokuvamile kunezigaba ezintathu ze-TTFF ihlukaniswe phakathi:
- Ukuqala "okubandayo" noma "factory" kubhekisela esimweni lapho idivayisi ye-GPS kufanele izuze yonke idatha ukuze iqale ukuhamba, njengokungathi idivayisi ingumshayeli noma isanda kufakwa kabusha . I-TTFF ingathatha amaminithi angu-12.
- Ukuqala "okufudumele" noma "okujwayelekile" kusho ukuthi i-GPS inemininingwane eminingi edinga imemori futhi izoqala ngokushesha - ngomzuzu noma ngaphansi. Isiqalo esifudumele senzeke uma idivayisi isusiwe usuku noma ngaphezulu, kodwa hhayi isikhathi eside kangangokuthi idatha yayo isiphelelwe yisikhathi kakhulu.
- "Okushisayo" noma "okulindile" yilapho idivayisi ye-GPS ingathola isignali masinyane njengoba isivele inendawo efanele futhi iqondisa idatha ye-almanac ne-ephemeris. Ngokuvamile idivayisi ivaliwe amahora ambalwa nje. I-TTFF kuleso simo ngezinye izikhathi ibizwa ngokuthi "Isikhathi Sokuqeda Ukulungiswa" (TTSF).
Okuningi ku-TTFF
Uma idivaysi ye-GPS intsha, ivaliwe isikhathi eside, noma ithuthelwe ibanga elide kusukela iqedile ukuguqulwa, kuzothatha isikhathi eside ukuthola lezi zethi yedatha bese uthole Isikhathi sokuQala kuqala. Lokhu kungenxa yokuthi idatha ye-GPS iphelelwe yisikhathi futhi idinga ukulanda ulwazi olusesikhathini.
Abakhiqizi be-GPS basebenzisa amasu ahlukahlukene ukusheshisa i-TTFF, kubandakanya ukulanda nokugcina idatha ye-almanac ne-ephemeris ngexhumano lwenethiwekhi engenazintambo kusuka ku-opharetha weselula esikhundleni se-satellites. Lokhu kuthiwa yi- GPS esiziwe, noma i-GPS.