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Tehnologia GPS

Tehnologia GPS. Dr. Florian Bodescu. Universitatea din Bucureşti CESEC. Scop. Localizare spatiala si navigare Departmentul de Aparare (DoD) al U.S. a decis ca au nevoie de un sistem precis de pozitionare globala

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Tehnologia GPS

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  1. Tehnologia GPS Dr. Florian Bodescu Universitatea din Bucureşti CESEC

  2. Scop • Localizare spatiala si navigare • Departmentul de Aparare (DoD) al U.S. a decis ca au nevoie de un sistem precis de pozitionare globala • Investitie de 12 bilion USD in dezvoltarea sistemului de pozitionare globala (GPS)

  3. Ce este GPS? • O constelatie de 24 sateliti • GPS Satellites • Name: NAVSTARManufacturer: Rockwell International Altitude: 10,900 nautical miles Weight: 1900 lbs (in orbit)Size: 17 ft with solar panels extended Orbital Period: 12 hours Orbital Plane: 55 degrees to equitorial planePlanned Lifespan: 7.5 years Current constellation: 24 Block II production satellites Future satellites: 21 Block IIrs developed by Martin Marietta • Statii la sol – “control segment” • Hawaii, Ascension Island, Diego Garcia, Kwajalein, and Colorado Springs

  4. Cum functioneaza? • Se masoara distanta de la satelit la receptor masurand timpul necesar semnalului radio sa parcurga distanta • Trilateratie / Triangulatie – geometria triunghiului

  5. Distanta Satelit-Receptor • Viteza luminii – 299790 km/s • Pentru un satelit aflat deasupra capului semnalul parcurge 0.067 s • 20200 km / 299790 km/s = 0.067380 s

  6. Procesul de trilateratie

  7. Categori de aplicatii GPS • Precizie sub centimetrica (Land survey class) • geodezie • cadastru • Precizie submetrica (Mapping class) • Ecologie • Agricultura • Silvicultura • Precizie metrica (Navigation class) • Civil • Militar

  8. Semnalul GPS

  9. Metoda diferentiala

  10. Surse de erori

  11. Erori rezultate din configurare

  12. Servicii GPS • SPS – standard positioning services – utilizeaza semnal GPS degradat intentionat din motive de securitate (SA) • PPS – precise positioning services – serviciu GPS ce permite o acuratete ridicata bazata pe corectie interna a receptorului prin utilizarea unei chei codificate • Ground control station – statii de receptie GPS fixe la sol in vederea sustinerii procesului de corectie diferentiala (post-procesare)

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