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GPS

This text delves into the intricacies of satellite navigation systems, exploring the principles behind GPS, GLONASS, GALILEO, and GNSS. Learn about orbital dynamics, signal redundancy, and practical calculations. Understand satellite-receiver travel time, light speed, and precision positioning. Unravel the complexities of static and dynamic cases, synchronization, and cycle-slips. Discover how to optimize satellite observations for accurate positioning solutions.

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GPS

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  1. GPS

  2. Terza legge di Keplero T a luna ~400000km ~29giorni satelliti geostazionari ~42000km 23h56’ (giorno sidereo) satelliti GPS ~26000km 11h58’ satelliti per telerilevamento ~7000km ~1h1/2

  3. GNSS – Global Navigation Satellite System • GPS – Global Positioning System (USA) • GLONASS (Russia) • GALILEO (Unione Europea)

  4. tempo di percorrenza satellite-ricevitore cvelocità della luce

  5. Calcolo della ridondanza • si osservano n satelliti • si fanno m acquisizioni osservazioni

  6. Calcolo della ridondanza Incognite: caso statico 3 coordinate m sincronizzazioni (1 per ogni istante di acquisizione) n incognite numero intero di cicli

  7. si considerano come (pseudo)-osservabili differenze di distanze 1 satellite – 2 stazioni 1 stazione – 2 satelliti

  8. in caso di cycle-slip in uno dei segnali se non c’è cycle-slip fra in caso di cycle-slip presenta

  9. Stazione permanente PIN Prato - Antenna

  10. Frame

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