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GPS Observations and data-processing . Sat07_81, 2007-10-23 .

GPS Observations and data-processing . Sat07_81.ppt, 2007-10-23. Observations: Pseudo-ranges from P-code obs. Pseudo-range differences from Doppler shift Carrier-wave phases or phase-differences Travel-time differences from interferometric measurements.

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GPS Observations and data-processing . Sat07_81, 2007-10-23 .

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  1. GPS Observations and data-processing. Sat07_81.ppt, 2007-10-23. Observations: • Pseudo-ranges from P-code obs. • Pseudo-range differences from Doppler shift • Carrier-wave phases or phase-differences • Travel-time differences from interferometric measurements

  2. GPSPhases. Sat07_81.ppt, 2007-10-23. .

  3. GPS Carrier (CR)-phases. Sat07_81.ppt, 2007-10-23. .

  4. GPS Code and Carrier Phases. Sat07_81.ppt, 2007-10-23. T is the satellite time t is the receiver (RCV) time t as subscript: transmitted signal r as subscript: received signal fCD= code-frequency fCR=carrier frequency Then Code: ΦCD(Tt)=TtSVfCD Carrier: ΦCR(Tt)=TtSVfCR

  5. GPS Code and Phase. Sat07_81.ppt, 2007-10-23. -

  6. GPS. Sat07_81.ppt, 2007-10-23. n

  7. GPS. Pseudo-range. Sat07_81.ppt, 2007-10-23. .

  8. GPS Phase. Sat07_81.ppt, 2007-10-23. .

  9. GPS Data differencing. Sat07_81.ppt, 2007-10-23. Using linear combinations, it is possible to eliminate various terms: Differences: between different stations satellites epochs However: noise increases ! Notation: i,j receivers (sub-scripts), p, q, satellites (super-scripts) t1, t2 epochs at position 1 and 2 of p. q. Pseudo ragnes: PRp1i (example)

  10. GPS Observations. Sat07_81.ppt, 2007-10-23.

  11. Single differences, two receivers. Sat07_81.ppt, 2007-10-23.

  12. Double-differences. Sat07_81.ppt, 2007-10-23.

  13. Triple and other differences. Sat07_81.ppt, 2007-10-23.

  14. GPS Linear combinations. Sat07_81.ppt, 2007-10-23.

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