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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
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2 GPSPhases. Sat07_81.ppt, 2007-10-23..
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3 GPS Carrier (CR)-phases. Sat07_81.ppt, 2007-10-23..
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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 f CD = code-frequency f CR =carrier frequency Then Code: Φ CD (T t )=T tSV f CD Carrier: Φ CR (T t )=T tSV f CR
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5 GPS Code and Phase. Sat07_81.ppt, 2007-10-23. -
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6 GPS. Sat07_81.ppt, 2007-10-23. n
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7 GPS. Pseudo-range. Sat07_81.ppt, 2007-10-23..
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8 GPS Phase. Sat07_81.ppt, 2007-10-23..
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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) t 1, t 2 epochs at position 1 and 2 of p. q. Pseudo ragnes: PR p 1i (example)
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10 GPS Observations. Sat07_81.ppt, 2007-10-23.
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11 Single differences, two receivers. Sat07_81.ppt, 2007-10-23.
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12 Double-differences. Sat07_81.ppt, 2007-10-23.
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13 Triple and other differences. Sat07_81.ppt, 2007-10-23.
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14 GPS Linear combinations. Sat07_81.ppt, 2007-10-23.
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