Precise Orbit Determination of Global Navigation Satellite System of ...

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Chapter 9 Software and Simulation Results Comparing Figure 9-21 and Figure 9-25 with Figure 9-30 and Figure 9-31, it can be found that the float ambiguity solution in Figure 9-30 (considering the satellite visibility) is not as good as that in Figure 9-27. When the tracking station looses the signal from the satellite, in the software GEOKAL, the initial ambiguity will be set to zero; when the signal is re-locked, the ambiguities are solved again. The same true ambiguities will be set before and after observation interruption. This is the reason why Figure 9-30 looks like a bar graph. Figure 9-32 shows the accuracy of dynamic orbit determination of IGSO satellite at λ=-10° using carrier phase observation considering the satellite visibility. Difference (meter) 10 8 6 4 2 0 -2 -4 -6 -8 -10 0 24 48 72 96 120 144 168 192 216 240 Tim e (hour) Figure 9-32 Accuracy of dynamic Orbit Determination of a IGSO Satellite at λ=-10° with Float Ambiguity Solution The accuracies of x, y, z coordinates of dynamic orbit determination with float ambiguity solution are ±0.32 m, ±0.34 m and ±0.17 m respectively. The results of other satellites are as follows. Ambiguity 21 20.8 20.6 20.4 20.2 20 19.8 19.6 19.4 19.2 19 0 24 48 72 96 120 144 168 192 216 240 Tim e (hour) Figure 9-33 Float Ambiguity Solution of a IGSO Satellite at λ =20° at Tracking Station 1 128 dx dy dz
Chapter 9 Software and Simulation Results Ambiguity Difference (meter) 101 100.8 100.6 100.4 100.2 100 99.8 99.6 99.4 99.2 99 10 8 6 4 2 0 -2 -4 -6 -8 -10 0 24 48 72 96 120 144 168 192 216 240 Tim e (hour) Figure 9-34 Float Ambiguity Solution of a IGSO Satellite at λ =20° at Tracking Station 5 0 24 48 72 96 120 144 168 192 216 240 Tim e (hour) Figure 9-35 Accuracy of Dynamic Orbit Determination of a IGSO Satellite at λ=20° with Float Ambiguity Solution Ambiguity 21 20.8 20.6 20.4 20.2 20 19.8 19.6 19.4 19.2 19 0 24 48 72 96 120 144 168 192 216 240 Time (hour) Figure 9-36 Float Ambiguity Solution of a IGSO Satellite at λ=60° at Tracking Station 1 129 dx dy dz
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PRECISE ORBIT DETERMINATION OF GLOB
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Summary GNSS-2 (Global Navigation S
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3.2.2.1 Principle..................
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9.3.3 The Effect of Distribution of
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Chapter 1 Introduction 1.2 Developm
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Chapter 2 Observations of Orbit Det
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Chapter 3 Orbit Tracking System and
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Chapter 4 Major Error Sources of Sa
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Chapter 5 Perturbation Models of IG
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Chapter 6 Algorithms of Orbit Deter
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Page 86 and 87: Chapter 6 Algorithms of Orbit Deter
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Page 104 and 105: Chapter 8 Geostationary Orbit Deter
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Page 154 and 155: References Carpino M. (1995): SAEG
Page 156 and 157: References Klobuchar, J. A.(1996):
Page 158 and 159: References Traquilla, J. M. and J.
Page 160 and 161: Acknowledgments 152
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Precise Orbit Determination of Global Navigation Satellite System of ...

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