Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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Simulations and ResultsInter Satellite Links6.2.8 Galileo 2 (GEO/MEO)6.2.8.1 Ground TrackingThe second option for Galileo shows a slightly higher real time orbit determination accuracy,although using the same network. This is due to the higher inclination of the orbit planesproviding a slightly better observation geometry. Standard deviations and real orbit errors forthe MEO satellites can be taken from the following figure.Radial Error [cm] 1998 07 02 13:11 - 1998 07 13 01:1148.024.0Radial Std. Dev. [cm] 1998 07 02 13:11 - 1998 07 13 01:1134.0017.0-24.0-48.0[h]60 120 180 2400[h]59 118 177 236Along Track Error [cm] 1998 07 02 13:11 - 1998 07 13 01:1176.038.0Along Track Std. Dev. [cm] 1998 07 02 13:11 - 1998 07 13 01:1196.0048.0-38.0-76.0[h]60 120 180 2400[h]59 118 177 236Cross T rack Error [cm] 1998 07 02 13:11 - 1998 07 13 01:1112.06.0Cross Track Std. Dev. [cm] 1998 07 02 13:11 - 1998 07 13 01:1170.0035.0-6.0-12.0[h]60 120 180 2400[h]59 118 177 236Figure 6-36 Tracking Accuracy of MEO using Galileo NetworkThe orbit determination accuracy for the GEO is not as good due to a worse observationgeometry, but still in a reasonable range. Further post processing of the orbit is definitelynecessary.Page 132R. Wolf
Inter Satellite LinksSimulations and ResultsRadial Error [cm] 1998 07 02 13:11 - 1998 07 13 01:1160.030.0Radial Std. Dev. [cm] 1998 07 02 13:11 - 1998 07 13 01:1132.0016.0-30.0-60.0[h]60 120 180 2400[h]59 118 177 236Along Track Error [cm] 1998 07 02 13:11 - 1998 07 13 01:1170.035.0Along Track Std. Dev. [cm] 1998 07 02 13:11 - 1998 07 13 01:1192.0046.0-35.0-70.0[h]60 120 180 2400[h]59 118 177 236Cross T rack Error [cm] 1998 07 02 13:11 - 1998 07 13 01:1116.08.0Cross T rack Std. Dev. [cm] 1998 07 02 13:11 - 1998 07 13 01:1184.0042.0-8.0-16.0[h]60 120 180 2400[h]59 118 177 236Figure 6-37 Tracking Accuracy of GEO using Galileo NetworkR. Wolf Page 133
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Satellite Orbit and EphemerisDeterm
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Inter Satellite LinksAbstractGlobal
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Inter Satellite LinksTable of Conte
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Inter Satellite Links6.2.2 IGSO WAL
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Inter Satellite LinksList of Figure
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Inter Satellite LinksFigure 6-38 Tr
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Inter Satellite LinksList of Tables
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Inter Satellite LinksJ2Earths Oblat
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Inter Satellite LinksIntroduction1
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Inter Satellite LinksIntroductionGE
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Inter Satellite LinksISL Observatio
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Inter Satellite LinksState Estimati
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State EstimationInter Satellite Lin
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Orbit ComputationInter Satellite Li
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Software DescriptionInter Satellite
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Page 98 and 99: Software DescriptionInter Satellite
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Autonomous Onboard ProcessingInter
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Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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