Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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Simulations and ResultsInter Satellite Links6.2.7 Galileo 1 (Pure MEO)6.2.7.1 Ground TrackingIn this scenario only ground links are processed for orbit determination. The constellation istracked by the full proposed ground network. The achieved accuracy can be seen in the figureshown below.Radial Error [cm] 1998 07 02 12:36 - 1998 07 12 18:3650.025.0Radial Std. Dev. [cm] 1998 07 02 12:36 - 1998 07 12 18:3634.0017.0-25.0-50.0[h]59 118 177 2360[h]57 114 171 228Along Track Error [cm] 1998 07 02 12:36 - 1998 07 12 18:3692.046.0Along Track Std. Dev. [cm] 1998 07 02 12:36 - 1998 07 12 18:36110.0055.0-46.0-92.0[h]59 118 177 2360[h]57 114 171 228Cross T rack Error [cm] 1998 07 02 12:36 - 1998 07 12 18:3624.012.0Cross T rack Std. Dev. [cm] 1998 07 02 12:36 - 1998 07 12 18:3688.0044.0-12.0-24.0[h]59 118 177 2360[h]57 114 171 228Figure 6-34 Tracking Accuracy of MEO using Galileo NetworkPage 130R. Wolf
Inter Satellite LinksSimulations and Results6.2.7.2 Ground and Intersatellite TrackingBy adding inter satellite links, tracking accuracy can be improved enormously. Radialaccuracy comes down to 2.5 cm, while along track and cross track accuracy are around 10 cm.This is a degree of accuracy which can normally only be reached by post processing. The realtime accuracy is that good, further smoothing before prediction becomes (nearly) obsolete.Radial Error [cm] 1998 07 01 22:47 - 1998 07 06 10:4712.0Radial Std. Dev. [cm] 1998 07 01 22:47 - 1998 07 06 10:476.02.0-6.001.0-12.0[h]25 50 75 1000[h]25 50 75 100Along Track Error [cm] 1998 07 01 22:47 - 1998 07 06 10:4718.0Along Track Std. Dev. [cm] 1998 07 01 22:47 - 1998 07 06 10:479.08.0-9.004.0-18.0[h]25 50 75 1000[h]25 50 75 100Cross Track Error [cm] 1998 07 01 22:47 - 1998 07 06 10:4720.0Cross T rack Std. Dev. [cm] 1998 07 01 22:47 - 1998 07 06 10:4710.010.0-10.005.0-20.0[h]25 50 75 1000[h]25 50 75 100Figure 6-35 Tracking Accuracy of MEO all available ISL'sR. Wolf Page 131
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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 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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Autonomous Onboard ProcessingInter
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ReferencesInter Satellite Linksinte
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Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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