Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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Orbit ComputationInter Satellite Links0.20.0-0.2Orbit Error [m]-0.4-0.6-0.8-1.0-1.2RadialAlong TrackCross Track-1.419:12:30.000 01:52:30.000 08:32:30.000UTC [hours:minutes:seconds]Figure 4-11 Orbit Error of MEO neglecting Solid Earth TidesThe following table indicates the resulting orbit errors (RMS), depending on the orbit typeand prediction interval.Radial [m] Along Track [m] Cross Track [m]500 km LEO 0.24 22 0.9800 km LEO 0.23 20.5 0.821250 km LEO 0.24 16.3 0.47MEO 0.07 0.75 0.02GEO 0.04 0.27 0.01IGSO 0.04 0.25 0.01Table 4-16 Solid Earth Tide Perturbation after 1 dayPage 56R. Wolf
Inter Satellite LinksOrbit ComputationAs can be seen from the table above, the error contribution is negligible for MEO, GEO andIGSO orbits, but not for LEO orbits. In fact, for precise orbit prediction of LEO satellites eventhe ocean tides will have to be evaluated.The attraction of the major planets in our solar system also cause a tidal effect like sun andmoon, but orders of magnitude lower. Figure 4-12 shows the prediction error for an IGSOneglecting the attraction of the major planets over one week.0.060.040.02Orbit Error [m]0.00-0.02-0.04-0.06-0.08-0.10RadialAlong TrackCross Track0 2 4 6 8Time [days]Figure 4-12 Prediction Error of IGSO neglecting Major Planets AttractionTable 4-17 summarises the effect on different orbits after one week of prediction. It is clearthat this perturbation can be neglected for earth orbiting satellites. They become moreessential if interplanetary trajectories are to be considered. But this is far from the scope ofthis text focussing on (earth) navigation satellites.R. Wolf Page 57
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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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Simulations and ResultsInter Satell
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Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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