Satellite Orbit and Ephemeris Determination using Inter Satellite Links
Satellite Orbit and Ephemeris Determination using Inter Satellite Links
Satellite Orbit and Ephemeris Determination using Inter Satellite Links
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Simulations <strong>and</strong> Results<strong>Inter</strong> <strong>Satellite</strong> <strong>Links</strong>6.2.8 Galileo 2 (GEO/MEO)6.2.8.1 Ground TrackingThe second option for Galileo shows a slightly higher real time orbit determination accuracy,although <strong>using</strong> the same network. This is due to the higher inclination of the orbit planesproviding a slightly better observation geometry. St<strong>and</strong>ard deviations <strong>and</strong> 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 <strong>using</strong> 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
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