Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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Simulations and ResultsInter Satellite Links6.2.2 IGSO Walker Constellation6.2.2.1 Ground TrackingThe IGSO Walker constellation is reasonably good tracked by custom global networkproviding 3 – 4 simultaneous ground links. The standard deviation in radial direction isaround 35 cm.Radial Error [cm] 1998 07 02 10:09 - 1998 07 09 22:09118.0Radial Std. Dev. [cm] 1998 07 02 10:09 - 1998 07 09 22:0959.032.0-59.0016.0-118.0[h]39 78 117 1560[h]39 78 117 156Along Track Error [cm] 1998 07 02 10:09 - 1998 07 09 22:09126.0Along Track Std. Dev. [cm] 1998 07 02 10:09 - 1998 07 09 22:0963.098.0-63.0049.0-126.0[h]39 78 117 1560[h]39 78 117 156Cross T rack Error [cm] 1998 07 02 10:09 - 1998 07 09 22:09134.0Cross T rack Std. Dev. [cm] 1998 07 02 10:09 - 1998 07 09 22:0967.0120.0-67.0060.0-134.0[h]39 78 117 1560[h]39 78 117 156Figure 6-19 Tracking Accuracy with Custom Global NetPage 114R. Wolf
Inter Satellite LinksSimulations and Results6.2.2.2 Ground and Inter Satellite TrackingThe tracking accuracy can be remarkably improved by adding intersatellite links. The radialaccuracy increases down to 8 cm and the tangential orbit errors (along track and cross trackerror) are also decreased down to 20 – 25 cm.Radial Error [cm] 1998 07 01 23:59 - 1998 07 06 23:5912.0Radial Std. Dev. [cm] 1998 07 01 23:59 - 1998 07 06 23:596.08.0-6.004.0-12.0[h]26 52 78 1040[h]26 52 78 104Along Track Error [cm] 1998 07 01 23:59 - 1998 07 06 23:5918.0Along Track Std. Dev. [cm] 1998 07 01 23:59 - 1998 07 06 23:599.020.0-9.0010.0-18.0[h]26 52 78 1040[h]26 52 78 104Cross T rack Error [cm] 1998 07 01 23:59 - 1998 07 06 23:5916.0Cross Track Std. Dev. [cm] 1998 07 01 23:59 - 1998 07 06 23:598.022.0-8.0011.0-16.0[h]26 52 78 1040[h]26 52 78 104Figure 6-20 Tracking Accuracy with Custom Global Net using additional ISL's6.2.2.3 Ground and Inter Satellite Tracking with Reduced NetworkIn the introduction it has already be said that intersatellite links can be used to replace groundlikes. This scenario uses the IGSO Walker constellation together with a regional network. Thefollowing figure shows the tracking accuracy for a S/C not visible to ground network at all!R. Wolf Page 115
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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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Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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