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
Simulations and ResultsInter Satellite LinksRadial Error [cm] 1998 07 01 20:59 - 1998 07 05 14:59Radial Std. Dev. [cm] 1998 07 01 20:59 - 1998 07 05 14:5914.012.0-14.006.0[h]21 42 63 840[h]22 44 66 88Along Track Error [cm] 1998 07 01 20:59 - 1998 07 05 14:59Along Track Std. Dev. [cm] 1998 07 01 20:59 - 1998 07 05 14:598.040.0-8.0020.0[h]21 42 63 840[h]22 44 66 88Cross Track Error [cm] 1998 07 01 20:59 - 1998 07 05 14:59Cross Track Std. Dev. [cm] 1998 07 01 20:59 - 1998 07 05 14:5917.036.0-17.0018.0[h]21 42 63 840[h]22 44 66 88Figure 6-21 Tracking Accuracy of S/C using ISL's, but not visible to Ground Network(Custom Regional Network)It can be seen that the standard deviations are only twice as high as for the S/C tracked by theground network. The "non-visible" satellites are only positioned relative to the "visible"satellites. This is an interesting option even for non geosynchroneous orbits, because despiteof a regional network, the tracking accuracy is "transferred" to the non-visible satellites viathe inter satellite links.Page 116R. Wolf
Inter Satellite LinksSimulations and Results6.2.3 IGSO on three Loops6.2.3.1 Ground TrackingThis scenario provides nearly as good tracking accuracy as the Walker constellation. Thedifferences result from the higher inclination of the orbits.Radial Error [cm] 1998 07 02 05:59 - 1998 07 09 17:5940.0Radial Std. Dev. [cm] 1998 07 02 05:59 - 1998 07 09 17:5920.040.0-20.0020.0-40.0[h]43 86 129 1720[h]42 84 126 168Along Track Error [cm] 1998 07 02 05:59 - 1998 07 09 17:5952.0Along Track Std. Dev. [cm] 1998 07 02 05:59 - 1998 07 09 17:5926.0118.0-26.0059.0-52.0[h]43 86 129 1720[h]42 84 126 168Cross Track Error [cm] 1998 07 02 05:59 - 1998 07 09 17:5938.0Cross Track Std. Dev. [cm] 1998 07 02 05:59 - 1998 07 09 17:5919.0100.0-19.0050.0-38.0[h]43 86 129 1720[h]42 84 126 168Figure 6-22 Tracking Accuracy of IGSO on a Loop with Custom Global NetworkR. Wolf Page 117
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Simulations <strong>and</strong> Results<strong>Inter</strong> <strong>Satellite</strong> <strong>Links</strong>Radial Error [cm] 1998 07 01 20:59 - 1998 07 05 14:59Radial Std. Dev. [cm] 1998 07 01 20:59 - 1998 07 05 14:5914.012.0-14.006.0[h]21 42 63 840[h]22 44 66 88Along Track Error [cm] 1998 07 01 20:59 - 1998 07 05 14:59Along Track Std. Dev. [cm] 1998 07 01 20:59 - 1998 07 05 14:598.040.0-8.0020.0[h]21 42 63 840[h]22 44 66 88Cross Track Error [cm] 1998 07 01 20:59 - 1998 07 05 14:59Cross Track Std. Dev. [cm] 1998 07 01 20:59 - 1998 07 05 14:5917.036.0-17.0018.0[h]21 42 63 840[h]22 44 66 88Figure 6-21 Tracking Accuracy of S/C <strong>using</strong> ISL's, but not visible to Ground Network(Custom Regional Network)It can be seen that the st<strong>and</strong>ard deviations are only twice as high as for the S/C tracked by theground network. The "non-visible" satellites are only positioned relative to the "visible"satellites. This is an interesting option even for non geosynchroneous orbits, because despiteof a regional network, the tracking accuracy is "transferred" to the non-visible satellites viathe inter satellite links.Page 116R. Wolf
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