Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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Simulations and ResultsInter Satellite Links0,060,05URE [m]0,040,030,020,010,002450997,0 2450997,2 2450997,4 2450997,6 2450997,8Julian Date [Days]Figure 6-49 URE with 12 hours smoothing using ISL's6.3.3 Ephemeris Accuracy of ScenariosIn the following section, the achievable accuracy of broadcast ephemeris has beeninvestigated for the different scenarios. To get comparable results, the 15 degree of freedomGLONASS type ephemeris model has been used for all constellations. However, the fitinterval has been adopted to the different orbit types to obtain a “useful” accuracy in terms ofURE. The following table indicates the fit intervals chosen for the different orbit classes:Orbit ClassLEO 1250 kmMEOGEO / IGSOFit Interval15 Minutes2 hours4 hoursInput to the simulations had been the reference orbits and estimated orbits from section 6.2.One has to keep in mind that the propagation of the raw estimate bears some danger: theposition error will not be the same for all “starting position”, because the real error is notconstant but shows a noise / random walk behaviour within the 3 sigma margin (see section6.2). Therefore some of the raw estimates had to be replaced by an artificial introduced smalloffset to obtain the results. However, the numbers derived are representative.Page 148R. Wolf
Inter Satellite LinksSimulations and Results6.3.3.1 Optimized GPSTracking Scenario Mean URE over 24 Hours Worst URE within 24 HoursRaw Estimate Reduced Net 56 cm 82 cmRaw Estimate Full Net 30 cm 42 cmSmoothed Over 12 Hours 3 cm 5 cm6.3.3.2 IGSO Walker ConstellationTracking Scenario Mean URE over 24 Hours Worst URE within 24 HoursRaw Estimate Full Net 103 cm 161 cmRaw Estimate Full Net withISL26 cm 37 cmRaw Estimate Reduced Netwith ISL26 44Smoothed Over 12 Hours 16 cm 25 cm6.3.3.3 IGSO on Three LoopsTracking Scenario Mean URE over 24 Hours Worst URE within 24 HoursRaw Estimate Full Net 41 cm 52 cmRaw Estimate Full Net withISL20 cm 26 cmSmoothed Over 12 Hours 18 cm 22 cm6.3.3.4 GEO / IGSO ConstellationTracking Scenario Mean URE over 24 Hours Worst URE within 24 HoursRaw Estimate Full Net 52 cm 65 cmRaw Estimate Full Net withISLRaw Estimate Regional Netwith ISL14 cm 20 cm20 cm 27 cmSmoothed Over 12 Hours 13 cm 17 cmR. Wolf Page 149
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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 LinksJ2Earths Oblat
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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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Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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