Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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Inter Satellite LinksFigure 6-7 Ground Tracks of GEO - IGSO Constellation........................................................ 99Figure 6-8 Visibility of GEO – IGSO Constellation................................................................ 99Figure 6-9 Ground Tracks of LEO Constellation................................................................... 100Figure 6-10 Visibility of LEO Constellation.......................................................................... 101Figure 6-11 Ground Tracks of LEO Constellation................................................................. 102Figure 6-12 Visibility of LEO – GEO Constellation ............................................................. 102Figure 6-13 Ground Tracks of Galileo Option 1 Constellation.............................................. 103Figure 6-14 Visibility of Galileo Option 1 Constellation ...................................................... 104Figure 6-15 Ground Tracks of Galileo Option 2 Constellation.............................................. 105Figure 6-16 Visibility of Galileo Option 2 Constellation ...................................................... 105Figure 6-17 Tracking Accuracy with GPS OCS .................................................................... 112Figure 6-18 Tracking Accuracy with proposed Galileo Ground Network............................. 113Figure 6-19 Tracking Accuracy with Custom Global Net ..................................................... 114Figure 6-20 Tracking Accuracy with Custom Global Net using additional ISL's ................. 115Figure 6-21 Tracking Accuracy of S/C using ISL's, but not visible to Ground Network(Custom Regional Network) .......................................................................................... 116Figure 6-22 Tracking Accuracy of IGSO on a Loop with Custom Global Network ............. 117Figure 6-23 Tracking Accuracy of IGSO on a Loop with Custom Global Network usingadditional ISL's............................................................................................................... 118Figure 6-24 Tracking Accuracy of GEO using Ground Links only....................................... 119Figure 6-25 Tracking Accuracy of IGSO using Ground Links only...................................... 120Figure 6-26 Tracking Accuracy of IGSO with ISL's ............................................................. 121Figure 6-27 Tracking Accuracy of GEO with ISL's .............................................................. 122Figure 6-28 Tracking Accuracy of IGSO with rare Ground Contact using ISL's.................. 123Figure 6-29 Tracking Accuracy of GEO without Ground Contact, only via ISL's................ 124Figure 6-30 Tracking Accuracy of LEO using DORIS Network only................................... 125Figure 6-31 Tracking Accuracy of a LEO using Galileo Network ........................................ 126Figure 6-32 Tracking Accuracy of LEO using Ground and Intersatellite Tracking .............. 127Figure 6-33 Tracking Accuracy of LEO using Ground and LEO-GEO-ISL's....................... 129Figure 6-34 Tracking Accuracy of MEO using Galileo Network.......................................... 130Figure 6-35 Tracking Accuracy of MEO all available ISL's ................................................. 131Figure 6-36 Tracking Accuracy of MEO using Galileo Network.......................................... 132Figure 6-37 Tracking Accuracy of GEO using Galileo Network .......................................... 133Page viR. Wolf
Inter Satellite LinksFigure 6-38 Tracking Accuracy of MEO using ISL's.............................................................134Figure 6-39 Tracking Accuracy of GEO using ISL's .............................................................135Figure 6-40 Propagation Error MEO raw estimate ground only 12 states 1 hour .................139Figure 6-41 Ageing of Ephemeris MEO, raw estimate ground only 12 states 1 hour............140Figure 6-42 MEO propagation error with 6 hour smoothing..................................................141Figure 6-43 Ageing of MEO Ephemeris with 6 hours smoothing..........................................142Figure 6-44 MEO Propagation Error with 12 hours of smoothing.........................................143Figure 6-45 URE with 12 hours smoothing............................................................................144Figure 6-46 MEO Propagation Error without smoothing derived from Raw Estimate usingISL's ................................................................................................................................145Figure 6-47 URE without smoothing using ISL's...................................................................146Figure 6-48 MEO Propagation Error with 12 hours smoothing using ISL's ..........................147Figure 6-49 URE with 12 hours smoothing using ISL's.........................................................148Figure 7-1 Block Diagram of Orbit Determination .............................................................155Figure 7-2 Process Flow of the Onboard Integrity Monitor ...................................................167Figure 7-3 Orbit and Clock Degradation of SV 26.................................................................168Figure 7-4 Orbit and Clock Degradation of SV 15.................................................................169Figure 7-5 Orbit and Clock Degradation of SV 10.................................................................170Figure 7-6 User Position Error over Time ..............................................................................171Figure 7-7 User Horizontal Position Error .............................................................................171Figure 7-8 SV 26 Orbit Error due to 2N Thrust / 0.1 m/s Delta V .........................................172Figure 7-9 User Position Error in Horizontal Plane ...............................................................173Figure 7-10 User Position Error over Time ............................................................................173Figure 7-11 Trigger Values for Fault Detector.......................................................................174Figure 7-12 Absolute Orbit Error of SV 26............................................................................175Figure 7-13 Estimated vs. True Error for SV 26 ....................................................................175Figure 7-14 User Error during Manoeuvre .............................................................................178Figure 7-15 Absolute Error SV 26..........................................................................................179Figure 7-16 Estimated vs True Error SV 26 ...........................................................................179Figure 7-17 User Position Error during Manoeuvre...............................................................181Figure 7-18 Absolute Clock Error SV 04 ...............................................................................182Figure 7-19 Estimated vs True Error SV 04 ...........................................................................182Figure 7-20 Absolute Error SV 04..........................................................................................185R. Wolf Page vii
Page 1 and 2: Satellite Orbit and EphemerisDeterm
Page 3 and 4: Inter Satellite LinksAbstractGlobal
Page 5 and 6: Inter Satellite LinksTable of Conte
Page 7 and 8: Inter Satellite Links6.2.2 IGSO WAL
Page 9: Inter Satellite LinksList of Figure
Page 13 and 14: Inter Satellite LinksList of Tables
Page 15 and 16: Inter Satellite LinksJ2Earths Oblat
Page 17 and 18: Inter Satellite LinksIntroduction1
Page 19 and 20: Inter Satellite LinksIntroductionGE
Page 21 and 22: Inter Satellite LinksISL Observatio
Page 23 and 24: Inter Satellite LinksState Estimati
Page 26 and 27: State EstimationInter Satellite Lin
Page 36 and 37: Orbit ComputationInter Satellite Li
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Orbit ComputationInter Satellite Li
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Software DescriptionInter Satellite
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Simulations and ResultsInter Satell
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Autonomous Onboard ProcessingInter
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ReferencesInter Satellite Linksinte
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Satellite Orbit and Ephemeris Determination using Inter Satellite Links

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