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
Autonomous Onboard ProcessingInter Satellite LinksRadial Error [cm] 1998 07 01 12:47 - 1998 07 02 11:5975.0-75.00[h]4 8 12 16 20Along Track Error [cm] 1998 07 01 12:47 - 1998 07 02 11:59138.0-138.00[h]4 8 12 16 20Cross Track Error [cm] 1998 07 01 12:47 - 1998 07 02 11:59146.0-146.00[h]4 8 12 16 20Clock Error [cm] 1998 07 01 12:47 - 1998 07 02 11:5958.0-58.00[h]4 8 12 16 20Figure 7-5 Orbit and Clock Degradation of SV 10If a user computes the satellite positions using the broadcast parameters, his positioningperformance will degrade due to the degraded orbit and clock parameters. Remember, thebroadcast ephemeris have been derived from a predicted trajectory. In the same way, theclock parameters would have also been derived from prediction. The following figures showthe users positioning error over time, and in the horizontal plane.Page 170R. Wolf
Inter Satellite LinksAutonomous Onboard ProcessingError [m]1614121086420-2-4-6-8-10-12-14-16NorthEastUp18:40:30.000 01:20:30.000 08:00:30.000Time[hour:min:sec]Figure 7-6 User Position Error over Time432North Error [m]10-1-2-3-4-6 -4 -2 0 2 4East Error [m]Figure 7-7 User Horizontal Position ErrorAfter nearly 24 hours, the user position error can be up to 15 meters, mostly due to the SVclock error. However, to overcome the problem in normal system operation, the orbit andR. Wolf Page 171
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Autonomous Onboard Processing<strong>Inter</strong> <strong>Satellite</strong> <strong>Links</strong>Radial Error [cm] 1998 07 01 12:47 - 1998 07 02 11:5975.0-75.00[h]4 8 12 16 20Along Track Error [cm] 1998 07 01 12:47 - 1998 07 02 11:59138.0-138.00[h]4 8 12 16 20Cross Track Error [cm] 1998 07 01 12:47 - 1998 07 02 11:59146.0-146.00[h]4 8 12 16 20Clock Error [cm] 1998 07 01 12:47 - 1998 07 02 11:5958.0-58.00[h]4 8 12 16 20Figure 7-5 <strong>Orbit</strong> <strong>and</strong> Clock Degradation of SV 10If a user computes the satellite positions <strong>using</strong> the broadcast parameters, his positioningperformance will degrade due to the degraded orbit <strong>and</strong> clock parameters. Remember, thebroadcast ephemeris have been derived from a predicted trajectory. In the same way, theclock parameters would have also been derived from prediction. The following figures showthe users positioning error over time, <strong>and</strong> in the horizontal plane.Page 170R. Wolf
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