Satellite Orbit and Ephemeris Determination using Inter Satellite Links

Autonomous Onboard ProcessingInter Satellite LinksThe event takes place at 12:01:47. Four seconds later, the Chi Square test raises a NO GO,although the true error has not exceeded it's limit yet. The other satellites (as well as the user)immediately exclude the observations to the faulty satellite. In this case, the alarm has to beevaluated not as false alarm, but as a so called early detection. Although the limit has not beenexceeded yet at the time the alarm has been raised, this will however be the case only 15seconds later. Due to the very early alarm, no error in the user position is caused.0,4NorthEastUp0,2Error [m]0,0-0,2-0,4-0,612:02:39.000 12:04:19.000 12:05:59.000Time[hour:min:sec]User ErrorPage 184R. Wolf