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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

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References<strong>Inter</strong> <strong>Satellite</strong> <strong>Links</strong>half a revolution, the non-Keplerian GLONASS model has been found superior to the Keplerorbit based GPS model. Based on the GLONASS model, two new user ephemeris models,one with 12, the other with 15 degrees of freedom have been developed <strong>and</strong> found to be aviable option for MEO satellites, exceeding GPS as well as GLONASS models in terms ofmodel fitting error.Development of an onboard integrity monitorA conceptual design for an onboard integrity estimator has been proposed <strong>and</strong> investigatedwith respect to the computational load. The necessary algorithms have been developed,implemented <strong>and</strong> integrated in the ConAn software. The"onboard like" behaviour of thealgorithms has been ensured by1. <strong>using</strong> only information which is available at a satellite2. <strong>using</strong> it only at a time when it becomes available.By simulating several types of non-integrity cases, it shown that the use of just one faultdetection mechanism is likely to be insufficient, because different detectors are triggered bydifferent events. A reasonable combination of fault detection mechanisms, covering differentfault cases, has been presented.Page 192R. Wolf

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