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
Simulations and ResultsInter Satellite Links6.1.1.5 Pure LEO ConstellationThe next constellation is a pure 1250 km LEO constellation, with a total of 81 S/V at 9 orbitplanes with 1 pattern unit phase difference between adjacent planes. All orbit planes have a55° inclination. The following picture shows the ground tracks of the satellites, as well as thelocations of the DORIS network.Figure 6-9 Ground Tracks of LEO ConstellationThe next picture shows the earth coverage of such a constellation. Due to the low orbitaltitude navigation service can be provided only up to ~ 65 ° North / South.Page 100R. Wolf
Inter Satellite LinksSimulations and ResultsFigure 6-10 Visibility of LEO ConstellationIt is clear that building a navigation constellation using satellites at low Earth orbits wouldrequire a large number of space crafts. This constellation here with 81 space vehicles can beregarded as the minimum.6.1.1.6 GEO / LEOTo overcome the bad global coverage of a pure LEO constellation, the next constellationintroduces some high altitude satellites in addition to the LEOs. The LEO part is a 72 / 8 / 2Walker constellation with an orbit altitude of 1250 km and 55° inclination. In addition, thereare 9 GEOs, evenly spaced by 40 °, starting at 10°E. The following picture shows groundtracks and S/V positions, as well as the station locations of the DORIS network.R. Wolf Page 101
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<strong>Inter</strong> <strong>Satellite</strong> <strong>Links</strong>Simulations <strong>and</strong> ResultsFigure 6-10 Visibility of LEO ConstellationIt is clear that building a navigation constellation <strong>using</strong> satellites at low Earth orbits wouldrequire a large number of space crafts. This constellation here with 81 space vehicles can beregarded as the minimum.6.1.1.6 GEO / LEOTo overcome the bad global coverage of a pure LEO constellation, the next constellationintroduces some high altitude satellites in addition to the LEOs. The LEO part is a 72 / 8 / 2Walker constellation with an orbit altitude of 1250 km <strong>and</strong> 55° inclination. In addition, thereare 9 GEOs, evenly spaced by 40 °, starting at 10°E. The following picture shows groundtracks <strong>and</strong> S/V positions, as well as the station locations of the DORIS network.R. Wolf Page 101
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