Improvement and Simulation of an Autonomous Time Synchronization Algorithm for a Layered Satellite Constellation

<table class="table-group" width="800px"><tr class="fig-image" id="a"><td><img alt="136301.fig.004a" src="https://static.hindawi.com/articles/mpe/volume-2013/136301/figures/136301.fig.004a.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(a) </b>Fitting results of a 10-minute time synchronization from 23:32:50.000 on June 1, 2008 to 23:42:50.000 on June 1, 2008</td></tr></table></td></tr><tr class="fig-image" id="b"><td><img alt="136301.fig.004b" src="https://static.hindawi.com/articles/mpe/volume-2013/136301/figures/136301.fig.004b.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(b) </b>Fitting results of a 20-minute time synchronization from 23:27:50.000 on June 1, 2008 to 23:47:50.000 on June 1, 2008</td></tr></table></td></tr><tr class="fig-image" id="c"><td><img alt="136301.fig.004c" src="https://static.hindawi.com/articles/mpe/volume-2013/136301/figures/136301.fig.004c.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(c) </b>Fitting results of a 30-minute time synchronization from 23:22:50.000 on June 1, 2008 to 23:52:50.000 on June 1, 2008</td></tr></table></td></tr><tr class="fig-image" id="d"><td><img alt="136301.fig.004d" src="https://static.hindawi.com/articles/mpe/volume-2013/136301/figures/136301.fig.004d.jpg"/></td></tr><tr class="fig-caption"><td align="center"><table><tr><td><b>(d) </b>Fitting results of a 20-minute time synchronization from 23:22:50.000 on June 1, 2008 to 23:42:50.000 on June 1, 2008 (asymmetrical)</td></tr></table></td></tr></table>

<table>Fitting curves of pseudorange and clock offset between GEO and MEO satellites.</table>

Mathematical Problems in Engineering

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Figure 4

Figure 4: Improvement and Simulation of an Autonomous Time Synchronization Algorithm for a Layered Satellite Constellation 