Abstract

The appropriate high-accuracy time and frequency standard is basic to normal operation of various kinds of aerospace application systems, which influences systems performance. The study of establishing suitable time and frequency standard and intersatellite performance analysis in aerospace is very important. Based on the establishment of aerospace satellite visual model, the simulation of satellite visual time on 3-layer satellite networks, including GEO satellite (Geostationary Earth Orbit), IGSO (Inclined Geosynchronous Orbit) satellites and MEO (Medium Earth Orbit) satellites, has been conducted. The visual features of this satellite network have been gained. Combining with the major influencing factors of satellite clock correction error, aerospace time synchronization architecture on the basis of layering has been proposed. Furthermore, intersatellite links performance analysis is the basis for establishing aerospace layering time synchronization architecture. The 3-layer satellite networks is used as an example to simulate the variation range of distance interlayer satellites of the 3-layer satellite networks and to analyze the performance of GEO-IGSO, GEO-MEO and IGSO-MEO links in S-band and Ka-band under the preset intersatellite transmission system, link parameters, transmission loss and without regard to the error of the intersatellite pointing accuracy. The results show that at the maximum intersatellite distance, if the S-band transmission rate is in excess of 2 Mbps, when the antenna is 1 m in diameter, the transmitting power needed is about 50 W. In the Ka-band, 1m antennas only need 1 W transmitting power to provide an intersatellite data transmission rate higher than 2 Mbps. The Ka-band is more favorable for improving the performance of intersatellite links of 3-layer satellite networks. Research results serves as reference for the establishment of aerospace layering time synchronization architecture based on 3-layer satellite networks.

Keywords:

Intersatellite communication, links performance analysis, satellite networks, time synchronization architecture,

References

Competing interests

The authors have no competing interests.

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The authors have no competing interests.