Zhangzhou, China
Zhangzhou, China

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Zhang J.,Xian communications Institute | Zhang J.,Army Unit 73132 | Liu J.,Xian communications Institute | Shen P.,Xian communications Institute
Zhongguo Kongjian Kexue Jishu/Chinese Space Science and Technology | Year: 2015

For the satellite constellation network, changes in real-time of network topology and frequently handover of ISL have bad impacts on the routing performance. Based on the backbone-and-accessions theory and the weak connection theory, a new double-layered satellite constellation network structure was proposed, which can help the administration for each layer. Moreover, a new routing algorithm, named EDRA, was proposed. The routing algorithm improves the method of equal-length interval snapshots by adjusting the polar boundary dynamically and adopting the new idea of layered management. The analysis and simulations show that the new satellite constellation network structure is more sensible, the number of snapshots of the EDRA algorithm is only the half of the VLRA algorithm, and the average duration of snapshots is more than three times of the VLRA algorithm. The EDRA algorithm can reduce the number of calculation and updating of the routing, improve the utilization of network ISL, reduce the delay jitter and packet loss rate. ©, 2015, Chinese Academy of Space Technology. All right reserved.


Zhang J.,Xian communications Institute | Zhang J.,Army Unit 73132 | Liu J.,Xian communications Institute | Kang L.,Xian communications Institute | Tian X.,Xian communications Institute
Gaojishu Tongxin/Chinese High Technology Letters | Year: 2014

To avoid geosynchronous earth orbit (GEO) satellite networks' problems of long transmission delay and weak ability in real-time traffic transfering, the design of double-layered satellite networks was studied. Considering that GEO satellites' position relative to the ground is fixed, and low earth orbit (LEO) satellites have the advantages of lower power loss and shorter transmission delay, a simple and efficient double-layered GEO/LEO satellite network was designed according to China's geographical position and demands of future space-based network construction. The design follows the weekness connection theory to make the LEO satellite establish the link with a GEO satellite with the optimum communication quality to guarantee the best communication of the system, and obeys the backbone/access model to make the GEO layer construct the backbone network while the LEO layer construct the access network to overcome the high design difficulty. The simulation results show that the double-layered GEO/LEO satellite network has more advantages in coverage characteristics and the inter satellite link (ISL) geometric characteristics, meeting the reqirements of China's future space-based network construction. ©, 2014, Inst. of Scientific and Technical Information of China. All right reserved.

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