Subjects: Geosciences >> Space Physics submitted time 2017-03-10
Abstract：由于卫星网络拓扑的动态性，传统网络的路由协议不再适用于卫星网络。使用文献计 量方法分析了国内外空间卫星网络路由的研究现状，总结归纳为基于虚拟节点的路由协议和基于虚拟拓扑的路由协议，并对 SGRP 路由协议提出了一种改进方法。
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-05-04
Abstract： For deep space communication paths close to the sun causing solar scintillation of radio waves and increasing bit error rate(BER),the approach of choosing the signal bandwidth in the non-frequency selective and slow fading channel with maximum time was proposed.The deep space communication channel model was built based on Rician fading channel model.The statistical characteristics of the amplitude, the coherence time and the coherence bandwidth of the channel were used.The difference among solar scintillation,mobile multipath and ionosphere scintillation was compared. Based on the change of the coherence time and coherence bandwidth with solar elongation angle,the time-selective and frequency-selective characters were determined. Simulation results show that at different little solar elongation angle,especially the small one,the BER of the signal bandwidth chosen by the proposed approach is better than the BER of other signal bandwidth.
Peer Review Status:Awaiting Review
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