Path Formation Time in the Noise-Limited Fractionated Spacecraft Network with FDMA

Path Formation Time in the Noise-Limited Fractionated Spacecraft Network with FDMA
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采用 FDMA 的噪声限制分段航天器网络中的路径形成时间

DOI:
10.1155/2018/9124132
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发表时间:
2018-10
影响因子:
1.4
通讯作者:
胡圣波
胡圣波
中科院分区:
工程技术4区
文献类型:
--
作者:
胡圣波

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连通性和路径形成时间对于分段航天器网络的设计和优化非常重要。以副载波二进制相移键控(BPSK)调制的频分多址(FDMA)为例,重点研究了噪声限制的分段航天器网络渗透的轨道元素约束和路径形成时间问题。首先,基于所提出的分段航天器网络动态拓扑图的演化,证明了噪声限制分段航天器网络渗透的轨道要素的约束条件,给出了路径形成时间的定义并建立了移动性模型。接下来,我们研究首次对接时间与空间初始分布之间的关系以及首次分离时间与空间初始分布之间的关系。这些关系为分段航天器网络中的轨道设计提供了重要基础。最后,数值结果表明,分段航天器的网络拓扑是时变的、动态的。路径形成时间和跳跃长度与每个轨道超周期内的路径长度成线性比例并周期性变化。此外,随着路径形成时间,即路径长度的增加,时间常数逐渐趋于稳定值。这些结果有力地支持了噪声限制的分式航天器网络环境下的渗滤理论。
Connectivity and path formation time are very important for the design and optimization in fractionated spacecraft network. Taking frequency division multiple access (FDMA) with subcarrier binary phase-shift keying (BPSK) modulation as an example, this paper focuses on the issues of constraint to orbital elements and path formation time for the noise-limited fractionated spacecraft network percolating. First, based on the proposed evolution of the dynamic topology graph in the fractionated spacecraft network, we prove the constraint condition of orbital elements for noise-limited fractionated spacecraft network percolating, and the definition of path formation time is provided and the mobility model is established. Next, we study the relationship between first docking time and spatial initial distribution and the relationship between first separating time and spatial initial distribution. These relationships provide an important basis for the orbit design in the fractionated spacecraft network. Finally, the numerical results show that the network topology for fractionated spacecraft is time-varying and dynamic. The path formation time and hop length scale linearly with path length within each orbital hyperperiod and change periodically. Besides, the time constant gradually tends to a stable value with path formation time increasing, that is, path length. These results powerfully support percolation theory further under the environment of the noise-limited fractionated spacecraft network.
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