高轨卫星通信星座PS-GERT效能评估模型

卫星通信星座的效能评估不仅可以表征星座的通信能力,还可为优化星座结构提供依据。在深入分析星座结构关系的基础上,剖析基于通信链路的高轨(geostationary earth orbit, GEO)卫星通信网络和联系统(plus system, PS),借助图示评审技术(graphical evaluation and review technique, GERT)提出基于特征函数与传递概率的等价传递函数算法。首先,在分析通信链路重要度内涵的基础上,得出通信链路效能及其重要度的算法公式,构建GEO卫星星座PS-GERT效能评估模型。然后,利用傅里叶逆变换推导星座效能的概率密度函数。最后,以某GEO卫星通信星座为例进行分析,验证了所构建模型的优越性,不仅能够全面客观地评估星座效能,同时也为星座结构的优化奠定了理论基础。

PS-GERT effectiveness evaluation model of GEO satellite communication constellation

The effectiveness evaluation of the satellite communication constellation can not only represent the communication capability of constellation, but also provide the basis for optimizing constellation structure. Based on the deep analysis of the constellation structure, the geostationary earth orbit (GEO) satellite communication network plus system (PS) based on the communication link is analyzed. With the help of the graphical evaluation and review technique (GERT), an equivalent transfer function algorithm based on the characteristic function and transfer probability is proposed. Firstly, on the basis of analyzing the connotation of communication link importance, the algorithm formula of communication link effectiveness and its importance is obtained, and the GEO satellite constellation PS-GERT effectiveness evaluation model is constructed. Then, the probability density function of constellation efficiency is derived by inverse Fourier transform. Finally, the analysis of a GEO satellite communication constellation is taken as an example to verify the superiority of the model constructed. It can not only comprehensively and objectively evaluate the effectiveness of the constellation, but also lay a theoretical foundation for the optimization of the constellation structure.