A three-dimensional matrix method is proposed in this paper for Global Navigation Satellite System (GNSS) constellation\nIntrasatellite Link (ISL) topological design.Therows and columns of proposedmatrix contain the information of both constellation\norbit planes and satellites in each orbit plane. The third dimension of proposed matrix represents the time sequences during\nconstellation movement. The proposed method has virtues of better advantage of conceptual clarity and computational efficiency,\nmeanwhile, some properties of ISLs in the constellation can be proved easily. At the second part of this paper, a link assignment\nand optimal routing problem is proposed using three-dimensional topology matrixes, which aimed to minimize the relay hops\nduring the process of data uploading to whole constellation network. Moreover, some practical constrains as antenna beam\ncoverage and relative velocity are considered and analyzed in detail. Finally, some numerical simulations are provided, and the\nresults demonstrated the promising performance of proposed topological method in reduction of computation burden, clear ISL\nconception, and so forth; the efficiency of provided optimal ISL routing problem is also proved.
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