Abstract
A constellation which consists of 120 of satellites with inter-satellite link (ISL) connection is discussed for the Next-generation LEO System (NeLS) project. To maintain continuous ISL connection, the “2π” constellation was selected for the basic NeLS design. This constellation is expressed by using a Walker notation of 120/10/1 with 55 degrees of inclination. However, in evaluating the ISL network performances, we found the ISL structure could be simplified by using constellation parameters of 121/11/0. With these parameters, the ISL network achieved a bi-directional Manhattan Street Network (MSN) structure. The inter-orbital ISL, especially, by using n to n-1 connection where the k-th satellite in the j-th orbital plane is connected to the (k-1)-th satellite in the (j+1)-th orbital plane, achieved a figure-of-eight shaped ring network. This ring network may offer advantages with short connection delay in the north-south direction. We also evaluated sets of constellation parameters that achieved an ISL network with figure-of-eight ring connections. Finally, we discuss the bi-directional MSN topology of the ISL network and combinations of the constellation parameters in this paper.
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