Abstract
The satellite constellation design for Disaster Emergency Communication Network (DECN) can strengthen the coverage of incomplete terrestrial network in disaster-stricken area. In this paper, a capacity-oriented satellite constellation is designed with multiple optimization indicators via evaluating the capacity value precisely. Firstly, a DECN model is constructed, and the coverage performance for single satellite is analyzed. Then, the user capacity is defined to indicate the number of users requesting satellite communication, likewise, the satellite capacity is defined to describe the number of serviceable users. Following that, the problem of satellite constellation design in DECN is formulated to maximize satellite capacity and multiple-coverage, and minimize constellation cost. In view of the formulated problem, a capacity-oriented satellite constellation design is implemented with a multi-objective genetic algorithm suited for the disaster-stricken area. Simulation results show that the designed satellite constellations can meet the capacity demand with lower cost, and simultaneously satisfy the coverage requirements in terms of coverage rate, multiple coverage, and average coverage for the target area.
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