With the development of satellite networks, space-air-ground integrated networks, and the Internet of Things, the future giant constellations, high-resolution Earth observation, human-crewed spacecraft, space stations and other space-based information systems have put forward an increasingly urgent demand for large-capacity space networking and information transmission.
The space distributed satellite cluster overcomes the resource constraints and technical bottlenecks of single-satellite platforms by using multiple heterogeneous satellites in the same orbit to cooperate with distributed payloads to achieve large-capacity high-speed networking and information transmission and exchange in space, providing an effective solution for the above-mentioned needs.
The high-speed variation of relative positions of multi-satellites in the same orbit and the visible state constraints of satellite-borne optical phased array antennas cause the of DSC to be dynamically time-varying and intermittent link interruptions. It is necessary to solve the problems of rapid topology reconstruction and dynamic continuous networking under these two situations.
First, the authors give the system model and problem description. It is assumed that the DSC consists of N GEO satellite nodes. Each satellite in the DSC is loaded with two pairs of optical multibeam antennas located on the north and south sides of the satellite, respectively. When antenna k of satellite i and antenna l of satellite j are both mutually visible and meet the bit error rate constraint, it is considered that there is an available link between them.
By analyzing all satellite nodes, the available links of the whole DSC can be obtained, which is denoted as a matrix Lof the antennas carried by each satellite can be obtained, and further the connection matrix TIn the DSC networking process, with network connectivity, network duration, and network connection matrix perturbation as objectives, a multi-objective optimization model for network topology reconstruction and continuous networking is constructed.
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