| Citation: | BI Mengge, XU Weilin, HOU Ronghuiet al. An on-demand data transmission mechanism for LEO remote sensing satellite[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(7): 1467-1473. doi: 10.13700/j.bh.1001-5965.2018.0609(in Chinese)
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Aimed at the shortcomings of the existing data downlink mechanisms for low earth orbit (LEO) remote sensing satellite, such as low effiency, high delay and vulnerable transmission path, a new remote sensing data transmission mechanism was proposed. In the proposed mechanism, earth stations were supported to locate remote sensing image resources in real time on demand, and in the process, the transmission path from the positioning satellite to earth station was established. Taking into account the limited visual time between the cooperative satellite and the earth station, when transmission path is established, a routing algorithm was proposed based on the maximization of the path persistent service time to reduce the transmission delay caused by the change of the cooperative satellite. The designed data transmission mechanism was implemented based on the NS3 simulation platform. The experimental results show that the proposed mechanism can reduce the data transmission delay and data loss compared with the existing data transmission mechanism.
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