Conclusion

We present L2D2, a novel ground station design for Earth observation satellites. L2D2 is built using a mix of transmit-capable and receive-only geographically-distributed ground stations. L2D2’s geographical diversity along with a new scheduling and rate adaptation algorithm ensure that L2D2 can download data from large constellations of LEO satellites in minutes, as opposed to hours for traditional architectures. While we design L2D2 nodes to be low-complexity low-cost ground stations, we believe the methods presented in this work are applicable more broadly to other distributed ground station designs. Finally, as discussed in 3.4, we hope that this work initiates future work that tackles multiple open research questions towards realizing an agile, robust, and high-performance distributed ground station system.

我们提出了一种名为 L2D2 的、针对对地观测卫星的新型地面站设计。L2D2 由具备发射能力的和只接收的地理分布式地面站混合构建而成。L2D2 的地理分集特性，结合其新颖的调度与速率自适应算法，确保了它能从大型低地球轨道（LEO）卫星星座中下载数据，时间从传统架构的数小时缩短至数分钟。

尽管我们将 L2D2 节点设计为低复杂度、低成本的地面站，但我们相信本文提出的方法对于其他分布式地面站设计也具有更广泛的适用性。最后，如3.4节所讨论的，我们希望这项工作能够启发未来的研究，以解决多个开放性研究问题，最终实现一个敏捷、鲁棒且高性能的分布式地面站系统。