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构建空天地海一体化网络是6G的愿景之一，也是实现“万物智联”的重要手段。卫星通信具备全球覆盖、广域连接能力，是未来空天地海一体化网络的关键要素。首先，讨论空天地海一体化网络的基本架构和发展现状，介绍面向空天地海一体化网络的卫星通信技术；然后，分析空天地海一体化网络场景下卫星通信的若干关键技术，包括体系架构、空中接口、资源调度、网络切片和组网管理等技术；最后，讨论空天地海一体化发展趋势下，卫星通信面临的挑战及其发展前景。

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In order to solve the huge calculation problem in conventional cross ambiguity function (CAF) algorithm for TDOA/FDOA estimation, this paper proposed a fast algorithm using short-time CAF based on coherent accumulation and approximate calculation. From the definition of CAF. the proposed algorithm cut the CAF function into short and coherent CAFs using phase correction factor, and then made approximate calculation in each short CAF. Compared with conventional CAF algorithm . the proposed algorithm reduces the computation time both from the short CAFs and the approximate calculation. It compared conventional CAF algorithm and the proposed algorithm under the same environment. Simulation results show the effectiveness of the proposed algorithm. It can cut down the time consumption around 90%. [ABSTRACT FROM AUTHOR]