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由于卫星和通信终端之间的相对运动,卫星移动通信系统中信号传播过程中会引入多普勒频移和传播时延,这些均要求系统必须能够快速实现同步。文章介绍了一种适用于卫星移动通信系统的,基于双Chirp的信号检测和同步方案。计算机仿真结果表明该方案能够迅速、准确地实现信号检测并估计出信号中的多普勒频移和传播时延,实现系统的快速同步,且工作门限较低。
Because of the relative motion between satellites and communication terminals, Doppler shift and propagation delays are introduced in the signal propagation in satellite mobile communication systems, all of which require that the system must be able to quickly achieve synchronization. This paper introduces a dual Chirp signal detection and synchronization scheme suitable for satellite mobile communication system. Computer simulation results show that the proposed scheme can detect signals quickly and accurately and estimate the Doppler frequency shift and propagation delay in the signal, and achieve fast synchronization of the system with low working threshold.