在卫星通信中,需要快速、高效地对接收信号的位定时和载波初始相位信息进行估计。针对MC-S-ALOHA卫星入路由信号的特点,给出了一种基于前导序列的定时同步和载波同步算法,该算法仅需要一个训练符号,既用于定时恢复,也用于载波频率捕获,额外开销量小,因此,该算法适合于突发模式的MC-S-ALOHA网络传输系统。仿真结果表明,该算法也能快速地实现定时和频率捕获,捕获的频率范围较宽,而且实现结构简单。 In satellite communications, the bit timing of the received signal and the initial phase information of the carrier need to be estimated quickly and efficiently. Aiming at the characteristic of MC-S-ALOHA satellite incoming signal, a timing synchronization and carrier synchronization algorithm based on preamble sequence is proposed. The algorithm needs only one training symbol, which is not only used for timing recovery, but also for carrier frequency acquisition, Therefore, the algorithm is suitable for the burst mode MC-S-ALOHA network transmission system. Simulation results show that the algorithm can also achieve fast timing and frequency capture, capture a wide frequency range, and achieve a simple structure.