本文针对卫星通信系统中常用的非平衡调制技术 ,设计了一种简单的锁相环路 ;首先从理论上分析了该锁相环路的性能 ,然后通过软件仿真证明了环路参数选择的正确性 ,最后将算法在 FPGA上得到了实现。采用本算法的非平衡调制接收机最终达到了设计的性能指标 ,也证明了该锁相环路设计的正确性 In this paper, a simple PLL is designed for the unbalanced modulation technique commonly used in satellite communication systems. Firstly, the performance of the PLL is analyzed theoretically, then the correctness of the loop parameters selection is proved by software simulation Finally, the algorithm is implemented in FPGA. The unbalanced modulation receiver adopting this algorithm finally achieves the designed performance index, and also proves the correctness of the phase-locked loop design