本文从卫星通信的特性出发 ,针对其带限和非线性的信道特性 ,提出了各种PSK调制方式 ,这类调制方式是利用已调信号包络恒定、频谱占有率低以及经由非线性信道而产生的频谱扩展和频率失真小等特点 ,使卫星通信的已调信号和特殊信道达到良好的匹配。本文还对相干载波提取中的锁相环提出了一种改进方法。 In this paper, based on the characteristics of satellite communication, a variety of PSK modulation schemes are proposed for the band-limited and non-linear channel characteristics. These modulation schemes utilize the constant signal envelope, low spectral occupancy, and non-linear channel Resulting in the expansion of the spectrum and frequency distortion and other characteristics of small, so that the satellite communications modulated signals and special channels to achieve a good match. This paper also proposed an improved method for phase-locked loop in coherent carrier extraction.