针对卫星天线指向不精确时信息传输的同步性能,在OPNET仿真平台上基于对地静止轨道无线接口(GMR-1)标准建立卫星移动通信模型,研究天线指向不精确时的卫星移动通信系统同步性能.其核心思想是通过移动式地面站和信关站之间的互动来完成影响的仿真,即建立天线指向不精确时的频率与定时同步数学模型,分析频率和定时同步性能的统计特性,得出天线指向不精确时对同步性能带来的定量影响,并进行仿真.理论分析和仿真结果表明,与指向精准的卫星天线相比,天线指向不精确时对卫星系统的定时同步影响较小,而频率同步的性能与用户位置有关,受频率同步影响的误码率性能下降约为10-1~10-2数量级. Aiming at the synchronization performance of information transmission when the satellite antenna is pointing inaccurately, a satellite mobile communication model is established on the OPNET simulation platform based on the geostationary orbit radio interface (GMR-1) standard to study the synchronization performance of the satellite mobile communication system when the antenna is imprecise The core idea is to complete the simulation of the impact through the interaction between the mobile ground station and the gateway station, that is, to establish the mathematical model of the frequency and timing synchronization when the antenna points inaccurately and to analyze the statistical characteristics of the frequency and timing synchronization performance. When the antenna is inaccurate, the quantitative impact on the synchronization performance is simulated and simulated.Theoretical analysis and simulation results show that compared with the precise pointing satellite antenna, the timing synchronization of the satellite system is less affected when the antenna pointing is inaccurate, The performance of frequency synchronization is related to the location of users. The performance of bit error rate affected by frequency synchronization is reduced by about 10-1-10-2.