天线指向不精确时的GMR-1卫星同步

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.

Research on Synchronization Performance of GMR-1 Satellite under Imprecise Antenna Pointing Condition

For synchronization performance under imprecise antenna pointing condition, a satellite mobile communication system is established based on the geostationary orbit mobile radio interface (GMR-1) standard on the OPNET platform, the entire satellite synchronization performance is studied when the downlink antenna points inaccuracy. Its core idea is to complete the inaccuracy antenna pointing impact simulation through the interactive among mobile earth stations and gateway stations, to establish the mathematical model, to analysis and simulate the time synchronization and frequency synchronization performance to achieve the quantitative impact under imprecise antenna pointing condition. Analysis and simulation show that, compared with the satellite that has precise pointing antenna, the imprecise condition has little impact on the time synchronization, however, the frequency synchronization performance is relative to the location of the user, it may reduce the bit error rate performance by 10^-1 to 10^-2.