海事卫星通信系统载波功率控制技术研究

Research of Carrier Power Control Technology in Inmarsat Satellite Communication System

在海事卫星通信中,地球关口站和用户移动终端的载波功率会受到雨衰或天线仰角等条件的影响,载波功率如果出现异常会对通信的质量产生影响,在严重的情况下甚至会导致终端与卫星通信中断;另一方面,终端与终端之间载波信号的功率差异还会互相产生干扰,在卫星通信系统中采用功率控制技术可以有效解决这些问题。该文研究了海事卫星通信系统中的功率控制方法,它可以有效抑制干扰,补偿降雨衰减对卫星通信系统链路的影响。该文还研究了载波信号的功率控制误差对采用其他标准的卫星通信系统容量的影响,通过仿真可以表明,在卫星通信系统中采用精度较高的功率控制方法,可以改善卫星通信系统性能,有效地提高通信质量和容量。

For the Inmarsat satellite communication system, rain attenuation, location or the other environmental fac- tors will affect the carrier power of land earth station. Improper carrier power level will not only degrade the communica tion quality, but also cause the interruption of satellite communication, and the transmission power level difference may cause interference. The power control is an effective way to solve these problems. This paper introduced the power con trol technology of Inmarsat satellite communication system by using this method and it can effectively suppress interfer ence, compensate rainfall attenuation effect on satellite communication link. At the same time, the influence of power control error on system capacity was simulated. The simulation results show that, by using accurate power control tech- nology, the system performance can be improved effectively with accurate power.