IGSO在卫星移动通信中的应用研究

Study on the application of IGSO into mobile satellite communication

研究利用IGSO星座提供卫星移动通信业务所涉及到的星座覆盖性能、多普勒频移及业务支持能力等问题。研究表明,采用2颗或3颗IGSO卫星构成的星座能够对我国区域提供较好的覆盖性能(单星和多星覆盖率及平均通信仰角),而引入的多普勒频移并不大。链路计算结果表明,采用IGSO卫星能够有效解决GEO卫星在高纬度区域的低仰角问题,并能用比较小的IGSO卫星来达到非常大的GEO卫星才能实现的性能。因此,采用IGSO的区域卫星移动通信系统具有较好的技术可行性。

The related coverage performance, Doppler shift and service-supporting capability of the IGSO constellation was studied for the given area. The results show that, the constellation, which consists of two or three IGSO satellites, can achieve good coverage characteristics （the percent of time of one and more satellites coverage and average elevation angle） to the Chinese and nearby area with small Doppler shift. The link budget shows that, adopting IGSO can effectively solve the low elevation angle problem faced by GEO satellite, and similar performance, which can only be implemented by a very big GEO satellite, can be achieved by two or three relatively small IGSO satellites. So the solution of adopting IGSO to provide mobile satellite communication system is technically feasible.