LEO卫星系统对GSO卫星系统干扰规避技术研究

Research on Interference Avoidance Technology of LEO Satellite Communication System to GSO System

近年,低地轨道(Low Earth Orbit,LEO)卫星星座繁荣发展,LEO卫星系统和地球静止轨道(Geosynchronous Orbit,GSO)卫星系统同频共用情况非常普遍,同频段内LEO卫星系统需要规避GSO卫星系统的上下行干扰。LEO卫星系统对GSO卫星系统干扰规避方法和策略包含调整指向、更改频率、降低功率和关闭波束。在对系统干扰规避模式及干扰区域情况进行仿真基础上,结合LEO卫星系统特点,提出经过规避区域时切换信关站或者馈电链路关闭下行波束的方案。用户链路结合相控阵天线特点,信令波束通过上注星载相控阵天线波位表实现干扰规避;业务波束通过上注干扰规避区域对应的地面网格编码实现干扰规避,提出不同链路干扰规避实施方案和实现流程。

In recent years,the prosperity and development of Low Earth Orbit(LEO)satellite constellation makes it common for LEO satellite system and Geosynchronous Orbit(GSO)satellite system to share the same frequency.LEO satellite system within the same frequency band needs to avoid uplink and downlink interference to GSO satellite system.The methods and strategies to avoid the interference LEO satellite system to GSO satellite interference include adjusting direction,changing frequency,reducing power,and closing beams.On the basis of simulating the interference avoidance mode and interference zone of the system,combined with the characteristics of LEO satellite system,a scheme is proposed to switch the gateway station or turn off the beam when the feed link and the ground gateway pass through the avoidance zone.The user link combines the characteristics of phased array antennas,and the signaling beam achieves interference avoidance by injecting the space borne phased array antenna wave position table.The traffic beam achieves interference avoidance by encoding the ground grid corresponding to the interference avoidance area through injection.Different implementation plans and implementation processes for link interference avoidance are proposed.The research results provide strong technical support for the design and construction of LEO satellite constellation system.