低地球轨道卫星星座地球固定足印模式覆盖域切换方法  

Coverage region switching method under earth-fixed footprint mode for LEO satellite constellation

作　　者：齐晓鑫 宋宝军[1] 李勋 QI Xiaoxin;SONG Baojun;LI Xun(Air Defense and Antimissile School,Air Force Engineering University,Xi’an 710100,China)

机构地区：[1]空军工程大学防空反导学院,陕西西安710100

出　　处：《通信学报》2024年第7期10-20,共11页Journal on Communications

摘　　要：在低地球轨道卫星星座中,当采用地球固定足印模式时,波束在覆盖域之间的切换会影响对地覆盖的仰角,进而影响通信质量。针对地球固定足印模式下的覆盖域切换问题,提出了一种覆盖域切换方法。首先,设计了覆盖域划分机制,使覆盖域拓扑保持规则性;然后,以最大限度地增大波束对地面的最小仰角为目标,设计了切换时刻选择机制和目标覆盖域选择机制。所提方法考虑了极轨星座和倾斜轨星座的差异,同时支持2种星座。以OneWeb和Telesat星座为仿真场景,验证了所提方法。仿真结果表明,所提方法能够有效增大波束对地面覆盖的最小仰角,从而有助于提升链路质量。In low earth orbit(LEO)satellite constellations,when earth-fixed footprint mode is used,the switching of beams between coverage regions affects the elevation angle of the coverage,which in turn affects the communication quality.A coverage region switching method was proposed to address the coverage region switching problem in earth-fixed footprint mode.Firstly,a coverage region division mechanism was designed to keep the coverage region topology regular.Then,a switching time selection mechanism and a target coverage region selection mechanism were designed with the objective of maximizing the minimum elevation angle of the beams.The proposed method takes the differences between polar and inclined orbit constellations into account and supports both constellations.The OneWeb and Telesat constellations are used as simulation scenarios to validate the proposed method.The simulation results show that the proposed method can effectively improve the minimum elevation angle of the beams,which helps to improve the link quality.

关 键 词：低地球轨道卫星星座 地球固定足印 覆盖域 波束切换 

分 类 号：TN92[电子电信—通信与信息系统]