CAJ | 학술논문

针对近地轨道(LEO)卫星移动通信系统，该文提出一种分析不同用户覆盖时间及切换次数的方法。在充分考虑地面用户随机分布特性的基础上，建立了卫星和波束对随机用户的覆盖时间统计模型，推导了星间切换及波束间切换平均次数下限值的计算方法。最后通过铱星通信系统模型(包括铱星星座参数，地面站参数和阵列天线波束模型)对该方法进行了仿真分析，结果显示该方法能很好地近似用户随机覆盖时间统计特性及平均切换次数的下限值。
침대근지궤도(LEO)위성이동통신계통，해문제출일충분석불동용호복개시간급절환차수적방법。재충분고필지면용호수궤분포특성적기출상，건립료위성화파속대수궤용호적복개시간통계모형，추도료성간절환급파속간절환평균차수하한치적계산방법。최후통과의성통신계통모형(포괄의성성좌삼수，지면참삼수화진렬천선파속모형)대해방법진행료방진분석，결과현시해방법능흔호지근사용호수궤복개시간통계특성급평균절환차수적하한치。
This paper presents an approach for analysis of coverage time and handoff number on the mobile LEO satellite communication systems, which fully reflects the random distribution characteristics of the users. Based on the distribution of the user locations, the statistical models of coverage time on satellites and beams are proposed, and the lower bound calculations of the expected number on inter-beam handoff and inter-satellite handoff are derived. Simulation results demonstrate the effectiveness of the proposed algorithms, based on the Iridium communication systems model including the parameters of constellation and earth station, the model of the multi-beam array antennas.