CAJ | 학술논문

为解决低轨道卫星通信系统支持高速飞行的飞机用户无缝接入问题,基于动态多普勒频移技术,提出一种支持高速飞机用户的卫星网络切换管理算法.在分析低轨道卫星网络覆盖地面低速用户特性的基础上,针对飞机用户高速运动和卫星自身高速移动的特点,就处于低轨卫星覆盖下的飞机用户进行星间切换的管理算法深入分析,对算法原理及切换过程进行详细的阐述,并通过建立数学模型推导出飞机用户发生卫星切换的时刻和位置的数学表达式.最后,以类Teledesic系统为例,就该算法中切换门限值的选取对卫星系统性能及服务质量的影响进行仿真分析,证明了该算法的有效性.
위해결저궤도위성통신계통지지고속비행적비궤용호무봉접입문제,기우동태다보륵빈이기술,제출일충지지고속비궤용호적위성망락절환관리산법.재분석저궤도위성망락복개지면저속용호특성적기출상,침대비궤용호고속운동화위성자신고속이동적특점,취처우저궤위성복개하적비궤용호진행성간절환적관리산법심입분석,대산법원리급절환과정진행상세적천술,병통과건립수학모형추도출비궤용호발생위성절환적시각화위치적수학표체식.최후,이류Teledesic계통위례,취해산법중절환문한치적선취대위성계통성능급복무질량적영향진행방진분석,증명료해산법적유효성.
To solve the problem of supporting aeronautical users to access satellite network of Low Earth Orbit (LEO) seamlessly, a novel handover algorithm based on dynamic Doppler shift was proposed. After analyzing the characteristic of satellite coverage for the grounded users with low velocity, the inter-satellite handover algorithm for aeronautical users covered by LEO satellites was researched in-depth, concerning the high velocity movement of users and the satellite. After detailed demonstration of the principal and process of the handover, the mathematical expressions of the time and position of aeronautic users when handover happens were derived out by establishing the mathematical model. Finally, with the Teledesic-like satellite system as an example, the authors analyzed the effect of the selection of time-to-handover on the performance of the system and its quality of service through the simulation, so that the validity of this algorithm was proved.