CAJ | 학술논문

结合航空移动通信环境的三维非稳态特征，推导了立体空域内散射体相对于收发节点随机运动散射场景的时域自相关函数的数学表达式。该表达式为有限区间内的高维积分，结合蒙特卡洛高维积分法和射线跟踪法验证了该表达式的正确性。数值结果表明：节点运动速度、散射体速度和散射体数量越大，相应的时域自相关函数衰减越快。该表达式和求解办法具有较强的推广性，通过降维可等效为二维散射场景，令散射体相对于收发节点静止可等效为稳态散射场景。相关结论可为下一代航空移动通信宽带传输体制的相干时间与相干距离的确定提供理论支撑。
결합항공이동통신배경적삼유비은태특정，추도료입체공역내산사체상대우수발절점수궤운동산사장경적시역자상관함수적수학표체식。해표체식위유한구간내적고유적분，결합몽특잡락고유적분법화사선근종법험증료해표체식적정학성。수치결과표명：절점운동속도、산사체속도화산사체수량월대，상응적시역자상관함수쇠감월쾌。해표체식화구해판법구유교강적추엄성，통과강유가등효위이유산사장경，령산사체상대우수발절점정지가등효위은태산사장경。상관결론가위하일대항공이동통신관대전수체제적상간시간여상간거리적학정제공이론지탱。
The expression of the temporal autocorrelation function for the three dimensional (3D) and non-stationary aeronautical scattering environment is derived, where the scatters are in random motion relative to transceivers. The expression involves high dimensional integration with finite interval, thus a ray-tracing based model is proposed to verify its validity. Numerical results show that as the increase of the velocity of transceivers or the velocity and density of the scatters increases, the temporal autocorrelation function would attenuate more rapidly. The deduced expression and the proposed ray-tracing based model can be extended to other scenarios. Both the two dimensional (2D) multipath scattering and the stationary multipath scattering are two special cases. These results allow engineers more appropriate determination on the coherence time and coherence bandwidth for the future broadband aeronautical mobile communication.