摘要
由于低仰角测控通信具有大动态、大范围的多径衰落和多普勒频移,因此低仰角测控通信是临近空间通信的难点。文中主要讨论了临近空间低仰角测控通信中的两个基本问题:临近空间测控通信低仰角情况下的信道建模与仿真,以及临近空间低仰角测控信号参数的估计。通过仿真结果可以看出,文中所提出的最大似然联合估计方法性能较好,在地空二径信道模型中可以达到联合参数估计的CRB要求。
Near-space Telemetry,Tracking and Commanding（TTC） communications are of great importance in military applications.Due to the existence of dynamic,wide-range multipath fading and Doppler frequency shift,the low-elevation TTC communication is especially difficult in near-space TTC communications.In this article,two fundamental problems in near-space low-elevation TTC communications are studied：the channel model in near-space low-elevation TTC communications is constructed;and simulations are correspondingly conducted.The parameters of the near-space low-elevation TTC signals are estimated.Simulation results show that the proposed estimation method has good performance and meet the CRB requirements of joint parameter estimation.
出处
《电子科技》
2012年第4期68-70,共3页
Electronic Science and Technology
关键词
临近空间
信道模型
联合估计
Near Space
Channel Model
Joint Estimation
