【摘要】 跟踪与数据中继卫星系统(tracking and data relay satellite system,TDRSS)中,通道间群时延失真是影响TDRSS地面数字多波束形成性能的一个重要因素。首先介绍了群时延的概念和表达式,以及TDRSS信道的群时延失真数学模型,然后根据最小相位系统的系数和复倒谱系数之间的关系,设计了满足仿真要求的线性群时延滤波器,在MATLAB/SIMULINK仿真软件包中建立了多路群时延失真信道模型,针对QPSK信号在多路群时延失真信道特性下的误码性能进行仿真和分析。仿真结果表明,当最大群时延失真分布情况相同时,通道数对TDRSS误码率性能的影响并不显著。更多还原

【Abstract】 Group delay distortion between channels is an important factor which affects the ground multi-beam formation of tracking and data relay satellite system(TDRSS).The basic concept and expressions of group delay and satellite group delay channel model are first introduced,and then a liner group delay filter is designed based on the relationship between the group delay function and the cepstral coefficients.A multi-channel group delay distortion model for simulation in MATLAB/SIMULINK software is established.A QPSK system is simulated in multi-channel group delay.Simulation result shows that when in the same distribution the influence of the number of group delay distortion channels on TDRSS bit error rate(BER)performance is not pronounced.更多还原