综合测控终端码分多址干扰分析

Multi Access Interference(MAI) of Comprehensive Measuring Terminal

为适应超高声速临近空间飞行器的全程测控通信需求,需多个地面站与飞行器上的综合测控终端协同工作完成全程测控任务,要求综合测控终端具有多目标测控能力。基于CDMA系统的多目标测控系统,综合测控终端接收端必然存在多址干扰,通过分析综合测控终端接收多站信号解扩工作原理,分析同一码组中平衡gold码的自相关函数、互相关函数特性以及相互影响得出,综合测控终端多址信号之间信号能量的定量关系。根据分析结论和某工程测试验证可知,通过合理布局地面测控站,综合测控终端可在不增加干抗扰抑制算法的条件下,在全程测控范围内正常接收多路扩频信号。

For whole distance measuring communication request of the hypersonic vehicle near space,multiple ground station and comprehensive measuring terminal compose a multi-user synchronous Code Division Multiple Access(CDMA)communication system.In the system,comprehensive measuring terminal is used as a Multiuser Detector.This method still exists MAI problem.Based on the study of the principle of the receiver,self-correlation function and cross-correlation function of the balance gold code,this thesis is to research several typical experiment,and gives a standpoint of the energy relation for multiuser detection(MUD)techniques.When multiple ground station meet the energy relation,multiple ground station and terminal can work together well even if terminal has no restraining MAI algorithm.