复杂姿态下基于空时码的测控方法  

TT&C and Communication in Complex Attitude Conditions Based on Space-Time Coding

作　　者：朱宏鹏 李志强[1] 向中武 蔡君 ZHU Hongpeng;LI Zhiqiang;XIANG Zhongwu;CAI Jun(PLA University of Science and Technology,Nanjing 210007)

机构地区：[1]解放军理工大学,南京210007

出　　处：《飞行器测控学报》2017年第5期330-334,共5页Journal of Spacecraft TT&C Technology

基　　金：国家自然科学基金(No.61571464)。

摘　　要：为了提高复杂姿态条件下飞行器测控通信的可靠性,将LDPC(Low Density Parity Check,低密度奇偶校验)码和空时码级联,并采用2×1天线系统,建立了系统模型,阐述了信道参数估计方法,在此基础上提出了基于信道参数估计的空时软译码算法,使得空时译码器输出软信息给LDPC译码器,能充分利用LDPC的编码增益。仿真结果表明,不采用空时码时在π相位差附近出现很高的误码,导致通信中断;采用空时码能够保证在任何相位差的条件下误码率在一定的范围内,实现不间断测控。To improve the reliability of spacecraft Tracking,Telemetry and Command(TT&C)and communication in complex attitude conditions.A system model with concatenated Low Density Parity Check(LPDC)space-time codes and a 2×1 antenna system was established.A channel parameter estimation method was introduced and a soft space-time decoding algorithm based on channel parameter estimation was proposed.The decoding algorithm gives soft output information to the LDPC decoder,taking full advantage of LDPC coding gain.Simulation results show that there would be a poor Bit Error Rate(BER)performance without space-time coding while the phase difference of signal from two antennas is in the vicinity ofπ.But with space-time coding,the reliability of communication in any phase difference is guaranteed.

关 键 词：测控通信 复杂姿态 低密度奇偶校验(LDPC) 空时码 

分 类 号：V556[航空宇航科学与技术—人机与环境工程] TN911.22[电子电信—通信与信息系统]