导航辅助下基于LAS码的天基多目标测控  

Space-Based Multi-Object TT&C with Navigation Aids Based on LAS Code

作　　者：李飞龙 梁波 李志强[1] 马城城 杨杰[1] 

机构地区：[1]解放军理工大学 [2]75836部队 [3]北京微电子技术研究所

出　　处：《飞行器测控学报》2017年第2期93-100,共8页Journal of Spacecraft TT&C Technology

基　　金：国家自然科学基金(No.61571464;No.61601511;No.91338201)

摘　　要：中继卫星的天基测控是解决中低轨道航天器大范围、长时间、多目标测控的有效途径,但用户星到中继卫星的时延误差、多普勒频移校正误差等参数会对多目标测控带来干扰。针对该问题,首先分析了定位误差引起的时延误差、多普勒频移校正误差等因素,设计了天基多目标前向链路遥控SMA(S-band Multiple Access,S频段多址)信号形式和反向遥测链路SMA信号形式,选择与时延校正误差相匹配的LAS(Large Area Synchronous,大区域同步)码作为反向遥测信息的扩频码,建立了导航辅助的终端时延和频率预校正方案模型,可以有效消除多用户干扰。仿真表明,当Eb/N0≥10.5dB时,前向遥控信息误码率pe≤1×10^(-6),反向遥测信息误码率pe≤1×10^(-6),使用LAS码比Gold序列约有2dB性能改善,为基于我国天链卫星的中低轨道卫星稳定运行、载人航天交会对接以及后续空间站建设等任务的测控提供重要参考。With the rapid development of China＇s manned space flights,Beidou navigation and Low Earth Orbit（LEO）constellation system,Tracking and Data Relay Satellite（TDRS）provides a fundamental solution to solve the long time,high coverage and multi-satellites Tracking,Telemetry and Command（TTC）problems for its space-based design thinking.In this process,parameters such as time delay of user satellites to relay satellites and correction error of Doppler frequency shift will bring interference to multi-object TTC.In order to solve this problem,this paper analyzes factors such as time delay,Doppler frequency shift correction error due to positioning error,design S-band Multiple Access（SMA）signal form of forward link and reverse link based on the multi-object,choose Large Area Synchronous（LAS）code matching the time delay correction error as the spread spectrum code of the reverse telemetry information,and then proposes a navigation aided terminal delay and frequency pre-correction scheme model,which can eliminate multi-user interference effectively.Simulation results show when Eb/N0 of reverse link is more than 10.5dB,the bit error rate of telemetry information is less than 1×10^-6,which is economized 2dB compared with Gold sequence.It provides an important reference to space-based TTC for the stable operation of satellites in orbit,manned space rendezvous and docking and subsequent space station construction,etc.

关 键 词：中继卫星(TDRS) 天基测控 多目标测控 大区域同步(LAS)码 导航辅助 准同步码分多址(QS-CDMA) 

分 类 号：V556.1[航空宇航科学与技术—人机与环境工程]