航天器工程2018，Vol.27Issue(1)：52-57,6.DOI:10.3969/j.issn.1673-8748.2018.01.007
抗多径效应的全范围多员出舱通信方法
Full Range Anti-multipath Effect Extravehicular Communications Method for Multiple Astronauts
摘要
Abstract
Considering the large-scale of manned spacecraft and the increasing range of EVA,a full range anti-multipath effect extravehicular communications method for multiple astronauts is proposed.The method can solve the problem of low coverage and severe multipath effect which can't be solved by traditional methods.Multiple antennas are evenly distributed around the outside of manned spacecraft to ensure the full communications coverage of EVA.FDD (frequency division dual)is adopted and different frequency is assigned to the forward link and backward link respectively.DS-CDMA (direct-sequence code division multiple access)is applied and diverse spreading codes are distributed to each extravehicular astronaut,so that the problem of extravehicular communications interference between multiple astronauts is solved.In order to weaken the multipath effect brought by shield and reflection of manned spacecraft,the forward link adopts time diversity technology while the backward link adopts space diversity technology.Simulation is carried out,and the results show that the signal to noise ratio can be reduced 1.1~4.5dB by the method above proposed to realize the BER (bit error rate)of 10-5 comparing with the traditional methods of single-antenna and three-antenna,and the method proposed can realize the full range of extravehicular communications without interruption.关键词
全范围出舱通信/多径效应/天线组阵/直扩码分多址/时间分集/空间分集Key words
full range EVA communications/multipath effect/antenna arraying/DS-CDMA/time diversity/space diversity分类
信息技术与安全科学引用本文复制引用
龙吟,王岩,王悦,黄克武,崔久鹏,刘超,程伟..抗多径效应的全范围多员出舱通信方法[J].航天器工程,2018,27(1):52-57,6.基金项目
国家重大科技专项工程 （）
