机构地区: 哈尔滨工业大学
出 处: 《遥测遥控》 2007年第4期57-62,共6页
摘 要: 在深空通信中,由于信号传输距离遥远,功率受限的下行链路信号衰减巨大。为解决上述问题,分析地球大气层和外层自由空间的传输特性差异,提出以地球同步轨道卫星为中继站的下行链路的构想,根据每一段链路特性的不同选择载波频率。仿真结果表明,中继链路可以提高信号传输的信噪比、增大信道容量、降低误码率,提高了深空通信下行链路的可靠性。 In the deep space communication,great attenuation of downlink signal is caused by the long distance of transmission.To solve this problem,the specialties of the earth aerosphere and outer space are analyzed,and an idea of relay downlink with a geosynchro- nous earth orbit satellite is put forward.Different frequencies are adopted according to the characteristics of different links.Relay downlink can achieve a higher ratio of signal-to-noise,increase the capacity of channel,reduce the bit error rate and enhance the reliability of down- link in the deep space communication.
关 键 词: 深空通信 链路衰减 中继链路 地球同步轨道卫星
领 域: [航空宇航科学与技术] [航空宇航科学技术]