摘要
在卫星通信系统中,卫星是一个很重要的环节,卫星转发器的参数在一定程度上决定着整个系统的性能。转发式卫星导航系统是一个导航通信一体化的系统,通信系统中的微小卫星终端由于其发射天线波束宽,从邻星干扰方面考虑,远区卫星还处在微小卫星终端的主瓣内,因此发射功率受到了限制,是一个很明显的上行功率受限的系统。为了缓解对发射终端的压力,文中对卫星转发器的增益衰减档对整个通信系统的性能影响进行了分析,得到的结果显示,在转发器增益衰减档减小时,整个系统的性能可以得到提高。试验结果也表明,对于微小卫星终端系统,卫星转发器的增益档设置在2dB左右比较适宜。
Satellite plays a very important role in satellite communication system. System performance is based on parameters of satellite transponder to a certain degree. Transponding Satellite Navigation System is a unified navigation and communication system. In the communnicatin system, because the antenna beam is wide, far-away satellite is in the main lobe of the micro satellite terminal in consideration of adjacent satellite interference. Therefore, the transmit power is under restriction, which makes the system uptink power limited. In order to relieve the pressure of transmit termial, influence of satellite transponder attenuation on this communication system is analyzed. The result shows that the performance of whole system can be improved when the attenuation decreases. System test also shows that for the micro satellite terminal, it is proper to make the attenuation be about 2dB.
出处
《通信技术》
2008年第10期1-3,共3页
Communications Technology
基金
国家重点基础研究发展计划(973计划)资助(编号:2007CB815500)。
关键词
转发式卫星导航
卫星通信
链路分析
回传
衰减
系统余量
transponding satellite navigation
satellite communication
link analysis
inbound communication
attenuation
system margin
