A Research on Direct Labour Consumption in Developing Satellite System 卫星系统研制过程活劳动消耗模型研究
Direct broadcasting satellite television up earth station system design 直播卫星电视上行地球站系统设计
A scheme for Internet access via DVB based direct broadcast satellite is proposed, and the system architecture, session establishment, protocol stack and IP packet encapsulation and delivering are illustrated. 提出了一种经由基于DVB的直播电视卫星实现因特网接入的方案,并对系统结构、会话建立、协议栈、IP分组的封装和传送作了详细的描述。
In Direct Broadcast Satellite ( DBS ) phased array antenna, the performance of phase shifter impacts the whole DBS antenna system greatly. 在卫星直播(DBS)相控阵天线中,移相器的性能对整个卫星直播天线接收系统有重要影响。
A direct mathematical expression for the relationship between the transmitter optics aperture and the satellite vibration amplitude has been derived. The assumption in the derived model is that the satellite communication system adapts on-off keying ( OOK ) modulation and an APD as the detector. 从接收机的比特误码率与发射机的振动关系出发,采用OOK调制方式,以APD为光电探测器,推导得到了描述发射机天线口径与发射机振动关系的数学模型。