The satellite constellation classes, which are suitable for the medium earth orbit tracking and data relay satellite system (MEO-TDRSS) of China, are investigated. On the basis of the functionality and the traffic d...The satellite constellation classes, which are suitable for the medium earth orbit tracking and data relay satellite system (MEO-TDRSS) of China, are investigated. On the basis of the functionality and the traffic distribution characteristic of MEO-TDRSS, the coverage performance and inter-satellite link properties of four different constellation schemes are compared by simulations. Simulation results indicate that the rosette and common-track constellations, whose satellites are distributed on the celestial sphere more uniformly, are appropriate for the implementation of MEO-TDRSS of China.展开更多
分析了跟踪与数据中继卫星系统(trucking and data relay satellite system,TDRSS)高速反向链路数据组2(data group2,DG2)传输带宽和功率受限的特点,针对其在高信息传输速率条件下提高抗干扰能力的需求,提出了多进制扩频抗干扰...分析了跟踪与数据中继卫星系统(trucking and data relay satellite system,TDRSS)高速反向链路数据组2(data group2,DG2)传输带宽和功率受限的特点,针对其在高信息传输速率条件下提高抗干扰能力的需求,提出了多进制扩频抗干扰方案。在研究了多进制扩频技术在高速率传输下抗干扰性能的基础上,结合该技术对高速链路进行建模,并根据模型进行了数字与半实物仿真。仿真结果证明了多进制扩频抗干扰技术能在有限的传输带宽内大大提高高速反向链路抗干扰性能。展开更多
为了在跟踪与数据中继卫星系统(TDRSS)中实现码分多址(CDMA)应用,需要完成多用户检测(MUD)及码分多址干扰(MAI)抑制。采用减性多级迭代对消算法,在数字信号处理芯片中完成信号再生、延时校正、时域相减对消,可以完成至少12通道的多用户...为了在跟踪与数据中继卫星系统(TDRSS)中实现码分多址(CDMA)应用,需要完成多用户检测(MUD)及码分多址干扰(MAI)抑制。采用减性多级迭代对消算法,在数字信号处理芯片中完成信号再生、延时校正、时域相减对消,可以完成至少12通道的多用户检测,并能将多址干扰抑制至最小1 d B以内。该算法可作为通用MUD算法的有效补充,并能应用于各类非最优的CDMA系统中,具有迭代级数可选、通道扩展性强、工程实现性好的优点。展开更多
基金the National Natural Science Foundation of China (60372013)
文摘The satellite constellation classes, which are suitable for the medium earth orbit tracking and data relay satellite system (MEO-TDRSS) of China, are investigated. On the basis of the functionality and the traffic distribution characteristic of MEO-TDRSS, the coverage performance and inter-satellite link properties of four different constellation schemes are compared by simulations. Simulation results indicate that the rosette and common-track constellations, whose satellites are distributed on the celestial sphere more uniformly, are appropriate for the implementation of MEO-TDRSS of China.
文摘分析了跟踪与数据中继卫星系统(trucking and data relay satellite system,TDRSS)高速反向链路数据组2(data group2,DG2)传输带宽和功率受限的特点,针对其在高信息传输速率条件下提高抗干扰能力的需求,提出了多进制扩频抗干扰方案。在研究了多进制扩频技术在高速率传输下抗干扰性能的基础上,结合该技术对高速链路进行建模,并根据模型进行了数字与半实物仿真。仿真结果证明了多进制扩频抗干扰技术能在有限的传输带宽内大大提高高速反向链路抗干扰性能。
文摘为了在跟踪与数据中继卫星系统(TDRSS)中实现码分多址(CDMA)应用,需要完成多用户检测(MUD)及码分多址干扰(MAI)抑制。采用减性多级迭代对消算法,在数字信号处理芯片中完成信号再生、延时校正、时域相减对消,可以完成至少12通道的多用户检测,并能将多址干扰抑制至最小1 d B以内。该算法可作为通用MUD算法的有效补充,并能应用于各类非最优的CDMA系统中,具有迭代级数可选、通道扩展性强、工程实现性好的优点。