At an accelerating development pace, Hicro-Nano Satellite technology has become one of the most ac- tive research topics in the current aerospace field. Its applications have been extended from engineering education a...At an accelerating development pace, Hicro-Nano Satellite technology has become one of the most ac- tive research topics in the current aerospace field. Its applications have been extended from engineering education and technology demonstration into various other fields, such as communication, remote sensing, navigation and scientific experiments just to name a few, In this paper issues raised on Micro/Nano-Satellites in recent news are reviewed and the opportunities and challenges confronting Micro/Nano-Satellites are analyzed. Then the Plicro/nano-Satellites of Na- tional University of Defense Technology, （NUDT） are briefly introduced. Finally, some suggestions on the development of Micro/Nano-Satellites in the future are proposed.展开更多
围绕"嫦娥4号"月球轨道超长波天文观测微卫星展开研究,针对微纳卫星对地数传资源的限制,提出一种在轨信号预处理方法:通过10通道数字下变频链路实现原始数据的变频接收,再利用多级滤波器抽取获得低采样率基带数据,下变频本振...围绕"嫦娥4号"月球轨道超长波天文观测微卫星展开研究,针对微纳卫星对地数传资源的限制,提出一种在轨信号预处理方法:通过10通道数字下变频链路实现原始数据的变频接收,再利用多级滤波器抽取获得低采样率基带数据,下变频本振频率可调,在对地数传资源约束下保证了不同频带数据的灵活选取。以上方法实现了一种10频点超窄带梳状滤波,仿真验证表明,采样率80 MSPS基带带宽为1 k Hz的情况下,此方法可在现场可编程门阵列平台上稳定运行,能保证带内平坦度和线性相位等关键技术指标,数据量与直接下传原始数据相比,降低了3个数量级以上。展开更多
文摘At an accelerating development pace, Hicro-Nano Satellite technology has become one of the most ac- tive research topics in the current aerospace field. Its applications have been extended from engineering education and technology demonstration into various other fields, such as communication, remote sensing, navigation and scientific experiments just to name a few, In this paper issues raised on Micro/Nano-Satellites in recent news are reviewed and the opportunities and challenges confronting Micro/Nano-Satellites are analyzed. Then the Plicro/nano-Satellites of Na- tional University of Defense Technology, （NUDT） are briefly introduced. Finally, some suggestions on the development of Micro/Nano-Satellites in the future are proposed.
文摘围绕"嫦娥4号"月球轨道超长波天文观测微卫星展开研究,针对微纳卫星对地数传资源的限制,提出一种在轨信号预处理方法:通过10通道数字下变频链路实现原始数据的变频接收,再利用多级滤波器抽取获得低采样率基带数据,下变频本振频率可调,在对地数传资源约束下保证了不同频带数据的灵活选取。以上方法实现了一种10频点超窄带梳状滤波,仿真验证表明,采样率80 MSPS基带带宽为1 k Hz的情况下,此方法可在现场可编程门阵列平台上稳定运行,能保证带内平坦度和线性相位等关键技术指标,数据量与直接下传原始数据相比,降低了3个数量级以上。
