随着空间技术的快速发展,以星链为代表的低轨卫星数量呈爆炸式增长,对空间安全造成了巨大影响;低轨卫星具备空间在轨攻击、机动侦察干扰和高精度对地攻击的潜力,急需对其进行有效监测。传统光学监测手段采用的大型望远镜存在体积大、造...随着空间技术的快速发展,以星链为代表的低轨卫星数量呈爆炸式增长,对空间安全造成了巨大影响;低轨卫星具备空间在轨攻击、机动侦察干扰和高精度对地攻击的潜力,急需对其进行有效监测。传统光学监测手段采用的大型望远镜存在体积大、造价高、数量少、位置固定的缺陷,难以满足大批量、高灵活性监测需求,小型望远镜则兼具数量多、成本低、易于灵活部署的优势。提出一种基于小型望远镜的低轨卫星监测方法,利用双行轨道根数(Two Line Elements,TLE)预测低轨卫星的方位角和高度角,通过小型望远镜对低轨卫星和恒星进行成像后,利用改进的形态学击中击不中变换(Hit-Miss Transform,HMT)检测算法和拖尾星点提取算子分别提取卫星和恒星目标,根据卫星星点与恒星星点的几何关系得到低轨卫星的赤经赤纬数据。实验表明,基于小型望远镜系统能有效实现非合作低轨卫星监测,外符合精度优于3″,可满足对低轨目标的监测要求。展开更多
A novel pulsed-electrospray device is reported in this paper. With such an apparatus, the observation of the electrospray process under the pulsed high voltage conditions has been successfully made with microscope, os...A novel pulsed-electrospray device is reported in this paper. With such an apparatus, the observation of the electrospray process under the pulsed high voltage conditions has been successfully made with microscope, oscilloscope and mass spectrometer. By using pulsed spray technique, the sample flow rate can be averagely decreased to ＜100 nL/min. After increasing the frequency of pulsed high voltage, it is hopefully to directly combine this device to time-of-flight mass spectrometer and obtain a great enhancement both in signal-to-noise ratio and in detection sensitivity for mass spectrometry analysis.展开更多
文摘随着空间技术的快速发展,以星链为代表的低轨卫星数量呈爆炸式增长,对空间安全造成了巨大影响;低轨卫星具备空间在轨攻击、机动侦察干扰和高精度对地攻击的潜力,急需对其进行有效监测。传统光学监测手段采用的大型望远镜存在体积大、造价高、数量少、位置固定的缺陷,难以满足大批量、高灵活性监测需求,小型望远镜则兼具数量多、成本低、易于灵活部署的优势。提出一种基于小型望远镜的低轨卫星监测方法,利用双行轨道根数(Two Line Elements,TLE)预测低轨卫星的方位角和高度角,通过小型望远镜对低轨卫星和恒星进行成像后,利用改进的形态学击中击不中变换(Hit-Miss Transform,HMT)检测算法和拖尾星点提取算子分别提取卫星和恒星目标,根据卫星星点与恒星星点的几何关系得到低轨卫星的赤经赤纬数据。实验表明,基于小型望远镜系统能有效实现非合作低轨卫星监测,外符合精度优于3″,可满足对低轨目标的监测要求。
文摘A novel pulsed-electrospray device is reported in this paper. With such an apparatus, the observation of the electrospray process under the pulsed high voltage conditions has been successfully made with microscope, oscilloscope and mass spectrometer. By using pulsed spray technique, the sample flow rate can be averagely decreased to ＜100 nL/min. After increasing the frequency of pulsed high voltage, it is hopefully to directly combine this device to time-of-flight mass spectrometer and obtain a great enhancement both in signal-to-noise ratio and in detection sensitivity for mass spectrometry analysis.
