透博梅卡公司探索新的涡轴发动机

虽然透博梅卡公司现在每年销售发动机超过650台,但它们却认为已经到了研制替换轴功率为450～670千瓦级发动机的时候了.     

Electronics brain design for advanced microspacecraft

A brief history of NASA robotic spacecraft computing architectures is given. Changing needs driving changes in features (10x reduction in cost, various increases in capability, 10x to 100x reduction in power, mass and volume) for spacecraft computing are discussed. An architecture which addresses these changes is proposed. Finally, future directions of exploration for this spacecraft computing architecture are considered.     

Radar: The Cassini Titan Radar Mapper

The Cassini RADAR instrument is a multimode 13.8 GHz multiple-beam sensor that can operate as a synthetic-aperture radar (SAR) imager, altimeter, scatterometer, and radiometer. The principal objective of the RADAR is to map the surface of Titan. This will be done in the imaging, scatterometer, and radiometer modes. The RADAR altimeter data will provide information on relative elevations in selected areas. Surfaces of the Saturn’s icy satellites will be explored utilizing the RADAR radiometer and scatterometer modes. Saturn’s atmosphere and rings will be probed in the radiometer mode only. The instrument is a joint development by JPL/NASA and ASI. The RADAR design features significant autonomy and data compression capabilities. It is expected that the instrument will detect surfaces with backscatter coefficient as low as −40 dB.RADAR Team LeaderThis revised version was published online in July 2005 with a corrected cover date.     

欧洲通过内外的合作推动无人机的发展

欧洲正在通过欧洲各国之间及其与非欧洲国家之间的合作,加速推动欧洲无人机的发展。在过去的两年间,欧洲为了缩短与美国及以色列在无人机领域的差距,已经作了艰苦努力,开始自主开展无人作战飞机(UCAV)以及中空长航时无人侦察系统的研制工作,并在美国及以色列的经验基础上,重新评估对战术无人机的需求。而海军对垂直起降无人机的需求也逐渐明朗化了。     

Double Langmuir Probes for Hypervelocity Wakes

Double Langmuir probes have been used to measure the ionization intensity in the wake of a hypervelocity projectile; subsidiary experiments to check the validity of the results are described. The spectral characteristic of the fluctuating part of the probe signal has been examined. Because of theoretical and experimental difficulties the results can at most be regarded as giving a qualitative picture of the turbulent structure of the wake. They do show, however, the predominant part played by eddies of roughly the wake diameter, agreeing on the average with the results of Clay et al. [1].     

"伽利略"首颗卫星升空的战略意义

作为两颗"伽利略在轨验证元素"(GIOVE)试验卫星中的第一颗,Giove-A,于2005年12月28日当地时间上午11时19分在哈萨克斯坦拜科努尔航天中心发射升空,经过"弗雷盖特"(Fregat)上面级火箭的三次点火后,这颗由英国萨里卫星技术公司制造的试验卫星被送入了高23230千米、倾角56度的轨道.     

北约制定无人机发展路线图

北约(NATO)最近出台了一份名为《无人机系统飞行计划》的战略指导文件,要求 NATO 及各成员国共同制定一个无人机采办和使用的协同计划,包括 NATO 采办自己的无人机系统计划、各成员国采办高空长航时(HALE)无人机系统计划,