• 快讯 Gyro-free attitude and rate estimation for a small satellite using SVD and EKF

    来源专题:中科院西安光机所服务
    编译者:lib_yaya
    发布时间:2016-06-27
    Abstract. This paper describes the development of a gyroless attitude determination system that can rely on magnetometer and sun sensor measurements and achieve good accuracy. Vectors coming from the selected sensor data and developed models can be placed in Wahba's problem. The system uses Singular Value Decomposition (SVD) method to minimize the Wahba's loss function and determine the attitude of the satellite. In order to obtain the attitude of the satellite with desired accuracy an extended...
  • 快讯 NASA打造庞大的空间通信数据传输网络

    来源专题:中科院西安光机所服务
    编译者:lib_yaya
    发布时间:2016-06-27
    NASA打造庞大的空间通信数据传输网络。 在150年前儒勒·凡尔纳写下这篇小说的那个时代,这只是一种科学幻想。但今天来自宇宙飞船的数据信息在几分钟内就能传输到地球各处。 随着越来越多的卫星和航天器发射升空空间通信的需求日益增加。美国宇航局 (NASA) 正在打造一张无形的网络 — — — — — — 太空与地球数据传输网 (近期地球网络嫩),将为未来的空间数据接收和传输提供更出色的服务。 天地如何"系主任""只有当航天器出现在轨道上某个点的时候,天线才可以 '笑' 到它,这就好比你和我只有在看到对方的时候,才能互相交谈。"NASA正在打造的近地通信网 (近地球网络,嫩),是将低地轨道、同步轨道甚至绕月轨道航天器上的信息传回地球的一个空间通信渠道。科学家可利用这些信息资料在地面上进行各种研究。 像哈勃太空望远镜这样的绕轨道天文台、 不断收集着大量的数据、 如科学家的观察结果、航天器的运行情况等、 只有当这些数据返回地球并由研究人员进行加工处理后、 哈勃太空望远镜和其他...
  • 快讯 CaSSIS Sends First Image of Mars

    来源专题:中科院西安光机所服务
    编译者:lib_yaya
    发布时间:2016-06-21
    The Mars Camera CaSSIS on the ExoMars Trace Gas Orbiter captured its first images of the Red Planet this week. The pictures are a part of the mission's preparations for arriving at its destination in October. CaSSIS (Color and Stereo Surface Imaging System) has been developed by a team led by the University of Bern. It was launched with the European Space Agency's ExoMars Trace Gas Orbiter (TGO) in March and has already travelled just under half of its nearly 500 million km journey. While ...
  • 快讯 High-Tech Telescope for Dangerous Asteroids Detection Launched in Russia

    来源专题:中科院西安光机所服务
    编译者:lib_yaya
    发布时间:2016-06-21
    The country's first wide-angle telescope AZT-33 BM will be able to see any space boulder the size of the Tunguska meteorite a month before its collision with Earth. At the Sayan Observatory of the Institute of Solar-Terrestrial Physics of the Siberian Branch of the Russian Academy of Sciences, trial operation of the first wide-angle telescope in Russia has started. The AZT-33 VM telescope with a field view of 2.8 degrees was built in St. Petersburg by optical corporation JSC "LOMO," with the...
  • 快讯 Sites selected for world's largest gamma-ray detector

    来源专题:中科院西安光机所服务
    编译者:lib_yaya
    发布时间:2016-06-21
    The National Institute for Astrophysics wins the European competition: the board of the project has decided that the headquarters of the international organization leading one of the most prestigious infrastructure of modern physics will be located in Italy. The permanent headquarters of the CTA (Cherenkov Telescope Array) project will be located in Bologna, near a few of the most prestigious INAF regional offices, in an area where the University of Bologna is implementing structural growth ...