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71 条记录 (耗时 0.011 秒)

    Ion thruster
    42.
    发明公开
    Ion thruster 失效
    离子推进器

    公开(公告)号：EP0733800A1

    公开(公告)日：1996-09-25

    申请号：EP96301210.9

    申请日：1996-02-22

    申请人： MATRA MARCONI SPACE UK LIMITED

    发明人： Smith, Peter

    IPC分类号： F03H1/00 ,  H01J27/02

    CPC分类号： F03H1/0056 ,  H01J27/024

    摘要： An ion thruster comprises a chamber in which propellant is ionised and an accelerator grid, whereby a flow of ions out of the chamber provides reactive thrust. Charge exchange between neutral atoms of propellant and fast moving ions produces slow ions which impact on the accelerator grid and erode it by sputtering, thus limiting the lifetime of the thruster. The invention includes an accelerator grid comprising a layer which includes graphite providing resistance to erosion and a support layer which overcomes the restrictions on engineering and strength of graphite. The accelerator grid can be constructed by machining a block of graphite 12 to produce an upper surface 13, to which the molybdenum grid 14 can be fixed. The block 12 can then be cut away to permit the graphite to be machined to the same contour as the surface 13. Apertures are drilled through the graphite using the existing apertures of the grid 14 as guides.

    摘要翻译： 离子推进器包括其中推进剂被离子化的腔室和加速器格栅，由此离开腔室的离子流提供反作用推力。 推进剂的中性原子与快速移动的离子之间的电荷交换产生慢速离子，其影响加速器格栅并通过溅射腐蚀它，从而限制推进器的寿命。 本发明包括加速器格栅，该加速器格栅包括包含耐侵蚀的石墨层和克服石墨的工程和强度限制的支撑层。 加速器格栅可以通过加工一块石墨12来构建，以产生钼格栅14可以固定到其上的上表面13。 然后可以切割块体12以允许将石墨加工成与表面13相同的轮廓。使用格栅14的现有孔作为导向件钻穿石墨。

    A digitally controlled beam former for a spacecraft
    43.
    发明公开
    A digitally controlled beam former for a spacecraft 失效
    数字表达式Einrichtung zur Antennenstrahlformungfürein Raumfahrzeug。

    公开(公告)号：EP0642191A1

    公开(公告)日：1995-03-08

    申请号：EP94303163.3

    申请日：1994-04-29

    申请人： MATRA MARCONI SPACE UK LIMITED

    发明人： Shawyer, Roger John

    IPC分类号： H01Q3/26

    CPC分类号： H01Q3/267

    摘要： A digitally controlled beam former for a spacecraft which includes means for periodically calibrating the feed paths of the spacecraft's antenna array by measuring the apparent movement of the centre of a reference signal and a nominal signal and utilising the measured data to compensate for at least the phase drift in the antenna feed paths. The measured data may also be used to compensate for amplitude and phase drift in the antenna feed paths.

    摘要翻译： 一种用于航天器的数字控制波束形成器，其包括用于通过测量参考信号的中心和标称信号的明显移动来周期性地校准航天器天线阵列的馈送路径的装置，并利用测量数据来补偿至少相位 天线馈电路径漂移。 测量数据也可用于补偿天线馈送路径中的幅度和相位漂移。

    Digital chirp generator
    45.
    发明公开
    Digital chirp generator 失效
    数字啁啾发生器

    公开(公告)号：EP0478264A1

    公开(公告)日：1992-04-01

    申请号：EP91308653.4

    申请日：1991-09-24

    申请人： MATRA MARCONI SPACE UK LIMITED

    发明人： Parkes, Stephen Maxwell, c/o British Aerospace

    IPC分类号： H03B23/00

    CPC分类号： H03B23/00 ,  H03B2200/0092

    摘要： A digital chirp generator for generating linear frequency modulated signals, comprises a plurality of frequency/phase accumulators 10 pipelined together. Each frequency/phase accumulator includes a frequency accumulator driving phase accumulator. In the pipelined configuration the frequency accumulator and the phase accumulator of each frequency/phase accumulator are interconnected with the corresponding accumulator of the neighbouring frequency/phase accumulator.

    摘要翻译： 用于产生线性频率调制信号的数字线性调频发生器包括流水线连接在一起的多个频率/相位累加器10。 每个频率/相位累加器包括一个频率累加器驱动相位累加器。 在流水线配置中，每个频率/相位累加器的频率累加器和相位累加器与相邻频率/相位累加器的相应累加器互连。

    Beam steerer
    50.
    发明公开
    Beam steerer 审中-公开
    梁操舵手

    公开(公告)号：EP0903608A2

    公开(公告)日：1999-03-24

    申请号：EP98307534.2

    申请日：1998-09-16

    申请人： MATRA MARCONI SPACE UK LIMITED

    发明人： Lewis, Jeffrey Wyn

    IPC分类号： G02B26/08

    CPC分类号： G02B26/0808 ,  G02B26/0875

    摘要： Beam steerers are used in optical communications to direct a light signal towards a selected angular direction. Conventionally, the light signal is finely steered by employing mirrors to reflect the light signal. A beam steerer, arranged to direct a light signal in a free space optical communications system includes a pair 6,7 of lenses, through which a light signal 17 is transmissible, the lenses having opposite and substantially equal optical power, and displacing means 8,9 for translating one lens with respect to the other, transverse to an optical axis of the lenses. The provision of lenses permits the angular deflection of the beam per unit distance translation of a lens to be selected, as this is dependent on the optical power of the lenses. Selection of this ratio is not possible with mirror-based beam steerers.

    摘要翻译： 光束导向器用于光通信以将光信号导向选定的角度方向。 传统上，通过采用反射镜来反射光信号，光信号被精确地控制。 布置成在自由空间光通信系统中引导光信号的光束控制器包括一对透镜6,7，光信号17可透过该透镜，透镜具有相反且基本相等的光焦度，以及位移装置8， 用于使一个透镜相对于另一个透镜平移，横向于透镜的光轴。 提供透镜允许选择透镜的每单位距离平移的角度偏转，因为这取决于透镜的光焦度。 这种比例的选择对于镜面光束控制器是不可能的。