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    Master clock generation unit for satellite navigation systems
    1.
    发明公开
    Master clock generation unit for satellite navigation systems 有权
    HaupttakterzeugungseinheitfürSatellitennavigationssysteme

    公开(公告)号：EP2246754A1

    公开(公告)日：2010-11-03

    申请号：EP09005827.2

    申请日：2009-04-27

    申请人： Astrium GmbH

    发明人： Felbach, Dirk

    IPC分类号： G04G3/00 ,  G04F5/14 ,  G01S1/00

    CPC分类号： G01S19/02

    摘要： The invention refers to a master clock generation unit (100) for satellite navigation systems, comprising:
    - a number of frequency inputs for receiving a respective atomic clock signal each clock signal having a first or a second reference frequency;
    - a number of frequency converters (110, 115, 120, 125) each of the frequency converters having a converter input (111, 116, 121, 126) connected to one of the frequency inputs (102, 104, 106, 108) and a converter output (112, 117, 122, 127) wherein each of the number of frequency converters is applied with an offset frequency by one or a number of frequency synthesizers (140, 145), the offset frequency being selected according to the first and the second reference frequency at the assigned frequency input (102, 104, 106, 108) for providing a same intermediate frequency at each of the converter outputs (112, 117, 122, 127);
    - a switching matrix (130) connected to each of the converter outputs (112, 117, 122, 127) for selecting one of the intermediate frequencies as a primary clock provided at a first matrix output (136) and another of the intermediate frequencies as a secondary clock provided at a second matrix output (135);
    - a frequency generator (150) having an generator input connected to the first matrix output and connected to a number of frequency outputs (202, 204, 206, 208) of the master clock generation unit (100), the frequency generator (150) being adapted for deriving an output reference frequency from the primary clock and providing the output reference frequency at the number of frequency outputs (202, 204, 206, 208); and
    - a phase meter (170) having a first meter input connected to the first matrix output (136) and a second meter input connected to the second matrix output (135) for determining a phase difference between the primary and the secondary clock for detecting abnormal behaviour.

    摘要翻译： 本发明涉及用于卫星导航系统的主时钟生成单元（100），包括： - 多个频率输入，用于接收相应的原子钟信号，每个时钟信号具有第一或第二参考频率; - 多个频率转换器（110,115,120,125），每个变频器具有连接到所述频率输入（102,104,106,108）之一的转换器输入（111,116,121,126）和 一个转换器输出（112,117,122,127），其中多个频率转换器中的每一个以偏移频率施加一个或多个频率合成器（140,145），所述偏移频率根据第一和/ 在分配频率输入端（102,104,106,108）上的第二参考频率用于在每个转换器输出端（112,117,122,127）处提供相同的中频; - 连接到每个转换器输出（112,117,122,127）的开关矩阵（130），用于将中间频率中的一个选择为在第一矩阵输出（136）提供的主时钟，另一个中间频率作为 提供在第二矩阵输出（135）处的辅助时钟; - 频率发生器（150），其具有连接到所述第一矩阵输出并连接到所述主时钟生成单元（100）的多个频率输出（202,204,206,208）的发生器输入，所述频率发生器（150） 适于从主时钟导出输出参考频率，并以频率输出数（202,204,206,208）提供输出参考频率; 以及 - 相位计（170），其具有连接到所述第一矩阵输出（136）的第一仪表输入端和连接到所述第二矩阵输出（135）的第二仪表输入端，用于确定用于检测的所述主时钟和所述辅助时钟之间的相位差 异常行为。