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    • 60. 发明申请
    • IMAGING SYSTEM
    • 成像系统
    • US20130127667A1
    • 2013-05-23
    • US13521932
    • 2011-01-14
    • Martin SchneiderMichael CrowleyBrendan LyonsDavid O'DriscollKlaus-Michael Hussmann
    • Martin SchneiderMichael CrowleyBrendan LyonsDavid O'DriscollKlaus-Michael Hussmann
    • H01Q3/24
    • H01Q3/46G01S13/89G01V8/005H01Q3/247
    • An imaging system (1) comprises an antenna array (2), 24 GHz transceivers (3), and a digital receiver (4) including an ADC and circuits for filtering. The digital receives commands from the host PC (5) and passes data to the host PC (5) for display. The host PC 5 initiates volume scans, performs system diagnostics and error reporting, and collects scan data and displays it for the operator. The digital receiver (4) presents the scan requests to the antenna array (2) in a synchronised manner. All control signals in the antenna array are presented via a presentation clock (an individual presentation clock being generated for sub-sections of the array; of the order of five hundred presentation clocks are generated). The spectral content of each presentation clock is adjusted via a spreading circuit, thus adjusting the spectral interference radiated through the printed circuit board traces to the FET elements that each presentation clock feeds. The spreading clock generation circuit include taps (Tap 1, Tap 2 . . . Tap N) on a delay line, feeding a multiplexer. Delayed versions of the master clock are switched onto the presentation clock in a given sequence such that the presentation clock is composed of different phases of the master clock. This alters the spectral content of the presentation clocks with respect to the master clock, lowering the power at the fundamental frequency. This in turn lowers the power at the harmonics of the fundamental, reducing the electromagnetic radiation across the spectrum. The presentation clocks may be offset in their spreading pattern and hence in their presentation frequency such that the electromagnetic radiation is further reduced.
    • 成像系统(1)包括天线阵列(2),24GHz收发器(3)和包括ADC的数字接收器(4)和用于滤波的电路。 数字接收来自主机PC(5)的命令,并将数据传送到主机PC(5)进行显示。 主机PC 5启动卷扫描,执行系统诊断和错误报告,并收集扫描数据并将其显示给操作员。 数字接收机(4)以同步的方式向天线阵列(2)呈现扫描请求。 天线阵列中的所有控制信号通过呈现时钟(为阵列的子部分生成的单独的演示时钟)生成;产生五百个演示时钟的次数)。 通过扩展电路调整每个呈现时钟的频谱内容,从而将通过印刷电路板走线辐射的频谱干扰调整到每个演示时钟馈送的FET元件。 扩展时钟产生电路在延迟线上包括抽头(Tap 1,Tap 2 ... Tap N),馈送多路复用器。 主时钟的延迟版本以给定的顺序被切换到呈现时钟,使得呈现时钟由主时钟的不同相位组成。 这相对于主时钟改变呈现时钟的频谱内容,降低基频处的功率。 这反过来降低了基波谐波的功率,从而减少了整个频谱的电磁辐射。 呈现时钟可以在它们的扩展模式中偏移,并因此在其呈现频率上偏移,使得电磁辐射进一步减小。