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    • 42. 发明申请
    • FMWC SIGNAL GENERATOR AND RADAR APPARATUS USING FMCW SIGNAL GENERATOR
    • FMWC信号发生器和使用FMCW信号发生器的雷达设备
    • US20100073222A1
    • 2010-03-25
    • US12407817
    • 2009-03-20
    • Toshiya MitomoHiroaki HoshinoOsamu WatanabeShoji Otaka
    • Toshiya MitomoHiroaki HoshinoOsamu WatanabeShoji Otaka
    • G01S13/00
    • G01S13/345G01S7/35
    • An FMCW signal generator includes a frequency divider to divide the FMCW signal at a preset dividing ratio, a reference signal generator to periodically generate a reference signal at a second time interval not less than a loop time constant set for a PLL, a frequency of the reference signal being discretely swept within a range of fc±Δf (fc is a center frequency, and Δf is a frequency sweep width) at a first time interval not more than the loop time constant, a comparison unit to compare the frequency divided signal with the reference signal to generate a comparison result signal corresponding to a phase difference between the frequency divided signal and the reference signal, a loop filter to filter the comparison result signal to generate a control voltage signal, and a VCO to have an oscillation frequency thereof controlled by the control voltage signal.
    • FMCW信号发生器包括分频器,用于以预设的分频比对FMCW信号进行分频,参考信号发生器以不小于为PLL设置的环路时间常数的第二时间间隔周期性地产生参考信号,频率为 参考信号在fc±&Dgr的范围内离散地扫描; f(fc是中心频率,并且&Dgr; f是频率扫描宽度)在不大于循环时间常数的第一时间间隔,比较单元 具有参考信号的频率分频信号,以产生对应于分频信号和参考信号之间的相位差的比较结果信号;环路滤波器,用于对比较结果信号进行滤波以产生控制电压信号;以及VCO, 振荡频率由控制电压信号控制。