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    • 71. 发明公开
    • Coherent digital signal blanking, biphase modulation and frequency doubling circuit and methodology
    • 用于数字信号的相干消隐,对于两相调制和频率加倍的方法和电路装置。
    • EP0306760A1
    • 1989-03-15
    • EP88113633.7
    • 1988-08-22
    • Hughes Aircraft Company
    • Yang, Steve S.
    • G01S7/28H04L27/20H03K5/00
    • H03M5/12G01S7/28G01S13/288
    • An information bearing signal (the object signal) for use in radar or radar-like circuitry is generated in a digital circuit and then converted through a bandpass matching filter into a corresponding analog signal. The object signal is then first combined in a NAND gate with a blanking control signal. In one embodiment, the selectively blanked object signal is frequency doubled by combining the blanked object signal and its quarter wave length shifted version in an EXCLUSIVE-OR gate. Thereafter, the frequency doubled version of the blanked object signal is combined in a second EXCLUSIVE-OR gate with a biphase modulation control signal which selectively inverts or noninverts the frequency doubled object signal. The output of the biphase modulated frequency doubled signal is then gated through a blanking NAND gate and coupled to the bandpass matching filter. In a second embodiment the blanked object signal is first combined in an EXCLUSIVE-OR gate with the biphase modulated control signal and thereafter provided as an input to a second EXCLUSIVE-OR gate wherein it is combined with a quarter wave length version of the blanked object signal. The phase modulated frequency doubled signal is then coupled to a blanking NAND gate and bandpass matching filter as before. According to the values asserted for the biphase modulation control signal and blanking signal, the object signal is digitally frequency doubled, blanked and phase modulated as desired prior to conversion into analog form.
    • 在雷达或雷达的类似的电路中使用的承载信息的信号(目标信号)的数字电路中产生,然后通过带通滤波器匹配转换成相应的模拟信号。 对象信号然后与消隐控制信号的第一NAND门相组合。 在一个中,实施例选择性消隐对象信号频率由消隐对象信号和它的四分之一波长组合一倍在异或门移版本。 那里之后,频率加倍的消隐对象信号的版本中的第二异或用选择性反转或noninverts倍频信号对象一个双相位调制控制信号栅极结合。 双相位调制频率的输出加倍信号然后通过一个消隐NAND门控和耦合到带通滤波器匹配。 在第二个实施例中的消隐对象信号在第一组合到异或门与所述双相调制的控制信号,然后提供作为输入到第二异或门worin它与消隐对象的四分之一波长版本合并 信号。 相位调制频率加倍然后信号作为前耦合到消隐NAND门和带通滤波器匹配。 。据值断言双相位调制控制信号和消隐信号,该对象信号进行数字频率加倍,消隐和相位调制如所希望的在转换之前成模拟形式。