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利用成对回波技术分析了作为放大链发射机激励源的频率合成器有杂散谱输出时发射机输出调频信号的频谱模型。指出了杂散谱的存在对雷达目标检测的影响，提出了降低频率合成器输出杂散谱的办法并给出实测结果。
The frequency spectrum model of the FM output signal of the transmitter when the spurious output of the frequency synthesizer is used as the excitation source of the amplifying chain transmitter is analyzed using the paired echo technique. The influence of stray spectrum on radar target detection is pointed out. The method to reduce the output spurious spectrum of frequency synthesizer is proposed and the measured results are given.