分析了基于数字射频存储器（DRFM）的运动目标模拟器（MTS）相参性。由于DRFM延时的离散性，引起了MTS输出信号相位的改变，破坏了信号的相参性，使MTS输出信号频谱发生变化，不仅使谱线位置移动，而且还产生了附加的寄生谱线。分析结果表职，延时更新率（Fc）决定了谱线间隔，并通过sinc函数决定谱线的幅度，而雷达信号频率与所模拟目标的速度共同决定谱线的移动。

In this paper,the coherency of a DRFM-based moving target simulator(MTS) is analyzed.The MTS output signal frequency spectrum will be changed due to the discrete nature of the DRFM time-delay which causes the signal phase change:it will not only make the spectrum lines shifted but also produce some additional spurious spectrum lines.The analysis results reveal that the delay update rate determines the spectral line spacing as well as their magnitude through the sinc function,while a combination of radar signal frequency and simulated target velocity determine the spectrum line shift.

TN955