基于DRFM的匀加速距离门拖引干扰信号的频谱分析

研究了基于DRFM的匀加速距离门拖引干扰信号的频谱。由于DRFM的离散化采样,导致干扰信号频谱有两个明显特征。首先,频谱相对于中心频率会出现微小可测的频移;其次,频谱由菲涅尔谱及其周期性的谐波组成,且在特定情况下会出现频谱的交叠。首先推导了匀加速距离门拖引的时域表达式并分析其频谱,并从理论上得出频移、谐波中心的位置以及频谱交叠的条件。最后通过对时域信号的fft仿真,验证所作理论推导的正确性。

Spectrum of a Digital Radio Frequency Memory Uniform Accelerated Range Gate Stealer Electronic Attack Signal

In this paper,the spectrum of digital radio frequency memory uniform accelerated range gate stealer is examined. Constrained by the discrete sampling of the device,the spectrum of output signal would have two noticeable characteristics. The first is the small but measurable center frequency shift from the input center frequency. The second is the presence of harmonics of the periodic Fresnel spectrum,and the spectrum would be overlapping under some circumstances. At first,the time-domain signal is deduced,then expression are developed to predicted the frequency shift ,the locations of the harmonics and the condition of overlap. At last,the simulation of time-domain signal to demonstrate the correctness of the analysis is presented.