过电离层核爆电磁脉冲信号模拟源的实现

摘要

Design a kind of digital NEMP signal source simulator. After aerosphere NEMP signal lengthways transfers trough ionosphere, its transient signal, and it's dispersive frequency, frequency spectrum is from 30 MHz ～ 300 MHz. Because of dispersal of the ionosphere, the high - frequency of pulse signal arrival before low -frequency. Based on DSP + DDS digital circuitry, realizing signal output of 30 MHz -300 MHz dispersive frequency transient signal, the output signal frequency can be 400 MHz, pulse time can be ms>, period of fre quency conversion is 4 ns. Experimentation with satellite - based NEMP detection in the laboratory indicate that the simulator realize the simulation of disperse frequency signal.%设计一种数字式核爆电磁脉冲信号源模拟装置.大气层核爆电磁脉冲纵向传输经过电离层后的信号属于瞬态脉冲信号,频率范围为30 MHz～300 MHz,因为电离层对电磁脉冲信号的色散特性,脉冲信号高频部分出现的时刻早于低频部分出现的时刻.基于DSP+ DDS数字电路实现了30 MHz～300 MHz频率色散瞬态脉冲信号的输出,其输出频率的最小控制周期为4 ns,幅值可调、波形规则、可靠性高、调试方便,实验证明模拟信号反映了大气层核爆电磁脉冲信号过电离层后的主要特征.