基于DDS的扫频干扰信号产生技术

传统的函数扫频压制干扰为避免温飘采用波形产生器调制锁相源的方法实现,但锁相源的低通滤波电路严重制约慢扫扫频模式下的频谱带宽,锁相源中VCO的非线性还影响带内幅频特性。采用FPGA直接控制DDS产生体现多种函数波形特性的中频扫频信号,克服了函数扫频干扰无法实现慢扫扫频干扰的瓶颈问题。

The technique of sweep jamming signal on the base of DDS

To avoid temperature shift, traditional implementation method of blocking suppressing jamming use function wave signal modulate PLL. But when the frequency of sweep jamming signal become low,the low- pass filter of Pi.L will change waveform,thus further improve the output signal of bandwidth. And the nonlin- earity of the voltage and frequency conversion wit-h VCO which in the PLL will influence the amplitude-fre- quency eharacteristics. Describes how to use FPGA control DDS produce the intermediate frequency signal which reflect a variety of function wave to solve the problem above.