宽带噪声调频信号产生系统的数字化硬件实现

Digital hardware implementation of broadband noise FM signal generator system

宽带高精度的噪声调频信号在现代电子干扰系统中应用广泛。传统的模拟或半数字化的噪声调频信号产生方式容易受到温度等环境因素的影响,已无法满足现代电子战中对噪声调频信号的要求。提出了一种新型的噪声调频信号产生方式,基于现场可编程门阵列FPGA的全数字化实现架构,通过直接数字频率合成DDS技术实现。FPGA的时序分析结果表明,该系统主频到达了250MHz以上。对硬件实现电路的测试结果表明,该系统能够产生带宽超过300MHz、带宽调整精度5kHz以内的噪声调频信号。

Broadband noise frequency modulation signal with high precision is commonly used in modern electronic interference system. The traditional way to generate a noise FM signal is usually based on analog or semi-digital technique,which can not meet the requirement of the modern EW because they are easily affected by the environment factor such as temperature. A new method is put forward to generate a noise FM signal, which is based on FPGA and DDS technique. The result of the timing analysis indicates that the frequency of the FPGA system clock reaches more than 250MHz. Moreover, the bandwidth of the noise FM signal generated by the PCB is more than 300MHz,and the control precision of the bandwidth reaches less than 5 kHz.