基于FPGA的宽带噪声发生器的设计

随着宽带雷达信号的不断发展,需要宽带的噪声干扰信号.提出了一种宽带数字高斯白噪声产生的方法,通过FPGA并行产生4路m序列,并使用多相滤波技术进行滤波,然后将4路信号合成2路信号输入到DAC,最后进行放大滤波得到模拟的宽带白噪声.设计的核心是多路m序列发生和FIR多相滤波器,详细分析了多路m序列发生算法和FIR多相滤波算法.应用Verilog HDL语言实现模块功能性设计,该系统采用Stratix Ⅳ芯片EP4SGX230和双输入高速数模转换器AD9739,可实现宽带噪声的输出.

Design of broad band noise generator based on FPGA

With the continuous increment of wideband radar signal,we need broadband noise signal. This paper presents a method of wideband digital Gaussian white noise, which by using the FPGA generates four parallel m-sequence, and using polyphase filtering technique for filtering,and then synthesize the two signals and input to the DAC,and finally get amplified and filtered to achieve a broadband white noise. The core of the design is the m svquence generation and the FIR polyphase filter,This paper give a detailed analysis of multi-channel m-sequence gencration algorithm and FIR polyphase filter. Applied Verilog HDL to relize the module functional design, the system uses Stratix IV chip EP4SGX230 and dual input high speed DAC AD9739, can achieve broad band noise output.