基于FPGA的高斯噪声数字调频算法研究与实现

Research and Implementation of Digital Frequency Modulation Algorithm with Gaussian Noise Based on FPGA

为了解决传统产生噪声调频信号方式存在稳定性差、控制精度不高、不能进行实时处理的缺点,提出一种基于FPGA(可编辑门阵列)的高斯噪声数字调频算法。此方法中高斯白噪声随机变量的产生是通过正态分布的可加性实现的,调频功能通过DDS实现,产生的信号相干性和可控性都非常严格,整个系统在FPGA(数字频率合成器)上调试完成。测试结果表明,此系统具有运算量小、速度快、可在线升级和可配置的优点,产生噪声数字调频信号不受外界环境的影响。

In order to solve the shortcomings of the traditional way of generating noise frequency modulation signal such as poor stability, low control accuracy and no real-time processing, this paper proposes digital frequency modulation algorithm with Gauss noise based on FPGA.In this method, the generation of Gaussian white noise random variable is realized by the additivity of normal distribution, and the frequency modulation function is realized by DDS. The coherence and controllability of the generated signal are very strict, and the whole system is debugging on FPGA.The test results show that the system has the advantages of small computation, fast speed, online upgrade and configurable, and the digital signal generating noisy is not affected by the external environment.