CHEN Zhi-kun1, LI Sheng1, CHEN Tao2, et al. Design and realization of DFT spectrum analysis system based on FPGA[J]. 2010, 29(8): 113-116. DOI: 10.13873/j.1000-97872010.08.019.
DFT频谱分析系统的FPGA设计与实现
摘要
设计与实现了一种基于FPGA的DFT频谱分析系统。系统对16384点采样数据进行处理
信号频谱分辨率带宽RBW达到30 kHz。相同条件下
与FFT快速频谱算法相比
采用DFT设计占用芯片资源少
降低了设计成本。设计中采用NCO IP Core实时计算正弦和余弦样本
而不需要样本存储器
节省了ROM资源。同时
系统采用流水线工作方式
每场数据处理时间为22 ms
保证了系统的处理速度
实时性较好。本系统已成功应用于实际工程之中。
Abstract
A discrete Fourier transform(DFT) spectrum analysis system based on field programmable gate arrays(FPGA)has been designed and realized.This system deal with 16384 points sampled data
signal spectral RBW reach to 30KHz.Compared with the FFT
DFT algorithm occupies less chip resources and reduces design cost.In the design
a NCO IP Core is used to calculate the Sin and Cos Samples instead of samples memory.The entire design adopts pipeline architecture to ensure the system’s speed and reduce the waste of time
processing time is 22ms.The system has been successfully used in practical engineering.