一种基于STFT的频域检测方法及FPGA实现

A Frequency Domain Detection Method Based on STFT and FPGA Implementation

针对复杂电磁环境下时域检测容易造成信号分裂,产生虚假目标,检测能力下降等问题,本文研究了基于短时傅里叶变换的频域信号检测技术。频域检测利用FFT的能量积累可以有效提高弱信号的探测能力,在复杂电磁环境下能够有效检测雷达信号。本文采用Xilinx公司的Vitex-6550T FPGA为硬件平台,利用内置的FFT IP核方便地在FPGA上实现了对离散信号的频率计算,有效完成了对脉冲信号的检测和参数测量。

Aiming at the problems of time-domain detection in complex electromagnetic environments that easily cause signal splitting,false targets,and decreased detection capabilities,this paper studies the frequency-domain signal detection technology based on short-time Fourier transform.Frequency-domain detection can effectively improve the detection ability of weak signals by using the energy accumulation of FFT,and can effectively detect radar signals in complex electromagnetic environment.In this paper,the vitex-6550T FPGA of Xilinx Company is used as the hardware platform.By using the built-in FFT IP core,the frequency calculation of discrete signal is realized on FPGA conveniently,the detection and parameters measurement of pulse signal are completed effectively.