摘要
为了克服传统的过零检测等数字测频方法的缺点,设计了一种基于离散傅里叶变换(DFT)的快速频率测量电路,满足无源定位系统中低信噪比、高脉冲密度环境的实时频率测量的需求。阐述了基于可编程门阵列的DFT算法的实现方法及谱峰的搜索方法,给出了硬件结构形式。该算法电路结构比采用快速傅里叶变换(FFT)的算法硬件结构具有更快的测频速度。
To overcome the defects of the conventional digital frequency measurement method, such as the defects of the zero-crossing detection, a kind of high speed frequency measurement circuit using discrete Fourier transform （DFT） method is designed. It is suitable for real time frequency measurement in the passive location system on low signal-to-noise ratio and high pulse density scenarios. The implementation method of the DFT on field programmable gate array is discussed, and the circuit architecture is introduced. The DFT circuit architecture is more efficient than that of the FFT.
出处
《数据采集与处理》
CSCD
北大核心
2007年第3期370-373,共4页
Journal of Data Acquisition and Processing
关键词
无源定位
瞬时测频
离散傅里叶变换
可编程的阵列
passive location
instantaneous frequency measurement
discrete Fourier transform
programmable gate array
