摘要
对毫米波调频系统差频信号进行频谱分析时,传统的复调制细化选带频谱分析方法(Zoom FFT)计算量较大,且精度和最大细化倍数有限。为此,本文研究了一种改进的频谱细化方法。该方法在采样数据一定的情况下,对差频信号进行基于复解析带通滤波器的Zoom FFT变换,再利用最小二乘法进行连续谱的曲线拟合估计,提高了频谱估计的实时性和精度。
The calculation of traditional Zoom FFT algorithm is large.when analying the beat signal in Millimetre-wave FM system The accuracy and maximum zoom are also limited.To solve these problem,an improved method of the spectrum zoom is studied.When the sampling data is certain,the beat sinal is processed with Zoom FFT based on Multiple analytic band-pass filter.Then the discrete spectrum is fitted to the continuous spectrum with least squares.The simulation results illustrate that the improved algorithm has improved the timeliness and accuracy of spectrum estimation.
出处
《微波学报》
CSCD
北大核心
2015年第S2期212-216,共5页
Journal of Microwaves
