论文部分内容阅读
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。
When spectrum analysis is performed on the beat signal of the millimeter-wave FM system, the conventional complex FFT spectrum analysis method (Zoom FFT) requires a large amount of calculation and has a limited precision and a maximum refinement factor. To this end, this paper studies an improved spectral refinement method. In the case of certain sampling data, this method performs complex FFT analysis on the difference frequency signal by using complex FFT method, and then uses the least square method to perform curve fitting estimation of continuous spectrum, which improves the real-time performance and accuracy of spectrum estimation .