Welch功率谱估计算法在相位噪声测量中的应用  

Application of Welch Power Spectrum Estimation Algorithm in Phase Noise Measurement

作　　者：任全会[1] 于彦峰[1] 

机构地区：[1]郑州铁路职业技术学院电子工程系,河南郑州450052

出　　处：《自动化仪表》2014年第1期19-21,共3页Process Automation Instrumentation

摘　　要：针对传统的功率谱估计方法存在频谱分布不稳定、无法反映信号时变特性的问题,提出了一种基于Welch功率谱估计的相位噪声测量算法。该方法通过对不同的被测信号进行功率谱的估计,可以相应地选择Welch法数据分段和窗函数,并对相位噪声建立数学模型。随后对相位噪声与噪声功率谱之间的关系进行了分析。测试结果表明,该方法不但具有能适应噪声信号的随机性和脉冲性的优点,而且大大减小了噪声功率谱的均方误差,能很好地应用在相位噪声测量中。Contrary to the problems existing in traditional power spectrum estimation method, e. g. , unstable spectrum distribution and the time varying characteristics of the signal can not be reflected, the phase noise measurement method based on Welch power spectrum estimation algorithm is proposed. With this method, through estimating power spectrum of different measured signal, Welch method data segmentation and window function can be selected correspondingly, and the mathematical model of phase noise is established, then the relationship between phase noise and noise power spectrum is analyzed. The result of tests indicates that this method possesses advantages of adapting the randomness and impulsiveness of noise signals, and the mean square error of noise power spectrum is greatly decreased, it can be applied in phase noise measurement.

关 键 词：相位噪声测量 功率谱估计 WELCH法 窗函数 噪声功率谱 均方误差 

分 类 号：TN912[电子电信—通信与信息系统]