摘要
为解决相位差法中频谱校正的问题,提出一种基于FFT最大谱线处相位差的离散频谱加权校正算法。从频谱次大值的相位差入手,将最大值误差与次大值误差进行加权校正,首先通过对相位差中最高值校正误差与次高值校正误差的结果分析,再按一定比例将最高值误差校正与次大之误差校正进行加权,并对加权校正结果进行对比。实验结果表明,该方法与传统相位差法相比,在频谱最高值相同的情况下,频率校正误差的频率分辨率提高了90%,提高了频率校正精度。
In order to solve the problems of spectrum correction in phase difference, a weighted correction algorithm which proceeds from phase difference correction is proposed. According to the result of the largest value correction and the second largest value in phase difference, the weighted correction method is determined. Since not only the main peak spectrum line but also the second peak spectrum are considered in some radios. Then variance on calibration results are analized. The results show that the method can improve the precision of frequency correction compared with the traditional method, and under the condition of the same spectrum peak, the frequency resolution of frequency calibration error is increased by 90 %.
出处
《控制工程》
CSCD
北大核心
2017年第5期1086-1089,共4页
Control Engineering of China
基金
山东省高等学校科技计划项目(J14LN20)
关键词
次高值
相位差
频谱校正
加权算法
Secondary largest value
phase difference
spectrum correction
weighting algorithm
