正弦信号四参数的高精度估计算法  

High-accuracy estimation algorithm for 4 parameters of sine-wave

作　　者：吴义华[1] 杨俊峰[1] 程敬原[1] 曹平[1] 

机构地区：[1]中国科学技术大学近代物理系快电子学实验室,安徽合肥230026

出　　处：《中国科学技术大学学报》2006年第6期625-629,共5页JUSTC

基　　金：国家高技术研究发展计划(863计划)(2001AA602011);安徽省高校"物理电子学"省级重点实验室资助

摘　　要：从正弦信号的任意间隔采样序列出发,结合频率的迭代法估计和幅度、相位以及直流偏移的最小二乘法估计,提出了估计正弦信号四个参数(幅度、频率、相位以及直流偏移)的新算法,即四参数估计法,并与直接快速傅立叶变换法和通用相位差法就估计精度进行了仿真比较.结果表明,四参数估计法不但精度较高、抗噪声能力较强,而且能对非等间隔采样信号进行参数估计.A new algorithm named 4-parameter estimation algorithm was proposed to estimate the four parameters of sine-wave, namely, amplitude, frequency, phase and DC offset, from a sampled sequence with random sample intervals, based on the frequency estimation with iterated algorithm and amplitude, phase and DC offset estimation with least square algorithm. Simulations were performed to compare the estimation precision of the proposed algorithm with the two existing algorithms：direct FFT algorithm and universal phase difference correcting algorithm. The simulation results indicate that 4-parameter estimation algorithm not only has a higher precision and noise immunity, but also can deal with parameter estimation from random sample interval sequences compared with the other two algorithms.

关 键 词：频率 相位 正弦信号 四参数估计法 通用相位差法 

分 类 号：TN911.72[电子电信—通信与信息系统]