基于相关系数导数的余弦信号检相算法  

Cosine signal phase detection algorithm based on correlation coefficient derivative

作　　者：韦鉴熊[1,2] 王治强[1] 刘薇[1] 

机构地区：[1]中国科学院光电研究院,北京100094 [2]中国科学院研究生院,北京100049

出　　处：《仪器仪表学报》2011年第6期1265-1271,共7页Chinese Journal of Scientific Instrument

摘　　要：检相方法的精度受到采样条件影响时,通常无法满足相位式激光测距的高精度检相需求。介绍了等相位信号具有极大相关系数的特性,分析该特性与待测相位的关系,提出了基于相关系数导数的检相算法;分析基于离散傅里叶变换的滤波方法,为算法提供了噪声干扰信号的检相策略。最后通过模拟计算验证了算法的可行性,分析了算法的检相误差。计算表明该算法具有精度高和不受采样条件影响的特点,无论有无噪声干扰,算法的检相精度都优于相关函数法。The precision of phase detection algorithm does not meet the requirement of high precision phase detection in phase-shift laser range-finder,because the precision of the algorithm is influenced by sampling conditions.This paper firstly introduces the characteristic that the correlation coefficient of two same phase signals reaches maximum,analyzes the relationship between the characteristic and detected phase,then proposes a phase detection algorithm based on correlation coefficient derivative;secondly analyzes the filtering method based on Discrete Fourier Transform,provides the phase detection strategy for dealing with noise interference signal.Finally,through simulative computation,the feasibility of the proposed algorithm is verified and the phase detection error is analyzed.Computation results indicate that the phase detection precision of the proposed algorithm is not influenced by sampling conditions and is higher than that of correlation function method no matter noise interference exists or not.

关 键 词：相关系数 采样 估计区间 DFT滤波 

分 类 号：TB22[天文地球—大地测量学与测量工程]