非整周期采样下的相敏接收器相位差测量方法研究  

Research on Phase Difference Measurement Method of Phase Sensitive Receiver with Non-integer-period Sampling

作　　者：刁艳美 陈美玲[1] DIAO Yanmei;CHEN Meiling(School of Mechanical and Electrical Engineering,Nanjing Technology University Pujiang Institute)

机构地区：[1]南京工业大学浦江学院机电学院

出　　处：《仪表技术与传感器》2025年第2期109-115,共7页Instrument Technique and Sensor

基　　金：南京工业大学浦江学院校级课题(njpj2023-1-14)。

摘　　要：相敏接收器相位差计算精度容易受谐波及非整周期采样影响,不利于轨道区段状态的判断。文中提出一种非整周期的高精度相位差计算方法。首先使用简化格型自适应滤波器对采样信号进行小步长、快速收敛的滤波,求出采样信号实际频率;其次,对齐采样数据,使其整周期化;然后,对2路信号进行Hilbert变换,利用互相关函数及反三角函数得出相位差;最后,进行实验测试。结果表明:该方法能够在长持续时间下准确追踪被采样信号频率,能有效抑制端点效应,相位差计算结果误差小于0.000 1°。The accuracy of phase difference calculation in phase sensitive receivers was easily affected by harmonic and non-integer periodic sampling,which is not conducive to the judgment of track section status.A high-precision phase difference calcu-lation method for non-integer periods was proposed.Firstly,in order to obtain the actual frequency of the sampled signal,a simpli-fied lattice adaptive filter was used with small step size and fast convergence.Secondly,the sampled data were aligned to make them fully periodic.Then,Hilbert transform was performed on the two signals and the phase difference was obtained using cross-correlation functions and inverse trigonometric functions.Finally,experiments were conducted.The results show that,this method can accurately track the frequency of the sampled signal for a long duration.The endpoint effect is suppressed.The phase difference calculation error is less than 0.0001°.

关 键 词：相敏接收器 非整周期采样 相关函数 相位差计算 

分 类 号：TN70[电子电信—电路与系统]