基于Hilbert变换的高精度测频研究  

Research into High Precision Frequency Measurement Based on Hilbert Transform

作　　者：何洋炎 王林 HE Yang-yan;WANG Lin(The 51st Research Institute of CETC,Shanghai 201802,China)

机构地区：[1]中国电子科技集团公司第五十一研究所,上海201802

出　　处：《舰船电子对抗》2023年第3期85-88,共4页Shipboard Electronic Countermeasure

摘　　要：分析了一种脉冲信号频率精细测量方法。依托希尔伯特变换,并通过对其变换后信号的正交性与瞬时测频误差之间关系建立联系,分析了信号采样点之间相位相似性,重构入射信号模型并得到瞬时频率或调频斜率的数值。通过仿真分别给出了点频信号与线性调频信号频率参数的测量结果,结果表明该方法可以提供较高的测频精度,能满足工程上目标细微特征识别的需求。This paper analyzes a precise measurement method of pulse signal frequency,establishes a relationship between the orthogonality of transformed signals and the instantaneous frequency measurement error based on the Hilbert transform,analyzes the phase similarity among signal sampling points,reconstructs the incident signal model,and obtains the instantaneous frequency or frequency modulation slope value.The measurement results of frequency parameters of point frequency signals and linear frequency modulation signals are given through simulation respectively.The results show that the proposed method can provide high frequency measurement accuracy and meet the requirements of target fine feature recognition in the engineering application.

关 键 词：脉冲频率测量 相似性 目标特征识别 

分 类 号：TN971.1[电子电信—信号与信息处理]