摘 要:在进行多分量信号瞬时频率估计时,存在较大误差,为此提出基于二维DFT 的多分量信号瞬时频率估计方法。首先通过建立多分量信号模型获取到多分量信号瞬时频率的相参特性,然后利用二维DFT 技术对多分量信号脉冲特性进行变换,最后利用加权均值的方法求出多分量信号瞬时频率,以此完成基于二维DFT 的多分量信号瞬时频率估计。经实验证明,设计方法估计误差小于传统方法。
关键词:二维DFT;多分量信号;瞬时频率;估计
中图分类号:TN911.72 文献标识码:A 文章编号:2096-4706(2020)23-0058-03
Instantaneous Frequency Estimation Method of Multicomponent Signals Based on Two-Dimensional DFT
XIE Hao
(Henan University,Kaifeng 475004,China)
Abstract:There is a big deviation in the instantaneous frequency estimation of multicomponent signals,so a method of instantaneous frequency estimation of multicomponent signals based on two-dimensional DFT is proposed. Firstly,the coherent characteristics of the instantaneous frequency of the multicomponent signal are obtained by establishing the multicomponent signal model. Then,the pulse characteristics of the multicomponent signal are transformed by using the two-dimensional DFT technology. Finally,the instantaneous frequency of the multicomponent signal is obtained by using the weighted average method,so as to complete the instantaneous frequency estimation of the multicomponent signal based on the two-dimensional DFT. The experimental results show that the estimation error of the design method is smaller than that of the traditional method.
Keywords:two-dimensional DFT;multicomponent signal;instantaneous frequency;estimation
参考文献:
[1] 曹伟浩,姚直象,夏文杰,等. 基于插值短时分数阶傅里叶变换- 变权拟合的线性调频信号参数估计 [J]. 兵工学报,2020,41(1):86-94.
[2] 康德,马增强,李响,等. 基于Steger 算子的非平稳信号瞬时频率估计方法 [J]. 济南大学学报( 自然科学版),2020,34(4):335-341+349.
[3] 胡瑾贤,高墨昀,王金锋. 外场条件下辐射源脉内瞬时频率特征提取与个体识别有效性分析 [J]. 舰船电子对抗,2020,43(2):70-74.
[4] 王增科,赵加祥,徐微,等. 一种低信噪比条件下的瞬时频率估计算法 [J]. 东南大学学报( 自然科学版),2020,50(4):684-688.
[5] 生雪莉,穆梦飞,殷敬伟,等. 基于稀疏分解的水下运动目标多普勒频移估计方法[J]. 哈尔滨工程大学学报,2020,41(10):1429-1435.
[6] 赵红梅,崔艳. 一种基于新误差标准的ANF 线性调频信号参数估计方法 [J]. 山西师范大学学报( 自然科学版),2019,33(1):66-72.
[7] 翟华,茆弘民,左根明,等. 融合KFCM 及频谱质心的瞬时频率估计算法研究 [J]. 电子测量与仪器学报,2019,33(7):1-10.
作者简介:谢好(2001.01—),女,汉族,山东菏泽人,本科在读,研究方向:电子信息科学与技术。