通信学报 ›› 2018, Vol. 39 ›› Issue (8): 106-112.doi: 10.11959/j.issn.1000-436x.2018132

• 论文Ⅱ:学术论文 • 上一篇    下一篇

针对特定辐射源识别的高精度符号同步方法

潘一苇,彭华,李天昀,王文雅   

  1. 信息工程大学信息系统工程学院,河南 郑州 450001
  • 修回日期:2018-04-09 出版日期:2018-08-01 发布日期:2018-09-13
  • 作者简介:潘一苇(1990-),男,山东青岛人,信息工程大学博士生,主要研究方向为通信信号处理、特定辐射源识别等。|彭华(1973-),男,江西萍乡人,信息工程大学教授、博士生导师,主要研究方向为软件无线电和通信信号处理。|李天昀(1979-),男,江西萍乡人,信息工程大学副教授、硕士生导师,主要研究方向为软件无线电、通信信号处理等。|王文雅(1991-),女,湖北天门人,信息工程大学硕士生,主要研究方向为通信信号处理。
  • 基金资助:
    国家自然科学基金资助项目(61401511)

High-precision symbol timing algorithm for specific emitter identification

Yiwei PAN,Hua PENG,Tianyun LI,Wenya WANG   

  1. Institute of Information Systems Engineering,Information Engineering University,Zhengzhou 450001,China
  • Revised:2018-04-09 Online:2018-08-01 Published:2018-09-13
  • Supported by:
    The National Natural Science Foundation of China(61401511)

摘要:

对于特定辐射源识别的预处理环节,现有符号同步方法存在时延估计方式不妥和插值计算精度不足的问题。针对该问题,提出一种高精度的符号同步方法。对于时延估计,采用2步估计的方式,先由前向算法得到粗估计值,再利用解调得到的发送符号通过局部搜索得到精确值。对于插值计算,利用窗化法对插值滤波器进行优化设计,改善了滤波器的抗混叠特性,提高了计算精度。仿真实验表明,与常规符号同步算法相比,该算法能有效解决以上问题,且能在辐射源识别中取得更优的识别效果。

关键词: 特定辐射源识别, 高精度, 符号同步, 时延估计, 插值滤波器

Abstract:

The existing symbol timing algorithms have the problems that the method of delay estimation is improper and the calculation precision of the interpolation is insufficient for the pretreatment of specific emitter identification.A high-precision symbol timing algorithm was proposed to solve these problems.Aiming at the former problem,a two-step estimation method was adopted,rough estimation of delay was firstly obtained by the forward algorithm,and then the accurate value was acquired through local search with the demodulated symbols.For the latter problem,a window-based approach was used to design an interpolating filter which could optimize the anti-aliasing characteristics and improve the calculation accuracy.Simulation results show that the proposed algorithm can effectively solve the above problems and achieve better recognition results in the radiation source recognition compared with the conventional symbol timing algorithm.

Key words: specific emitter identification, high precision, symbol timing, delay estimation, interpolating filter

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