Overview of Radio Frequency Fingerprint Extraction in Specific Emitter Identification(in English)
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摘要: 辐射源个体识别是一种仅通过信号的外部特征测量手段,提取辐射源指纹特征,从而识别发射给定信号的特定辐射源个体的技术。近年来,辐射源个体识别技术相关理论与实践应用不断完善,指纹特征提取方法的研究取得了较大的进展。该文在分析国内外大量学术研究成果的基础上,从指纹特征的内在逻辑出发提出了一种新的特征框架。该框架根据不同特征对辐射源指纹的描述特性以及相互之间的关联,将指纹特征划分为直接测量特征和降维变换特征两大类共3个层次,并系统性地梳理了辐射源指纹特征提取方法的研究现状。最后,该文对辐射源指纹特征提取的几个潜在研究方向进行了分析和展望, 希望对辐射源个体识别的研究和应用有所裨益。Abstract: Specific emitter identification is a technique of extracting the radio frequency fingerprints of the received electromagnetic signal only using external feature measurements to determine the specific emitter that transmits the signal. In recent years, the related theories and practical applications of specific emitter identification have been continuously improved, and research on radio frequency fingerprinting feature extraction methods has made great progress. Based on the domestic and foreign academic achievements, this paper systematically reviews the status quo of the fingerprint feature extraction method of specific emitter identification. In addition, a new feature classification framework is proposed based on the inherent logic of fingerprint feature extraction. The classification framework combines the description characteristics of different radio frequency fingerprinting features and the correlation between them. It divides the existing radio frequency features into two main categories: direct measurement features and dimensionality reduction transform features, which have three levels. Finally, this paper analyzes and explores several potential research directions of fingerprint feature extraction, aiming to benefit the research and application of specific radiation source identification.
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图 1 Structural diagram of typical system for specific emitter identification[1]
表 1 基于指纹分析内在逻辑的指纹特征分类框架下的直接测量特征
Table 1. Direct measurement features under the feature framework based on the inherent logic of fingerprint feature extraction
特征方法 相关文献 基本参数信息 常规参数 文献[1,11,12] 包络特性 文献[13—18] 瞬时特性 文献[19—23] 调制参数 文献[24—26] 频谱分布 文献[3—27] 基本变换信息 时频谱 文献[28—32] 高阶谱 文献[33—37] 循环谱 文献[38,39] Hilbert谱 文献[40—43] 信号特殊结构 信号导头 文献[23,44,45] 雷达信号分析 文献[46–51] 分解重构信息 经验模态分解 文献[42,43,52—55] 固有时间尺度分解 文献[56—63] 变分模态分解 文献[9,43,64,65] 相空间重构 文献[2,66—69] 信号分割重构 文献[70—71] 发射机硬件特性 等效电路 文献[72] 非线性电路 文献[73] 频率源 文献[74] 表 2 基于指纹分析内在逻辑的指纹特征分类框架下的降维变换特征
Table 2. Dimensionality reduction feature under feature framework based on the inherent logic of fingerprint feature extraction
表 1 Direct measurement features under the feature framework based on the inherent logic of fingerprint feature extraction
Feature method Reference Basic parameter information General parameter [1,11,12] Envelope feature [13–18] Instantaneous feature [19–23] Modulation parameter [24–26] Spectrum feature [3–27] Basic transformation
informationTime-frequency analysis [28–32] High-order spectrum [33–37] Cyclic spectrum [38,39] Hilbert spectrum [40–43] Signal special structure
Signal preamble [23,44,45] Radar signal analysis [46–51] Decomposition and
reconstruction informationEMD [42,43,52–55] ITD [56–63] VMD [9,43,64,65] Phase space analysis [2,66–69] Segmentation reconstruction [70,71] Transmitter hardware characteristics Equivalent circuit model [72] Nonlinear circuit model [73] Frequency source circuit [74] 表 2 Dimensionality reduction feature under feature framework based on the inherent logic of fingerprint feature extraction
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