A Fast Signal Parameter Estimation Algorithm for Linear Frequency Modulation Signal under Low Signal-to-Noise Ratio Based on Fractional Fourier Transform

被引：4

作者：

Liu Limin ^{[1
]}

Li Haoxin ^{[2
]}

Li Qi ^{[2
]}

Han Zhuangzhi ^{[1
]}

Gao Zhenbin ^{[2
]}

机构：

[1] Army Engn Univ, Dept Elect & Opt Engn, Shijiazhuang 050003, Hebei, Peoples R China

[2] Hebei Univ Technol, Sch Elect Informat Engn, Tianjin 300401, Peoples R China

来源：

JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY | 2021年 / 43卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Linear Frequency Modulation (LFM)signal; Effective FRactional Fourier Transform (FRFT); Fourth order origin moment of fractional spectrum; Low Signal-to-Noise Ratio (SNR); CANONICAL WIGNER DISTRIBUTION; LFM;

D O I：

10.11999/JEIT200973

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

An algorithm based on high-efficiency FRactional Fourier Transform (FRFT) and fourth-order origin moments in the fractional-domain spectrum is proposed to estimate quickly the chirp signal at low signal-to-noise ratio. Firstly, the initial interval of the rotation order is determined by the sign of the FM slope. Then, the rotation order is estimated roughly by the efficient FRFT algorithm. Finally, the search interval and step size are determined according to the fourth-order origin moments of the spectrum in the fractional-domain. The simulation results show that the Linear Frequency Modulation (LFM) signal can be detected under low signal-to-noise ratio and the parameters of the signal can be estimated accurately using this algorithm, and the signal can be detected with a small amount of calculation.

引用

页码：2798 / 2804

页数：7

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