复合微多普勒信号的时频谐波分析方法

doi:10.12305/j.issn.1001-506X.2024.07.14

Abstract

Abstract:

In the time-frequency analysis of the echoes from targets with composite micro-motions, there is a problem that the energy of time-frequency strip is difficult to focus, which affects the extraction and analysis of the target's micro-Doppler feature. To solve this problem, this paper proposes the concept of time-frequency harmonic stripes and corresponding time-frequency transformation methods. Based on the assumption that the composite micro-motions include central motion components and high-frequency motion components, firstly, spline function is used to fit the frequency curve of the central motion component, and therefore construct the time-frequency transform kernel is constructed. Then, parameterized time-frequency transform is used to convert the composite micro-Doppler signal in the time domain to harmonic stripes on the time-frequency plane. Compared with traditional methods such as short-time Fourier transform and pseudo Wigner-Ville distribution, the proposed method can significantly improve the energy aggregation and spur suppression of time-frequency transform of radar echoes from composite micro-motion targets. Simulation results verify the effectiveness of the proposed method and its adaptability to low signal-to-noise ratio (SNR) conditions.

Key words: radar, micro-motion, time-frequency analysis, micro-Doppler, harmonic wave

CLC Number:

TN95

Yuming HUA, Dongya WANG, Tianlin ZHU, Sheng JIN, Yang WANG. Time-frequency harmonic wave analysis method of composite micro-Doppler signals[J]. Systems Engineering and Electronics, 2024, 46(7): 2301-2309.

Figures/Tables 13

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参数	取值
锥旋角1(β₁/(°))	10
锥旋角速度1(ω₁/(rad·s^-1))	3π
锥旋初相1(φ₁/(°))	0
平均视线角(α/(°))	110
锥旋角2(β₂/(°))	1
锥旋角速度2(ω₂/(rad·s^-1))	40π
锥旋初相2(φ₂/(°))	0

方法	最大杂散幅度/dB		杂散数量
方法	t_m=0.5 s	t_m=1.076 s	t_m=0.5 s	t_m=1.076 s
STFT	－0.27	－3.6	21	5
SPWV	－3.3	－2.3	39	45
C-GPTF	－7.5	－7.5	7	2

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Time-frequency harmonic wave analysis method of composite micro-Doppler signals

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