基于FMCW雷达的旋转目标微动参数提取方法

doi:10.12305/j.issn.1001-506X.2021.12.18

Abstract

Abstract:

The micro-Doppler frequencies of rotating targets usually overlap in the time-frequency domain, it is difficult to extract them by traditional methods. To address this issue, this paper proposes a novel micro-motion parameters extraction method for rotating targets based on frequency modulated continuous wave (FMCW) radar. Given the fact that the obtained micro-Doppler frequency is featured by sinusoidal model, a matrix based on the received signal is constructed and carried out by singular value decomposition to ensure that the singular value ratio spectrum reaches the peak value at the rotating frequency. To estimate rotating radius and initial phase, a method of calculating inverse Radon transform for the result of time-frequency analysis is proposed, which transformed the parameter estimation of sine curve into the problem of peak value detection in parameter space. The simulation and experiment data show that the proposed method can achieve high accuracy for parameter estimation in the low signal-to-noise ratio and can extract overlapped micro-Doppler frequencies effectively.

Key words: frequency modulated continuous wave (FMCW) radar, rotating targets, micro-Doppler, parameter estimation

CLC Number:

TN957

Weiting FENG, Qing LIANG, Jing GU. Micro-motion parameters extraction for rotating targets based on FMCW radar[J]. Systems Engineering and Electronics, 2021, 43(12): 3564-3570.

Figures/Tables 14

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目标	真值r/m	SNR/dB
目标	真值r/m	-6	-3	0	3	6
1	0.100	0.102	0.096	0.099	0.100	0.100
2	0.150	0.148	0.151	0.149	0.149	0.150
3	0.200	0.198	0.198	0.199	0.201	0.200

目标	真值θ₀/rad	SNR/dB
目标	真值θ₀/rad	-6	-3	0	3	6
1	0.780	0.803	0.801	0.784	0.777	0.782
2	2.870	2.893	2.855	2.867	2.873	2.869
3	4.970	4.954	4.956	4.966	4.966	4.968

目标	r/m		θ₀/rad	\|θ₀₁-θ₀₂\|/rad
目标	真值	估值	估值	真值	估值
1	0.14	0.12	2.20	3.14	3.09
2	0.14	0.12	5.29	3.14	3.09

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Micro-motion parameters extraction for rotating targets based on FMCW radar

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