Analytical Expression of the Time-Frequency Features of the Near-Field and Far-Field Micro-Motion Echo Based on Local Scattering Centers

ZHAN Weijie; WAN Xianrong; YI Jianxin

doi:10.11999/JEIT210565

Volume 44 Issue 8

Aug. 2022

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Article Navigation > Journal of Electronics & Information Technology > 2022 > 44(8): 2867-2877

ZHAN Weijie, WAN Xianrong, YI Jianxin. Analytical Expression of the Time-Frequency Features of the Near-Field and Far-Field Micro-Motion Echo Based on Local Scattering Centers[J]. Journal of Electronics & Information Technology, 2022, 44(8): 2867-2877. doi: 10.11999/JEIT210565

Citation:

ZHAN Weijie, WAN Xianrong, YI Jianxin. Analytical Expression of the Time-Frequency Features of the Near-Field and Far-Field Micro-Motion Echo Based on Local Scattering Centers[J]. Journal of Electronics & Information Technology, 2022, 44(8): 2867-2877. doi: 10.11999/JEIT210565

Citation:

ZHAN Weijie, WAN Xianrong, YI Jianxin. Analytical Expression of the Time-Frequency Features of the Near-Field and Far-Field Micro-Motion Echo Based on Local Scattering Centers[J]. Journal of Electronics & Information Technology, 2022, 44(8): 2867-2877. doi: 10.11999/JEIT210565

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Analytical Expression of the Time-Frequency Features of the Near-Field and Far-Field Micro-Motion Echo Based on Local Scattering Centers

doi: 10.11999/JEIT210565 cstr: 32379.14.JEIT210565

School of Electronic Information, Wuhan University, Wuhan 430072, China

Funds: The National Natural Science Foundation of China (61931015, 62071335, 61831009), The Technological Innovation Project of Hubei Province (2019AAA061), The Science and Technology Planning Project of Shenzhen (JCYJ20170818112037398)

Received Date: 2021-06-11
Rev Recd Date: 2022-03-17

Available Online: 2022-04-12

Publish Date: 2022-08-17

Abstract

Abstract

Micro-Doppler effect is a frequency modulation phenomenon caused by the rotation, vibration, precession or other micro-motions of targets (or their components), which is able to reflect the geometric structure and motion state of the target. In this paper, the time-frequency distribution characteristics of micro motion echo induced by the rotation of target fan blades under near-field and far-field conditions are analyzed comprehensively. First, the signal models of the near-field and far-field radar micro motion echo are established. Then, the instantaneous frequencies are derived from the signal model of the far-field micro motion echo. The results show that the spectrogram of the far-field micro motion echo is composed of the sinusoidal flashes, zero-frequency flash, and rectangular flashes induced by the tip scattering points, hub scattering points, and mirror reflection points, respectively. Finally, the instantaneous frequencies corresponding to the above three kinds of local scattering points under near-field condition are directly derived, which indicates that the spectrogram of the near-field micro motion echo behaves as the combination of the sine-like flashes, zero-frequency flash, and partial cosine flashes. The formation mechanisms about the above flashes are explained from the perspectives of the integral operation properties and electromagnetic scattering theories. Also, the relationship between the flashes and the number, size, rotation velocity of the blades is revealed. This paper will be helpful to the applications of target fine modeling, target classification and recognition. The correctness of the analyses is validated by simulated and field experimental data.
- Radar,
- Micro-Doppler effect,
- Micro-motion,
- Time-frequency features,
- Near-field detection

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References(29)

References

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