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Research on Micro-Doppler Effects in ISAR Imaging

Author: LouYongJie
Tutor: SuFuLin
School: Harbin Institute of Technology
Course: Information and Communication Engineering
Keywords: Inverse Synthetic Aperture Radar (ISAR) Micro-Doppler Effect Micro-Motion Interference Suppression
CLC: TN958
Type: Master's thesis
Year: 2009
Downloads: 99
Quote: 1
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Abstract


Inverse Synthetic Aperture Radar (ISAR) achieves two dimensional high resolutions by the combination of transmitting pulse compressed signal and Doppler resolution. If the target or any structure of the target has micro-Motions in addition to its bulk translation, those micro-Motions will induce additional modulation to the returns, which is called micro-Doppler Effect. Micro-Doppler Effect will cause difficulties to the imaging process and induce contaminations to the target’s ISAR image. On the base of turntable imaging model, micro-Doppler signatures in ISAR imaging, influence on the imaging process and suppression of micro-Motion interference were emphatically studied in this paper.Firstly, this paper gives an analysis on the Doppler Effect of micro-Motions, introduces the basic principle of micro-Doppler Effect. Based on the turntable imaging model, the motion model of micro-Motions in ISAR targets are set up, then the theoretical model of micro-Doppler Effect in ISAR imaging is derived and verified by simulations.Then, utilizing the motion model, a point–scatter simulation target with micro-Motions is set up. The returns by the micro-Motion scatter is deduced, the signature of those returns is analyzed and simulated. The influence of micro-Motions on ISAR imaging is analyzed and simulated.Finally, micro-Doppler effect suppression and extraction methods are proposed based on the difference of micro-Motion and bulk returns. Auto-correlation processing of slow-time returns can significantly improve the imaging result by suppressing the micro-Motion returns while enhancing the bulk returns; The SSA processing divides the returns into two parts: bulk returns and micro-Motion returns, then the bulk returns is compressed to get target image, while the micro-Motion returns reserves most micro-Doppler information. The validity of both methods is verified by simulation and measured data.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radar > Radar: institutional sub-
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