| 摘要: |
| 由于机动目标的逆合成孔径雷达（Inverse Synthetic Aperture Radar，ISAR）成像中存在多普勒扩散现象，易导致成像分辨率降低。针对此问题，在多分量三次相位信号（Cubic Phase Signal,CPS）模型基础上，提出一种基于Radon-CPF-Fourier变换（Radon-Cubic Phase Function-Fourier Transform,RCFT）的机动目标ISAR成像方法。RCFT可实现CPF中自项能量的相干积累，减轻多普勒扩散带来的影响。与现有的基于时频分析和参数估计的ISAR成像算法相比，RCFT的主副比性能提升了至少2 dB，在时频分辨率无损失时具备更好的自项能量积累能力，可获得更高质量的成像结果。仿真验证了所提方法的有效性。 |
| 关键词: 逆合成孔径雷达 机动目标 Radon-CPF-Fourier变换 时频分辨率 |
| DOI： |
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| 基金项目:装备预研领域基金项目(61404130111) |
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| ISAR Imaging of Maneuvering Targets Based on Radon-CPF-Fourier Transform |
| CHEN Qinggang,LIU Wenkui,LIANG Chenguang,YANG Junwei,YU Wei,WANG Xintao,ZENG Cao |
| (Southwest China Institute of Electronic Technonlogy,Chengdu 610036,China;Unit 61768 of PLA,Sanya 725099,China;Beijing Institude of Astronautical System Engineering,Beijing 100076,China;School of Electronic Engineering,Xidian University,Xi′an 710071,China) |
| Abstract: |
| Due to the Doppler frequency spread in the inverse synthetic aperture radar(ISAR) imaging of maneuvering targets,the imaging resolution is reduced.For the problem,based on the multi-component cubic phase signal(CPS) model,an ISAR imaging method for maneuvering targets based on Radon-Cubic Phase Function-Fourier transform(RCFT) is proposed.The coherent accumulation of auto-terms energy in cubic phase function(CPF) can reduce the impact of Doppler frequency spread.Compared with the existing ISAR imaging algorithms based on time-frequency analysis and parameter estimation,the performance of RCFT’s peak sidelobe ratio is improved by at least 2 dB.RCFT has better auto-term energy accumulation capacity without loss of time-frequency resolution,and can obtain higher quality imaging results.Simulation proves the effectiveness of the proposed method. |
| Key words: inverse synthetic aperture radar(ISAR) maneuvering targets Radon-CPF-Fourier transform(RCFT) time-frequency resolution |
《电讯技术》编辑部 