基于改进型快速双线性参数估计的复杂运动目标ISAR成像

吕倩; 苏涛

doi:10.11999/JEIT151359

基于改进型快速双线性参数估计的复杂运动目标ISAR成像

doi: 10.11999/JEIT151359

吕倩¹,
苏涛¹

基金项目:

国家自然科学基金(61271024, 61201283)，新世纪优秀人才支持计划(NCET-09-0630)

计量
- 文章访问数: 1332
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- 被引次数: 0
出版历程
- 收稿日期: 2015-12-03
- 修回日期: 2016-05-04
- 刊出日期: 2016-09-19

ISAR Imaging of Targets with Complex Motion Based on the Modified Fast Bilinear Parameter Estimation

Lü Qian¹,
SU Tao¹

Funds:

The National Natural Science Foundation of China (61271024, 61201283), Program for New Century Excellent Talents in University (NCET-09-0630)

摘要

摘要: 针对复杂运动目标的逆合成孔径雷达(ISAR)成像中多普勒扩散导致的成像质量下降，该文在建立方位回波信号为立方相位信号(CPS)的基础上，提出一种基于改进型快速双线性参数估计的复杂运动目标ISAR成像方法。该方法通过利用双线性立方相位函数，非均匀快速傅里叶变换(NUFFT)，基于Chirp-z的尺度变换以及快速傅里叶变换(FFT)等操作，能够快速实现CPS参数估计和复杂运动目标的ISAR成像。由于实现过程均采用NUFFT和FFT快速实现，该方法计算量小，并且双线性操作可以保证其具有较好的抗噪声性能和交叉项抑制性能。理论分析和仿真结果验证了该ISAR成像算法的有效性。
- 逆合成孔径雷达 /
- 立方相位信号 /
- 参数估计 /
- 非均匀快速傅里叶变换
Abstract: In view of image defocus caused by Doppler frequency shift in ISAR imaging of targets with complex motion, this paper characterizes the azimuth echoes as Cubic Phase Signal (CPS) and proposes an ISAR imaging algorithm for targets with complex motion based on the modified fast bilinear parameter estimation. This algorithm can achieve parameter estimation of CPS and ISAR imaging quickly by employing the cubic phase bilinear function, NonUniform Fast Fourier Transform (NUFFT), scale transform based on Chirp-z transform and Fast Fourier Transform (FFT). The computational cost is low due to the NUFFT and FFT in implementation procedure, and bilinearity guarantees a high anti-noise performance and a good suppression on cross-terms. The theoretical analysis and simulation results demonstrate the effectiveness of the proposed ISAR imaging algorithm.
- Inverse SAR (ISAR) /
- Cubic Phase Signal (CPS) /
- Parameter estimation /
- NonUniform Fast Fourier Transform (NUFFT)

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参考文献(21)

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