A Novel ISAR Imaging Method Based on Coherent Integration CPF and NUFFT for Maneuvering Target

被引：0
|
作者：
Li D. [1 ]
Zhan M.-Y. [1 ]
Su J. [2 ]
Fang Z.-P. [1 ]
Cao H.-L. [1 ]
机构：
[1] Key Laboratory of Aerocraft Tracking Telemetering & Command and Communication, Ministry of Education, Chongqing University, Chongqing
[2] School of Electronics and Information, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi
来源：
| 1600年 / Chinese Institute of Electronics卷 / 45期
关键词：
Inverse synthetic aperture radar (ISAR); Maneuvering target; Modified cubic phase function (MCPF); Non-uniform fast Fourier transform (NUFFT);
D O I：
10.3969/j.issn.0372-2112.2017.09.025
中图分类号：
学科分类号：
摘要：
The azimuth time-varying Doppler frequency, caused by the complex movement of maneuvering target, deteriorates the azimuth focusing quality. Conventional Range-Doppler (RD) imaging algorithm, Wigner-Ville distribution (WVD) imaging algorithm and Radon-Wigner imaging algorithm, due to Poor image quality and inefficient operation and so on, are unfit for ISAR imaging of the complex motion target. To solve these problems, a novel ISAR imaging method based on coherent integration cubic phase function (CPF) for maneuvering target is proposed in the letter. First, the echo data in a range bin after translational compensation are transformed into the time-chirp rate plane via CPF. Then, the auto-terms energy can be coherently integrated in the time-chirp rate distribution plane and can effectively suppress the troublesome cross-term interference and spurious peaks, and then obtain the distribution of the scatter energy in frequency-chirp rate plane. Finally, the azimuth ISAR image can be obtained via a simple maximization projection from the two-dimensional accumulated plot to the azimuth dimension, and the non-uniform fast Fourier transform (NUFFT) is also adopted to reduce the computing complexity. Computer simulation results verify the effectiveness of the proposed method. © 2017, Chinese Institute of Electronics. All right reserved.
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页码：2225 / 2232
页数：7
相关论文
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