电子学报2017，Vol.45Issue(9)：2225-2232,8.DOI:10.3969/j.issn.0372-2112.2017.09.025
一种基于相干积累CPF和NUFFT的机动目标ISAR成像新方法
A Novel ISAR Imaging Method Based on Coherent Integration CPF and NUFFT for Maneuvering Target
摘要
Abstract
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.关键词
逆合成孔径雷达/机动目标/改进的三次相位函数/非均匀快速傅里叶变换Key words
inverse synthetic aperture radar (ISAR)/maneuvering target/modified cubic phase function (MCPF)/non-uniform fast Fourier transform (NUFFT)分类
信息技术与安全科学引用本文复制引用
李东,占木杨,粟嘉,方志平,曹海林..一种基于相干积累CPF和NUFFT的机动目标ISAR成像新方法[J].电子学报,2017,45(9):2225-2232,8.基金项目
国家自然科学基金(No.61501068,No.61301120,No.51377179) （No.61501068,No.61301120,No.51377179）
重庆市前沿与应用基础研究计划(No.CSTC2015jcyjA40001) （No.CSTC2015jcyjA40001）
中央高校基金(No.106112015CDJXY500001) （No.106112015CDJXY500001）
