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

LI Dong; ZHAN Mu-yang; SU Jia; FANG Zhi-ping; CAO Hai-lin

doi:10.3969/j.issn.0372-2112.2017.09.025

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

更新时间：2025-07-16

- A Novel ISAR Imaging Method Based on Coherent Integration CPF and NUFFT for Maneuvering Target
- Acta Electronica Sinica Vol. 45, Issue 9, Pages: 2225-2232(2017)
- 作者机构：
  
  1. 重庆大学飞行器测控与通信教育部重点实验室,重庆,400044
  2. 西北工业大学电子信息学院,陕西,西安,710072
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China (No.61501068, No.61301120, No.51377179);Frontier and Applied Basic Research Project of Chongqing Municipality (No.CSTC2015jcyjA40001);Funds for the Central Universities (No.106112015CDJXY500001)
- DOI：10.3969/j.issn.0372-2112.2017.09.025
  CLC： TN957
- Published Online：25 September 2017，
  
  Published：2017
- 稿件说明：
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LI Dong, ZHAN Mu-yang, SU Jia, et al. A Novel ISAR Imaging Method Based on Coherent Integration CPF and NUFFT for Maneuvering Target[J]. Acta Electronica Sinica, 2017, 45(9): 2225-2232.
DOI：

LI Dong, ZHAN Mu-yang, SU Jia, et al. A Novel ISAR Imaging Method Based on Coherent Integration CPF and NUFFT for Maneuvering Target[J]. Acta Electronica Sinica, 2017, 45(9): 2225-2232. DOI： 10.3969/j.issn.0372-2112.2017.09.025.

摘要

机动目标的复杂运动导致散射体回波信号多普勒频率时变，给逆合成孔径雷达（ISAR）成像方位向处理带来困难.而传统的距离-多普勒（RD）成像方法、Wigner-Ville distribution（WVD）瞬时成像方法、Radon-Wigner等成像方法由于成像效果差或运算效率低等因素，不适合复杂运动目标的ISAR实时成像.针对这些问题，本文提出了一种基于相干积累三次相位函数（CPF）的机动目标ISAR成像新方法.首先，把平动补偿后的各距离单元数据，通过CPF变换到时间-调频率平面.然后，利用各散射体自项能量平行于时间轴分布特性，提出一种基于相干积累的交叉项和虚假伪峰抑制方法，进而得到各散射体在频率-调频率平面的高分辨分布特性.最后，通过向频率轴上的投影得到该距离单元目标的方位ISAR图像，并通过引入非均匀快速傅立叶变换（NUFFT）来降低算法计算复杂度.计算机仿真处理结果验证了该方法的有效性.

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.

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