高速机动目标多普勒解模糊高分辨成像方法

doi:10.13700/j.bh.1001-5965.2019.0648

北京航空航天大学学报 ›› 2021, Vol. 47 ›› Issue (1): 150-158.doi: 10.13700/j.bh.1001-5965.2019.0648

高速机动目标多普勒解模糊高分辨成像方法

刘丰恺¹, 冯存前¹, 黄大荣¹, 郭新荣², 韩立珣¹

1. 空军工程大学防空反导学院, 西安 710051;
2. 武警工程大学基础部, 西安 710086

收稿日期:2019-12-29 发布日期:2021-01-29
通讯作者: 黄大荣 E-mail:rsphdr@163.com
作者简介:刘丰恺,男,硕士研究生。主要研究方向:ISAR成像及自聚焦;冯存前,男,博士,教授,博士生导师。主要研究方向:目标探测与识别、雷达信号处理;黄大荣,男,博士,讲师。主要研究方向:雷达总体设计、雷达成像及运动补偿;郭新荣,女,硕士,讲师。主要研究方向:ISAR成像及运动补偿;韩立珣,男,博士研究生。主要研究方向:雷达信号处理。
基金资助:
国家自然科学基金（61701528）；陕西省自然科学基金（2019JQ-497）；中国博士后科学基金（2019M661508）；空军工程大学校长基金（XZJK2019030）

High-resolution imaging algorithm of high-speed maneuvering target with Doppler ambiguity removal

LIU Fengkai¹, FENG Cunqian¹, HUANG Darong¹, GUO Xinrong², HAN Lixun¹

1. Air and Missile Defense College, Air Force Engineering University, Xi'an 710051, China;
2. Department of Basic Course, Engineering University of CAPF, Xi'an 710086, China

Received:2019-12-29 Published:2021-01-29

摘要/Abstract

摘要： 针对目标高速机动导致ISAR成像结果产生距离徙动（MTRC）和多普勒模糊的问题，提出一种新的高速机动目标ISAR成像方法，用于解算距离徙动下的多普勒模糊难题。首先，将原始信号变换至图像域，提取最强散射点，估计该点对应的信号调频率，并基于图像最大对比度准则估计多普勒模糊数。然后，重构回波信号的同时矫正距离徙动，并利用CLEAN技术降低运算量和减小噪声对成像结果的影响，获得高速机动目标无模糊的高分辨ISAR图像。仿真实验结果证明了所提方法的有效性和低信噪比下的强鲁棒性。

关键词: ISAR成像, 多普勒解模糊, 距离徙动(MTRC)矫正, 高速机动目标, CLEAN技术

Abstract: A new ISAR imaging algorithm for high-speed maneuvering target is proposed to solve the Doppler ambiguity problem under Migration Through Range Cells (MTRC). First, the algorithm transforms the original signal to the image domain, then extracts the strongest scattering point, estimates the chirp rate of the point, and estimates the Doppler ambiguity number based on the maximum contrast criterion of the image. The next step is reconstructing the echo signal, correcting the MTRC, and using CLEAN technology to reduce computation and the impact of noise on imaging results. Finally, a high-resolution ISAR image without ambiguity for high-speed maneuvering target is obtained. The simulation results prove the algorithm's effectiveness and strong robustness under conditions of low signal-to-noise ratio.

Key words: ISAR imaging, Doppler ambiguity removal, Migration Through Range Cells (MTRC) compensation, high-speed maneuvering target, CLEAN technology

中图分类号:

刘丰恺, 冯存前, 黄大荣, 郭新荣, 韩立珣. 高速机动目标多普勒解模糊高分辨成像方法[J]. 北京航空航天大学学报, 2021, 47(1): 150-158.

LIU Fengkai, FENG Cunqian, HUANG Darong, GUO Xinrong, HAN Lixun. High-resolution imaging algorithm of high-speed maneuvering target with Doppler ambiguity removal[J]. Journal of Beijing University of Aeronautics and Astronautics, 2021, 47(1): 150-158.

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高速机动目标多普勒解模糊高分辨成像方法

High-resolution imaging algorithm of high-speed maneuvering target with Doppler ambiguity removal

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