高速机动目标多普勒解模糊高分辨成像方法

刘丰恺; 冯存前; 黄大荣; 郭新荣; 韩立珣

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

doi: 10.13700/j.bh.1001-5965.2019.0648

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

基金项目:

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

详细信息

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

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

通讯作者:
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黄大荣, E-mail: rsphdr@163.com

中图分类号: V221⁺.3;TB553
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- 文章访问数: 634
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- 被引次数: 0
出版历程
- 收稿日期: 2019-12-29
- 录用日期: 2020-04-17
- 网络出版日期: 2021-01-20

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

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

Funds:

National Natural Science Foundation of China 61701528

Natural Science Foundation of Shaanxi Province, China 2019JQ-497

China Postdoctoral Science Foundation 2019M661508

Foundation of Air Force Engineering University President XZJK2019030

摘要

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。
- 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.
- ISAR imaging /
- Doppler ambiguity removal /
- Migration Through Range Cells (MTRC) compensation /
- high-speed maneuvering target /
- CLEAN technology

HTML全文

图 1 ISAR转台成像示意图

Figure 1. Schematic diagram of ISAR turntable imaging

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图 2 多普勒模糊

Figure 2. Doppler ambiguity

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图 3 不同多普勒模糊数下的判定区域

Figure 3. Judgment region under different Doppler ambiguity numbers

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图 4 距离徙动补偿

Figure 4. Compensation of migration through range cells

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图 5 仿真飞机

Figure 5. Simulated aircraft

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图 6 不同算法下一维距离像对比

Figure 6. Comparison of one-dimensional range profile among different methods

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图 7 不同算法结果对比

Figure 7. Comparison of results of different methods

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图 8 不同信噪比下的对比度

Figure 8. Contrast ratio under different SNRs

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