FMCW-ISAR对舰船目标成像脉内补偿方法研究

王勇; 黄鑫

doi:10.12000/JR18079

FMCW-ISAR对舰船目标成像脉内补偿方法研究

DOI: 10.12000/JR18079

王勇^,,
黄鑫

哈尔滨工业大学电子与信息工程学院哈尔滨 150001

基金项目: 国家自然科学基金(61622107, 61871146)

详细信息

作者简介:
王　勇(1979–)，男，吉林扶余人，哈尔滨工业大学博士，教授，博士生导师。主要研究方向为雷达成像技术。E-mail: wangyong6012@hit.edu.cn

黄　鑫(1996–)，男，甘肃张掖人，哈尔滨工业大学硕士生，研究方向为ISAR成像脉内补偿、横向定标及太赫兹ISAR成像。E-mail: sxz722@sina.com

通讯作者:
王勇　wangyong6012@hit.edu.cn

中图分类号: TN957.51
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出版历程
- 收稿日期: 2018-09-21
- 修回日期: 2018-11-20
- 网络出版日期: 2019-06-01

Research on In-pulse Compensation Method for Imaging Ship Targets in FMCW-ISAR

WANG Yong^,,
HUANG Xin

School of Electronics and Information Engineering, Harbin Institution of Technology, Harbin 150001, China

Funds: The National Natural Science Foundation of China (61622107, 61871146)

More Information

Corresponding author: WANG Yong, wangyong6012@hit.edu.cn

摘要

摘要: 调频连续波逆合成孔径雷达(FMCW-ISAR)具有造价低、功耗低和重量轻的优点，因此被广泛用于对各类目标成像。FMCW信号可以看作是占空比为1的脉冲信号，其脉冲宽度相对较长，在此期间内目标的运动常常不可忽略。此时，利用传统的“走-停”模式和距离-多普勒(R-D)算法得到的ISAR像将出现距离-方位2维的模糊，导致图像分辨率下降。该文针对FMCW-ISAR对舰船目标实测数据成像时出现的模糊现象进行了研究，首先建立目标的运动模型，并分析目标在调频周期内的运动分量对距离压缩结果和最终成像结果的影响，最后提出相应的脉内补偿方法以改善图像分辨率。对比补偿前后对仿真模型与实测数据的成像结果，该文所提出的脉内补偿方法能够有效抑制1维距离像的展宽，提高FMCW-ISAR的成像质量。
- 调频连续波逆合成孔径雷达 /
- 舰船目标成像 /
- “走-停”模式 /
- 脉内补偿
Abstract: Given its advantages of low cost, low weight, and low power consumption, Frequency Modulated Continuous Wave-Inverse Synthetic Aperture Radar (FMCW-ISAR) has been widely used for imaging many kinds of targets. Since the FMCW signal can be regarded as a pulse signal whose duty ratio is one and pulse duration is relatively long, the motion of targets usually cannot be neglected. In this circumstance, the stop-go assumption is not valid, so ISAR images obtained using the traditional Range-Doppler (R-D) procedure exhibit two-dimensional blurring, which results in decreased resolution. In this paper, we investigate the blur problems of FMCW-ISAR in imaging ship targets, and construct a target motion model. Then, we analyze the influence of the in-pulse motion component in range profiles and final images. We propose a corresponding in-pulse compensation method to improve the resolution of ISAR images. A comparison with the imaging results of real measured echo data verifies the effectiveness of the proposed method in diminishing the 1-D-profile broadening and improving image quality.
- Frequency Modulated Continuous Wave-Inverse Synthetic Aperture Radar (FMCW-ISAR) /
- Imaging ship targets /
- Stop-go assumption /
- In-pulse compensation

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图 1 FMCW-ISAR的Dechirp处理原理示意图

Figure 1. The schematic diagram of Dechirp process for the FMCW-ISAR

下载: 全尺寸图片幻灯片

图 2 R-D成像算法流程图

Figure 2. Flow chart of R-D imaging algorithm

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图 3 船只的散射点模型

Figure 3. The scatter model of ship target

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图 4 散射点模型仿真成像结果

Figure 4. ISAR images of scatter model

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图 5 货船目标光学照片

Figure 5. Optical photo of boat target

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图 6 补偿前后距离像对比

Figure 6. Comparison of range profiles before and after compensation

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图 7 ISAR成像结果1

Figure 7. The results of the 1st ISAR imaging

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图 8 ISAR成像结果2

Figure 8. The results of the 2nd ISAR imaging

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表 1 仿真雷达参数

Table 1. Parameters of radar in simulation

参数数值

载频 X波段
调频周期(ms) 2
带宽(MHz) 400
积累时长(s) 2.56
目标速度(m/s) 50
目标加速度(m/s²) 10

下载: 导出CSV

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