陈文峰,
夏赛强,
杨 军,
马晓岩
空军预警学院 ??武汉 ??430019
基金项目:国家自然科学基金(61671469)
详细信息
作者简介:吕明久:男,1985年生,博士生,研究方向为压缩感知在雷达成像中的应用研究
陈文峰:男,1989年生,博士生,研究方向为双基地ISAR成像及压缩感知方面的研究
夏赛强:男,1994年生,硕士生,研究方向为杂波干扰方面的研究
杨 军:男,1973年生,副教授,主要研究方向为雷达系统、雷达信号处理与检测理论
马晓岩:男,1962年生,教授,主要研究方向为雷达系统、雷达信号处理与检测理论、现代信号处理及其应用
通讯作者:吕明久 lv_mingjiu@163.com
中图分类号:TN957.52计量
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被引次数:0
出版历程
收稿日期:2018-01-16
修回日期:2018-07-17
网络出版日期:2018-08-01
刊出日期:2018-11-01
Random Chirp Frequency-stepped Signal ISAR Imaging Algorithm Based on Joint Block-sparse Model
Mingjiu Lü,,Wenfeng CHEN,
Saiqiang XIA,
Jun YANG,
Xiaoyan MA
Air Force Early Warning Academy, Wuhan 430019, China
Funds:The National Natural Science Foundation of China (61671469)
摘要
摘要:在回波数据稀疏、低信噪比等不利条件下,利用随机调频步进信号进行ISAR成像时,成像性能将会严重下降。针对上述问题,该文在充分分析随机调频步进信号回波特性的基础上,提出利用目标距离向具有的联合块稀疏特征来获得高质量ISAR图像的新方法。首先,推导了在随机调频步进信号发射波形条件下目标回波信号的联合块稀疏成像模型并分析了该模型特征;其次,提出了联合块稀疏正交匹配追踪稀疏重构算法(JBOMP)实现对模型的求解。该算法利用ISAR回波信号具有的块稀疏以及联合稀疏等先验信息,因此在低量测值、低信噪比条件下的ISAR成像性能得到了增强。所提算法还可以实现对多维信号的联合处理,且具有较快的运算速度。理论分析与仿真实验均验证了所提方法的有效性。
关键词:ISAR成像/
随机调频步进信号/
联合稀疏模型/
块稀疏模型
Abstract:Under the condition of lack of echo data and low SNR, the ISAR imaging performance is greatly reduced by using Random Chirp Frequency-Stepped (RCFS) signal. To solve the above problems, based on fully analyzing the echo characteristics of the random chirp frequency-stepped signal, a new method of obtaining high quality ISAR images is proposed using the joint sparse feature of the target range dimension. First, a joint block sparse imaging model of the target echo signal under the condition of random chirp frequency-stepped signal is derived and the characteristics of the model are analyzed. Secondly, a Joint Block sparse Orthogonal Matching Pursuit (JBOMP) algorithm is proposed for solving the model. The algorithm utilizes the sparse information and the joint sparse information of the ISAR echo. Therefore, the ISAR imaging performance is enhanced under the condition of low measurement and low SNR. The proposed algorithm also can achieve joint processing of multidimensional signals and has a faster operation speed. Both theoretical analysis and simulation experiments verify the effectiveness of the proposed method.
Key words:ISAR imaging/
Random Chirp Frequency-Stepped (RCFS) signal/
Joint sparse model/
Block sparse model
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