基于ADMM的SAR多运动目标成像方法  

ASAR Multiple Moving Targets Imaging Based on ADMM

作　　者：穆慧琳 王泽武 丁畅 王甲富[2] 孙杉 易统 李耀敏 MU Huilin;WANG Zewu;DING Chang;WANG Jiafu;SUN Shan;YI Tong;LI Yaomin(Air Defense and Antimissle School,Air Force Engineering University,Xi’an 710051,China;Fundamentals Department,Air Force Engineering University,Xi’an 710051,China;Unit 93160,Beijing 100800,China;Wuhan Maritime Communications Research Institute,Wuhan 430200,China)

机构地区：[1]空军工程大学防空反导学院,西安710051 [2]空军工程大学基础部,西安710051 [3]93160部队,北京100166 [4]武汉船舶通信研究所,武汉430200

出　　处：《空军工程大学学报》2024年第4期41-48,78,共9页Journal of Air Force Engineering University

基　　金：国家自然科学基金(62201612);中国博士后科学基金(2023M734272)。

摘　　要：为提高合成孔径雷达(SAR)多运动目标同时聚焦性能和成像效率,利用多运动目标信号的多分量线性调频信号形式和稀疏先验知识,提出基于交替方向乘子法(ADMM)的SAR多运动目标成像方法。通过建立SAR多运动目标稀疏观测模型,将多运动目标成像问题建模为稀疏特征约束下的逆问题求解。基于自适应Chirplet分解方法对目标多普勒调频率进行估计,从而实现观测矩阵设计。为获得较高的动态响应范围和较低的旁瓣响应,采用ADMM对多运动目标进行稀疏重构,ADMM将复杂的凸优化问题分解为多个交替寻找最优解的子优化问题,从而实现多运动目标图像精确且高效重构。最后通过仿真实验和机载SAR实测数据验证所提算法在聚焦成像质量和工作效率方面优于其他成像方法。In order to achieve simultaneously excellent multiple moving target imaging quality and imaging efficiency,a SAR multiple moving target imaging method based on alternating direction method of multipliers(ADMM)is proposed by utilizing the multi-component linear frequency modulation signal form and sparse prior knowledge of synthetic aperture radar(SAR)multiple moving target signals,First,a sparse observation model of SAR multiple moving targets is established to formulate the multiple moving target imaging task into an inverse problem with the sparse feature constraint.Then the adaptive Chirplet decomposition method is applied to realize the estimation of target Doppler modulation frequencies for the observation matrix construction.The well-focused SAR image of multiple moving targets can be sparsely reconstructed based on ADMM decomposing the complex convex optimization problem into several simple subproblems which can be alternately solved.Finally,the simulations and the experiments on airborne SAR data show that the proposed method is superior to the existing moving target imaging methods in terms of imaging quality and imaging efficiency.

关 键 词：合成孔径雷达 多运动目标成像 交替方向乘子法 稀疏重构 

分 类 号：TN958.3[电子电信—信号与信息处理]