最优字典选择多频段雷达信号宽带融合  

Broadband Fusion of Multiband Radar Signals Based on Optimal Dictionary Selection

作　　者：陆睿民 李卫东[1,2,3] 王锐 张帆[1,3] 李沐阳 胡程[1,2,3] LU Ruimin;LI Weidong;WANG Rui;ZHANG Fan;LI Muyang;HU Cheng(Radar Technology Research Institute,Beijing Institute of Technology,Beijing 100081,China;Advanced Technology Research Institute,Beijing Institute of Technology,Jinan 250300,China;Key Laboratory of Real-Time Information Processing Technology of Embedded,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学雷达技术研究院,北京100081 [2]北京理工大学前沿技术研究院,济南250300 [3]北京理工大学嵌入式实时信息处理技术北京市重点实验室,北京100081

出　　处：《电子与信息学报》2024年第5期2076-2086,共11页Journal of Electronics & Information Technology

基　　金：山东省自然科学基金(ZR2022QF073);国家自然科学基金(62201049);国家重大科研仪器研制项目(31727901)。

摘　　要：多频段雷达带宽融合外推是一种提升雷达带宽、解决小目标高分辨成像的有效手段。然而,现有多频段融合算法仍面临运算慢、精度低等问题。为此,该文提出基于最优字典选择正交匹配追踪的多频段融合外推雷达超分辨距离成像方法。首先,对多频段信号进行参数化建模,提出基于蛇优化的信号相参配准方法,实现多频段信号高精度相位对齐;然后,利用几何绕射模型,提出基于最优字典选择正交匹配追踪的多频段信号模型估计方法,实现多频段信号融合外推,估计未知频段频谱,获取大带宽信号;最后,通过仿真和实测数据,验证了该方法的可行性。该方法在保障高精度的前提下,通过简化模型粗估计与完整模型精估计结合,有效降低了运算量,实现了快速精确多频段融合外推处理。Multiband Fusion is an effective way to broaden bandwidth of radar,which plays a key role in the detection and recognition of small-scale target.However,the existing multiband fusion algorithms still face the problems of slow operation and low precision.Therefore,a super-resolution technique of multiband fusion based on optimal dictionary selection and orthogonal matching pursuit is proposed in this paper.Firstly,the parametric model of multiband radar signal is conducted.Next,Snake Optimizer(SO)is applied to the coherent processing.Then,an Orthogonal Matching Pursuit(OMP)algorithm based on the optimal Geometrical Theory of Diffraction(GTD)dictionary selection is used to extrapolate the vacant spectrum.Experiment results of simulated and measured data are given.Experimental results show that the proposed method can effectively achieve super-resolution.This method combines simplified model rough estimation with complete model fine estimation,effectively reducing the amount of computation and realizing fast and accurate multiband fusion extrapolation processing.

关 键 词：多频段融合外推 相参配准 最优字典选择 蛇优化算法 正交匹配追踪 

分 类 号：TN953[电子电信—信号与信息处理]