基于蝙蝠谱相关及变换模型的雷达目标超分辨方法研究  

Research on Super-resolution Methods for Radar Targets Based on Bat-inspired Spectrogram Correlation and Transformation Models

作　　者：王博弘 申彪 穆文星 刘涛[1] WANG Bohong;SHEN Biao;MU Wenxing;LIU Tao(School of Electronic Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学电子工程学院,武汉430033

出　　处：《雷达学报(中英文)》2025年第2期293-308,共16页Journal of Radars

基　　金：国家自然科学基金(62171452)。

摘　　要：传统雷达分辨能力主要利用模糊函数来进行分析,其极限分辨力一般用瑞利限表征。自然界中蝙蝠具有相当敏锐的听觉系统,学者提出谱相关及变换(SCAT)模型对蝙蝠听觉系统建模,探索了蝙蝠的超分辨原理,为突破雷达目标常规(瑞利)分辨力提供了一个可能的途径。为了进一步提高SCAT模型的分辨性能,通过抑制距离像负半轴和原点处多余的波瓣,改进了基向量解卷积法和基带SCAT(BSCT)两种蝙蝠超分辨模型,同时提出可靠分辨力概念及计算方法,统一了SCAT分辨力与瑞利分辨力的衡量标准,对比验证了可靠分辨力概念的合理性以及改进算法的有效性。仿真与实测实验表明,改进超分辨算法均获得了可观的分辨力提升,其中改进基向量解卷积法性能最佳,将原基向量解卷积法的分辨力提高约2 dB,同时将匹配滤波分辨力提高约5 dB。The resolving power of traditional radar is mainly analyzed using the ambiguity function,and its limit is generally characterized by the Rayleigh limit.Bats have a rather sensitive auditory system.Researchers have proposed the Spectrogram Correlation And Transformation(SCAT)model to represent the auditory system of bats,explored their super-resolution principle,and provided a possible means to break through the conventional(Rayleigh)resolving power limit of radar targets.To further enhance the discriminative performance of the SCAT model,two bat-auditory-system-based super-resolution models,namely the base vector deconvolution method and Baseband SCAT(BSCT),are improved by suppressing redundant wave flaps at the negative semiaxis of the range profile and at the origin.Meanwhile,the concept and computation method of reliable discriminative power are proposed to unify the measurements of SCAT and Rayleigh discriminative powers.Further,a comparison is made to validate the rationality of the concept of reliable discriminative power,and the effectiveness of the improved models is verified.Simulation and real experiments show that the improved super-resolution models achieve a sizable increase in the resolving power.Notably,the improved base vector deconvolution method performs the best,improving the resolving power of the original method by~2 dB while enhancing the matched filtering resolving power by~5 dB.

关 键 词：瑞利分辨力 模糊函数 雷达超分辨 谱相关及变换 可靠分辨力 

分 类 号：TN957[电子电信—信号与信息处理]