基于分数阶傅里叶变换的双雷齐射主动自导方法  

Two-Torpedo Salvo Active Homing Method Based on Fractional Fourier Transform

作　　者：蒋帅 樊书宏[1] 郝保安[1] JIANG Shuai;FAN Shu-hong;HAO Bao-an(The 705 Research Institute,China Shipbuilding Industry Corporation,Xi’an 710077,China)

机构地区：[1]中国船舶重工集团公司第705研究所,陕西西安710077

出　　处：《水下无人系统学报》2020年第6期677-684,共8页Journal of Unmanned Undersea Systems

摘　　要：针对双雷齐射中可能产生的两雷相互干扰问题,文中提出了一种基于分数阶傅里叶变换的双雷齐射主动自导方法。两雷通过分别发射不同调频斜率的线性调频(LFM)信号,并利用分数阶傅里叶变换对LFM信号的聚焦特性,以实现双雷回波信号的分离检测。在此基础上,提出了双雷齐射目标检测的总体方案,并进一步分析了影响目标参数估计结果的主要因素。不同信噪比条件下的仿真试验结果表明,利用分数阶傅里叶变换可有效实现双雷齐射目标检测,具有较强的抗干扰能力,且双雷基本可工作于同一频段,无需分频段使用。该方法可对双雷齐射条件下的主动自导提供参考。A two-torpedo salvo can effectively improve hit probability,but it may cause mutual interference problems.Therefore,a two-torpedo salvo active homing method based on fractional Fourier transform is proposed in this study.The echo signals of two torpedoes can be separated and detected by transmitting linear frequency modulation(LFM)signals at different chirp rates and by applying the focus characteristics of the fractional Fourier transform to those LFM signals.Accordingly,a general scheme for two-torpedo salvo target detection is proposed,and the main factors that affect the target parameter estimation results are further analyzed.Simulation results under different signal-to-noise ratios show that using fractional Fourier transform can effectively realize target detection of a two-torpedo salvo and has strong anti-interference capabilities.In addition,two torpedoes can work in the same frequency band without frequency division,thus making the method feasible for use in two-torpedo salvo active homing.

关 键 词：鱼雷 双雷齐射 分数阶傅里叶变换 主动自导 目标检测 

分 类 号：TJ630[兵器科学与技术—武器系统与运用工程] TB566[交通运输工程—水声工程]