针对敌我识别系统的个体识别研究

Research on Specific Emitter Identification for IFF System

对敌我识别系统的研究大部分集中在对其信号的检测和解调上,对辐射源个体识别技术也是近年来的研究热点,但很少有专门针对敌我识别系统的个体识别研究。本文通过分析敌我识别信号,发现其区别于普通雷达信号的主要两个特点:一是信号载频固定不变;二是信号以码字为单位出现,且脉冲时序格式固定。针对敌我识别信号的这两个特点,本文设计的个体识别方法重点包括:一、瞬时频率可作为有效的个体特征;二、可综合同一串码字里多个脉冲的个体识别结果,提高目标个体识别正确率。试验结果显示,相较于只用单脉冲的方法,本文算法的个体识别正确率更高。

Most researches about IFF system focus on signal detection and decode.Although there are many spe⁃cific emitter identification(SEI)researches,rarely are done specially for identification friend or foe(IFF)system.We find that IFF system has two features which differ from normal radars.One is that its carrier frequency is fixed,and the other is that IFF signals are formed by a set of pulses and the sequence of the pulses is fixed.This paper proposes a new SEI method for IFF system.We suggest that instantaneous frequency can be a valid individual feature for SEI.The iden⁃tification results of all the pulses in the same sequence can be integrated into one,which is the final SEI result for an IFF emitter.The experimental results show that our new SEI method has higher identification accuracy than the tradi⁃tional ones that use single pulse only.