摘要
针对IFF Mode5敌我识别信号采用了猝发窄脉冲MSK调制体制,无法采用经典的相干解调方法,提出一种近似相干解调方法,采用基于小波变换的定时同步算法,同时利用MSK调制谱特征进行载波同步,对IFF Mode5敌我识别信号进行解调。分析了基于同步环路的经典相干解调算法局限性和推导MSK近似相干解调方法理论基础,论证该方法可达到的理论极限与可行性,同时对IFF Mode5敌我识别信号进行了解调仿真,结果表明MSK近似相干解调方法针对窄脉冲MSK调制信号具有实现简单、处理有效的优点,相较于非相干类MSK解调方法性能有较大的提升。
For the IFF Mode5 signal used burst narrow pulse and MSK modulation method,the classical coherent demodulation method can’t be used to demodulate.The IFF Mode5 signal approximate coherent demodulation method is proposed,which uses wavelet transform time synchronization and MSK spectrum characteristic carrier synchronization.The limitation of classical coherent demodulation method based on synchronization loop is analyzed.The theoretical basis of MSK approximate coherent demodulation method is deduced and demodulation of IFF Mode5 signal is demonstrated.The results show that the MSK approximate demodulation method has the advantages of simple implementation and effective processing for narrowpulse MSK modulated signals.And the performance is greatly improved which compared with the noncoherent MSK demodulation method.
作者
陈韵
刘建
彭茄恩
宋大伟
Chen Yun;Liu Jian;Peng Jiaen;Song Dawei(No.8511 Research Institute of CASIC,Nanjing 210007,Jiangsu,China)
出处
《航天电子对抗》
2021年第5期35-39,共5页
Aerospace Electronic Warfare
关键词
敌我识别
Mode5信号
最小频移键控(MSK)
小波变换
identification friend or foe(IFF)
Mode5 signal
minimum frequency shift keying(MSK)
wavelet transform
