摘要
针对敌我识别信号Mode5格式中脉内调制码的解调问题,利用过零检测法提出了在窄脉冲中提取最小频移键控(MSK)信号的非相干数字解调方法,在现场可编程门阵列(FPGA)中实现了信号实时解调,同时对误码率进行了理论推导。试验结果表明,该方法适用于敌我识别信号中Mode5的解调,并具有简单、实用和对载波频偏不敏感等优点。
Aimed at the problem of demodulating the intra-pulse modulated codes of identification foe or friend（IFF）signals with the Mode 5format,a non-coherent digital demodulation method for picking up the minimum frequency-shift keying（MSK）signal in the narrow pulses is proposed with zero-passing detection method.The signal demodulating in real time is realized in the field-programmable gate array（FPGA）and the bit error rate（BER）is also theoretically derived.Experimental results show that the method can demodulate the Mode 5signals of IFF and has advantages of simplicity,utility and insensitivity for carrier frequency deviation.
出处
《指挥信息系统与技术》
2016年第2期88-92,共5页
Command Information System and Technology
关键词
最小频移键控
非相干解调
敌我识别信号
Mode5格式
minimum frequency-shift keying（MSK）
non-coherent demodulation
identification foe or friend（IFF）signal
Mode 5format
