【摘要】 导弹敌我识别系统的核心技术之一是询问信号与应答信号的加密传输.针对其要求密码容量大、随机性强的特点,引入了M序列,分析了其特点.利用剪接筛法和单片机设计了一个可产生并存储全部5级M序列的密码器.给出了电路原理图,分析了其工作过程.给出了各层相交线对的产生流程图,分析了5级M序列单元电路的工作过程.完成了密码器软件和硬件的调试.密码器的容量为2 048,密码长度为32.给出了密码器的序列波形及相应存储器中存储的内容,并对它们的特征进行了分析.实验结果表明所设计密码器是正确有效的.更多还原

【Abstract】 One of the key technologies in the missile IFF(identification friend or foe) system is the encrypting transmission for the questioning and answering signals.To meet the ciphers requirements with larger capacity and stronger randomicity in the system,the M-sequence was introduced and its characteristics were analyzed.With the cut-join sieve method and the microcontroller,a coder was proposed.The principle diagrams and working process were analyzed.The generating flow chart on the intersecting line pairs of each layer was given and the five-level M-sequence circuit unit working process was analyzed.The software and the hardware were debugged.The coder could generate and store all five-level M-sequences.The ciphers capacity is(2 048).The ciphers length is 32.The sequence waveforms of the coder and the stored contents in E~2PROM((electrically-)erasable programmable read-only memory) were given and their characteristics were analyzed.The experimental results show that the method is valid and the designed coder can work well.更多还原