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公开(公告)号:US4188580A
公开(公告)日:1980-02-12
申请号:US843800
申请日:1977-10-20
CPC分类号: H04K1/02
摘要: A secure communication system for transmitting and receiving an encoded information signal. The system generates at transmitting and receiving locations a predetermined unique pseudorandom code. A synchronized tracking signal is imposed on the information to be transmitted and added to the information to form an intermediate signal. The pseudorandom code is then multiplied by the intermediate signal directly so that the ultimate result appears to assume the character of pseudorandom noise, which is then transmitted to the receiving location. The synchronization and transmitted encoded portion is decoded at the receiver and used to generate a base signal for a pseudorandom generator at the receiving location, as well as initiate initial clocking pulse time for operation of the receiver pseudorandom generator. The receiver then generates the predetermined pseudorandom code and divides the same against the encoded signal being received to form an intermediate signal having no pseudorandom signal component, which is then filtered to remove the tracking and masking signal and thereby generating the original information signal desired.
摘要翻译: 一种用于发送和接收编码信息信号的安全通信系统。 该系统在发送和接收位置处产生预定的唯一伪随机码。 对要发送的信息施加同步跟踪信号并将其添加到信息中以形成中间信号。 然后将伪随机码直接乘以中间信号,使得最终结果看起来呈现伪随机噪声的特性,然后将其传输到接收位置。 同步和发送的编码部分在接收机处解码,并用于在接收位置生成用于伪随机发生器的基本信号,以及启动用于接收机伪随机发生器的操作的初始时钟脉冲时间。 然后,接收机产生预定的伪随机码并将其与被接收的编码信号相分离,以形成不具有伪随机信号分量的中间信号,然后滤波以消除跟踪和屏蔽信号,从而产生所需的原始信息信号。