伪随机序列在通信中获得广泛应用,如在误码仪中普遍采用m序列作为测试信号,其同步捕捉方法已成为专门的研究课题。本文分析了几种不同的捕捉方案,指出了现有误码仪的不足,即同步丢失门限人为设定(如10~(-2)),当突发误码产生时会导致测试中断,不能显示真实误码率;设计了一种新型同步监测电路,可以检测出真正失步,并对突发误码进行记录。 Pseudo-random sequences are widely used in communication. For example, the m sequence is commonly used as the test signal in the bit error coder. The synchronization capture method has become a special research topic. This paper analyzes several different capture schemes and points out the shortcomings of the existing bit error detector, namely, the loss of synchronization threshold is set manually (such as 10 ~ (-2)), when the burst error will cause the test interrupt, can not Showing the true bit error rate; designed a new type of synchronous monitoring circuit that can detect the real out of step, and to record the burst error.