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在数字集群接收机性能测试中,误码率是必不可少的一个重要测试指标,而计算误码率时同步点的查找是其关键的一步.该文利用了m序列自相关系数良好的二值特性,将其作为输入信号码元,采用接收端数据与输入基准信号做滑动相关运算的方法来找到同步点.在pc机上用C语言和matlab软件编程实现了对系统的同步点的查找以及误码率的计算,实验证明这种方法简单、实用.“,”In the performance test of the trunked radio receiver,the bit error ratio (BER) test is a necessary and important guide line,and finding the synchronized point is the key step in the BER calculation. Because the auto correlation coefficient of the m sequence has good two values characteristic,this paper uses it as the input signal source,and finds the synchronized point using the method that doing the sliding correlation operation between the input signal and the received signal. In PC machine the synchronized point is found and the BER is calculated by C and matlab software programming. The experiment shows that the method is simple and practical.