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针对扩频通信系统中的PN码同步问题,在分析扩频码跟踪方法的基础上,讨论了同步失锁问题,给出非相干延迟锁定环的计算公式和降低同步失锁误判的方法,并对其进行Matlab仿真及FPGA硬件调试。结果表明:该同步系统能够很好地跟踪接收端PN码的相位变化,失锁电路能够有效工作,并准确判断出同步失锁状况。
Aiming at the problem of PN code synchronization in spread spectrum communication system, based on the analysis of spread spectrum code tracking method, the problem of synchronization loss is discussed. The formula of incoherent delay locked loop and the method of reducing the misjudgment of synchronization lost lock are given. And Matlab simulation and FPGA hardware debugging. The results show that the synchronization system can well track the phase change of the PN code at the receiving end, and the lost lock circuit can work effectively and judge the out-of-synchronization condition accurately.