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Costas环载波同步系统被广泛用于接收机中的数字信号处理部分,针对现有Costas环结构需预先将特定码速率对应的参数值固定到程序内部,参数值不能实时修改的缺陷。在分析和研究原有Costas环结构的基础上,设计并实现了一种参数可实时修改、适用可变码速率的Costas环载波同步系统。该系统由外部控制器根据码率的改变而动态计算各参数,借助FPGA重载技术实时更新到Costas载波同步环。通过理论推导、软件仿真分析,验证了设计的正确性,实现了可变码速率的载波同步,且该系统也适用于复杂多变环境下的载波同步。
The Costas ring carrier synchronization system is widely used in the digital signal processing part of a receiver. For the existing Costas ring structure, the parameter value corresponding to a specific code rate needs to be fixed in advance to a defect that the parameter value can not be modified in real time. Based on the analysis and study of the original Costas ring structure, a Costas loop carrier synchronization system with variable code rate and real-time modification of parameters is designed and implemented. The system by the external controller according to the rate of change of the dynamic calculation of the parameters, with real-time FPGA overloading technology to the Costas carrier synchronization loop. Through the theoretical derivation and software simulation analysis, the correctness of the design is verified and the carrier synchronization with variable code rate is realized. The system is also suitable for the carrier synchronization in the complex and changeable environment.