直扩系统PN码捕获和跟踪的FPGA实现

摘要

Based on the theory of digital matched filter and advance-lag loop, a circuit of capture and tracking of PN-code with FPGA is realized using VHDL programming. The design of all module of the circuit is discussed in detail, the circuit simulation and validation is completed, and the simulative waveform is showed. Result shows that the circuit works normal and reliable, and the system extension is convenient and flexible, which can meet the design requirements well.%在数字匹配滤波器和超前滞后鉴相环路的理论基础上,采用VHDL编程,在FPGA芯片上实现PN码捕获和跟踪的电路.详细讨论了各电路模块的设计实现方法.完成电路的仿真验证,给出了仿真波形.结果表明电路工作正常可靠,系统扩展方便灵活,满足设计要求.