多通道实时伪码发生器的设计与实现

The Design and Implementation of Real-Time Pseudo-Codes Generator in Multi-Channel

伪码生成器是直接序列扩频系统中的重要一环。因此,设计了一种基于FPGA实现的实时生成码发生装置,利用双端口RAM码NCO结构来实现接收机全局时钟下码频率的转换和初相的设置,通过RAM输入数据位宽实现多通道码输入。每个码周期结束对码初相重新置位,减少了恶劣太空环境下发生单粒子翻转导致数据出错的影响,可以广泛应用于直扩系统接收机。

Pseudo-codes generator plays an important role in the Direct Sequence Spread Spectrum(DSSS)communication system.In this paper,a real-time code generation device is designed based on FPGA,which uses the dual port RAM and NCO structure to realize the code frequency conversion under the global clock of the receiver.The design realizes multi-channel input through setting data width of the dual port RAM and decreases single event upsets in harsh space environment by resetting the initial phase at the end of each code cycle.This codes generator can be widely used in the DSSS signal receivers.