基于FPGA的猝发式直扩载波同步技术研究与实现

摘要

针对短时猝发式直扩系统中大频偏情况下信号载波的捕获和跟踪问题,提出了一种集扫频、FFT频率估计和数字锁相环技术于一体的载波同步实现方案.基于Matlab进行方案仿真和基于FPGA平台进行硬件实现,并通过EDA软件SignalTap工具实时捕获数据完成方案可行性验证.结果表明,该方案可以满足系统设计要求.%A scheme is proposed to achieved carrier synchronization based on sweeping frequency, FFT frequency estimation and digital PLL, in order to solve the problem of carrier acquisition and tracking of spread spectrum signals under large frequency offset circumstance in short-term burst-mode DSSS system. The scheme is successfully simulated by MATLAB and validated with SignalTap tools based on FPGA hardware platform. The results show that the scheme can meet the system design which smoothly achieves carrier acquisition and tracking of spread spectrum signals.