基于FPGA的捕获跟踪环路的研究和实现

o solve the problem that acquisition and tracking loop has complex structure,low utilization rate of resources and long frequency response time in the traditional DSSS system,a optimized design method which realizes the acquisition and tracking loop is proposed.This method used autocorrelation characteristic and phase characteristic of spread code,adopted the serial sliding correlation method as core algorithm of capture and introduced the phase circuit which divided by code clock to form a complete acquisition and tracking loop.This paper introduced the FPGA implementation scheme and simulation results of acquisition and tracking loop.The results of example test indicate that the acquisition and tracking loop can realize the precise synchronization of the spread code in DSSS System and put forward new ideas for the design of receiver in spread spectrum communication system.