针对在突发直接序列扩频(DSSS)信号跟踪中,信号持续时间短,而传统延迟锁定环(DLL)存在入锁时间长的问题,提出一种可变增益码跟踪环路设计方法。介绍了DLL环路基本原理和环路结构,对环路优化进行了理论分析,最后采用可变增益设计方法,自适应的调整环路增益,达到锁定时间和跟踪精度的平衡。通过仿真分析,在相同跟踪精度上,与传统DLL环路相比,锁定时间大大缩短。 Aiming at the problem that the signal duration is short and the lock-in time is long in DSSS signal tracking, a variable gain code tracking loop design method is proposed. The basic principle of DLL loop and loop structure are introduced, and the theory of loop optimization is analyzed. Finally, variable gain method is adopted to adjust the loop gain adaptively to achieve the balance of lock time and tracking accuracy. Through simulation analysis, in the same tracking accuracy, compared with the traditional DLL loop, locking time is greatly reduced.