【摘要】 时钟同步是接收机的关键问题,传统模拟解调灵活性差,调试复杂。针对测控中常用的PCM/FM体制,介绍了一种全数字接收机的定时同步方法,采用数字转换跟踪环估计定时误差,通过内插计算和反馈控制采样时钟完成误差校正。同步计算全部由软件实现,设计灵活。Matlab仿真及VHDL代码的硬件实测结果表明,该方法同步时间快、定时精度高,适合FPGA实现。更多还原

【Abstract】 Timing synchronization is critical for a receiver.The analog demodulation method is very inflexible and it is hard to debug.For PCM/FM modulation commonly used in TT&C system,a timing synchronization method has been introduced in this paper.DTTL is used to estimate timing error,interpolation and sampling clock control are used to achieve error correction.All calculations are completed by software,so the method is flexible.The results of simulation with Matlab and hardware test with VHDL code indicate that this method is fast in synchronization,precise in timing and suitable for implementation in FPGA.更多还原