The basic principle of synchronization of the FD / SSMA system is studied in this paper where recognizing and tracking of timing synchronization between the local reference signal and the received signal tracking and locking of the frequency and phase of carrier are included .

本文分析研究该系统的同步原理，其中包括接收机 参考 信号与所接收信号的定时同步的识别、 定时同步的跟踪、载波频率跟踪及载波相位跟踪。

To improve the timing precision of the receiver it is necessary to research the timing reference point of the second signal .

为了提高接收机的定时精度，对 反映 低频 信号秒 到来 时刻 的 确定方法作了较为深入的研究。

A counter with timing fiducial oscillator acts as a frequency multiplier and the count value in the prior period is taken as the reference for the current period to give the decimal part of a signal period .

该方法利用带基准 时基的数字计数器实现周期内线性细分，当前周期信号将前一整周期的倍频数作为 参考构成 信号周期的小数部分。

The calibration and optimization of spark timing are very important in alternative fuel engines on R & D. An ECU detects TDC reference signal of Hall sensor and the software delay is used for adjusting spark timing .

ECU通过检测霍尔传感器的上止点 参考 信号，利用软件延时方式实现 点火提前角的调整，并以排放、动力性为优化目标进行标定。