低频时码接收机高精度定时的研究

A Study of Low Frequency Time-code Receiver High Precision Timing

低频时码接收机的高精度定时问题,是研制高精度用户终端设备的关键。本文通过合理的UTC控制来选择所需要的数据段,利用三次样条插值计算载波信号的峰值点,并用最小二乘拟合得到光滑的下降曲线。该曲线的斜率最大点即为低频时码接收机的秒定时参考点。实验结果表明,采用该方法后接收机的定时精度可以达到数十微秒。

The question of low frequency time-code receiver high precision timing is a key in the development of high precision timing terminal. In this paper, the reasonable data was acquired by UTC controlling, and a method based on cubic polynomial spline interpolation was proposed to compute a peak-value of the signal, and finally a smooth curve was gained by least square curve fitting. In this curve, the point which had the largest inclined rate was a timing reference point of low frequency time-code receiver. The experimental results show that the method can improve the timing precision of receiver up to38 microseconds.