基于GPS授时的脉冲峰值采集系统

该系统用于提取脉冲信号峰值的幅度与时刻。系统硬件部分包括GPS接收机、GPS时钟模块、脉冲峰值采集卡及工控机。其原理为脉冲峰值采集卡以GPS接收机的1 PPS脉冲上升沿为秒起点,以设定的时间窗宽分段查找输入的最大值并记录其对应的秒内精确时刻,完成脉冲峰值的采集与峰值时刻的记录,为保证脉冲峰值时间的准确度,系统的50 MHz采样时钟也由1 PPS脉冲校准。实验验证了该系统能准确地捕捉脉冲的峰值时刻。

Pulse Peak Acquisition System Based on GPS Timing

The system is used to extract the amplitude and accurate arriving time of a pulse peak.The hardware includes GPS receiver,pulse peak acquisition card,GPS clock module and industrial computer.The principle of this system is that through using the 1 PPS output of the GPS receiver,to synchronize the acquisition card's second starting point;by using the time window as a maximum-finding unit,to track the peak's amplitude and arriving time of the input.The 50 MHz sampling rate is also stabilized by 1 PPS to achieve a better timing accuracy.The experimental results demonstrate the system can capture the arriving time of a pulse peak accurately.