针对爆炸近场噪声干扰严重导致时间差提取精度低、震源定位精度不高的问题,设计了基于FPGA与北斗的高精度时差信息获取系统。首先以FPGA为主控芯片设计北斗1PPS信号接收模块;其次通过接收各传感器节点上的高精度1PPS信号完成自身晶振校准与各传感器触发时间信息获取,从而获得高精度的时差信息;最后仿真验证结果表明,该系统满足实时性要求,能精确提取时差信息,可在与震源定位相关的嵌入式系统中使用。

Aiming at the problems of serious near-field noise interference of explosions,resulting in low time difference extraction accuracy and low source location accuracy,a system design of high-precision time difference information acquisition based on FPGA and Beidou is proposed.Firstly,the Beidou 1PPS signal receiving module is designed with FPGA as the main control chip.Secondly,by receiving high-precision 1PPS signals on each sensor node,crystal frequency calibration complete the acquisition of trigger time information of each sensor are completed,so as to obtain high-precision time difference information.Finally,the simulation results show that the system meets the real-time requirements and can accurately extract the time difference information,which can be used in embedded systems related to source location.