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.