多功能电磁法仪器同步系统的设计与实现

Design and realization of synchronization system of multifunctional electromagnetic instrument

针对多功能电磁法仪器对同步信号的要求,以仪器上位机为主控单元,通过LabVIEW编程设计人机交互界面,依据获取的GPS模块信息,利用循环队列思想,自动计算分频参数并对FPGA进行设置。采用硬件描述语言VHDL对FPGA进行模块化设计,实现对GPS模块1PPS和10kHz的最小二乘估计预处理,并以处理后的1PPS作为对钟信号,控制FPGA分频模块,使其根据分频参数对处理后的10kHz分频产生同步信号。经实验验证,系统可通过人工或自动调整产生1Hz^5kHz同步信号,同步精度优于0.03μs,满足各电磁法同步精度要求。

To meet the requirement of synchronization signals of multifunction electromagnetic instruments,a synchronization system is developed.The PC of the instrument is taken as the master device to design the interactive interface using LabVIEW programming.The parameters are set for the FPGA frequency division based on the acquired information of GPS Module and the idea of circularqueue.The hardware description language VHDL is used to design the FPGA modules to achieve the least square estimation of 1PPS and 10 kHz.The treated 1PPS is taken as the clock signal to control the FPGA frequency division module,and the module is applied to divide the treated 10 kHz for the generation of synchronization signal according to the parameters.Experiment results show that the developed system can manually or automatically generate 1 Hz to 5 Hz sync signals,with sync accuracy better than 0.03 sthat meets the accuracy requirement of most electromagnetic methods.