CSAMT探测系统的低功耗高精度同步时钟源设计  

Design of low power consumption and high precision synchronization clock reference source for CSAMT detection systems

作　　者：林君[1] 吴勇[1] 薛开昶[1] 周逢道[1] 

机构地区：[1]吉林大学仪器科学与电气工程学院,地球信息探测仪器教育部重点实验室,吉林长春130026

出　　处：《中南大学学报（自然科学版）》2014年第9期3193-3199,共7页Journal of Central South University:Science and Technology

基　　金：吉林省科技发展计划重点项目(20100349);国家潜在油气资源(油页岩勘探开发利用)产学研用合作创新研究项目(OSR-2;OSP-2)

摘　　要：为了提高可控源音频大地电磁法(CSAMT)探测系统同步测量精度和降低系统功耗,在借鉴电力系统频率偏移校准设计思想的基础上,提出低功耗、数字化实时校准时钟基准源频率偏移技术。对全球定位系统(GPS)秒脉冲特性与晶体振荡器特性进行分析,设计以GPS秒脉冲为基准对晶体振荡器频率偏移进行脉冲补偿的方法;对脉冲补偿过程中的误差均分算法进行研究,实现基于温补晶振(TCXO)的低功耗高精度时钟源设计。研究结果表明:同步测量精度低于318 ns,时钟源功耗低于100 mW,有效地保证了时钟基准源输出频率的精度,降低了仪器野外工作功耗,提高了仪器野外工作效率。To improve the synchronization measurement accuracy and reduce the system power consumption of the controlled source audio-frequency magnetotellurics（CSAMT） detection system, using the design idea of calibrating frequency offset of electric power system for reference, a low power and digital technique for calibrating frequency offset of the clock reference source in real-time was proposed. Through the analysis of the characteristics of global positioning system（GPS） pulse per second signal and crystal oscillator, a pulse compensation method for crystal oscillator frequency offset was designed, which regarded GPS pulse per second as reference. By studying the error distribution algorithm in the process of pulse compensation, the low power and high precision clock reference source was realized, which was based on temperature compensated crystal oscillato（TCXO）.The experimental results show that the synchronization measurement accuracy is lower than 318 ns and power consumption of the clock reference source is lower than 100 mW, which can ensure the output frequency accuracy of the clock reference source effectively, reduce system power consumption and improve the efficiency of the instrument in field work.

关 键 词：电磁勘探 可控源音频大地电磁法 时钟基准源 脉冲补偿 

分 类 号：P631.33[天文地球—地质矿产勘探]