一种物探仪器系统特性高精度标定方法  

A high accuracy calibration method for geophysical prospecting instrument system characteristics

作　　者：罗维斌 李梅[2] 韩海涛 高曙德[3] 

机构地区：[1]甘肃省有色地质调查院,甘肃兰州730000 [2]中国地质大学(北京)信息工程学院,北京100083 [3]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《物探与化探》2016年第4期816-819,共4页Geophysical and Geochemical Exploration

基　　金：国家自然科学基金"相关辨识技术在谱激电中的应用研究"项目(41374185);国家自然科学基金项目(41174059);甘肃省地震局科技发展野外站基金项目(2014Y03)联合资助

摘　　要：笔者提出了基于相关辨识的物探仪器系统特性标定方法,采用逆重复M序列作为激发信号,向仪器测量通道输入编码电流,按一定的采样率,记录激发电流和仪器响应输出时间序列,采用循环互相关法获取仪器系统的频率响应。仿真计算结果表明采用编码源循环互相关法标定仪器系统特性,提高了系统频率特性的频率分辨率。多周期叠加能显著提高辨识精度,提高采样率也有助于提高辨识精度,但要与系统数据存贮能力相匹配。The high accuracy calibration method for the system characteristics of geophysical prospecting instruments based on correlation identification is proposed in this paper. The inverse repeated M sequence is used as the excitation signal,the measurement channel of the instrument is disturbed with encoded input current,the excitation current and instrument response output in time series is recorded according to the same sampling rate,and then circular cross-correlation method is used to obtain the instrument system frequency response. The simulation results show that the frequency resolution of the instrument system is improved by using the method based on encoding source,the multi-period excitation can significantly improve the accuracy of identification,and the right sampling rate is also helpful to improving the accuracy of identification,but it should match with the system data storage capacity.

关 键 词：仪器标定 逆重复M序列 循环互相关 频率响应 

分 类 号：P631[天文地球—地质矿产勘探]