基于姿态变化的航空频率域电磁法仪器偏置实时校正方法研究

发布时间：2018-06-04 13:01

本文选题：航空频率域电磁法 + 实时　；参考：《地球物理学报》2016年10期

【摘要】：磁偶极子的航空频率域电磁法仪器在飞行测量的过程中由于仪器偏置的存在,且仪器偏置会随着外部气压、温度等环境因素以及收发线圈晃动的影响而呈现非线性变化,使得观测数据出现误差,因此需要对仪器偏置进行校正.而传统的在测线飞行前后将仪器抬至高空的"零场值"标定方法具有成本高、受测区环境影响大以及采用线性插值获取测线飞行过程中仪器偏置的精度低等缺点.本文根据仪器偏置与仪器姿态角变化无关的特性,通过测得仪器的姿态角信息,在满足重叠偶极子模型的条件下,实现对仪器偏置的高精度实时校正.模型仿真结果表明,在30m常规飞行高度下,该方法实时测得的仪器偏置精度接近于110m高空测得的精度;校正后仪器偏置的绝对误差与理论二次场的比值即相对误差小于5%,满足反演大地电导率的精度要求.该方法不仅减少了飞行的工作量,降低了飞行成本和飞行难度,而且可更加精确地获得测线飞行过程中仪器偏置的非线性变化值,提高航测数据的观测精度.
[Abstract]:The airborne frequency domain electromagnetic instrument of the magnetic dipole has a nonlinear variation due to the existence of the instrument bias during the flight measurement process, and the instrument bias changes with the influence of the external pressure, temperature and other environmental factors, as well as the sloshing of the transceiver coil. The error of the observed data makes it necessary to correct the bias of the instrument. However, the traditional calibration method of "zero field value" which carries the instrument to the high altitude before and after the flight of the measuring line has the disadvantages of high cost, great influence by the environment of the measuring area and low precision of the instrument bias in the course of the flight by linear interpolation. According to the characteristics that the instrument bias is independent of the change of the instrument attitude angle and the information of the instrument attitude angle is obtained, the high precision real-time correction of the instrument bias is realized under the condition that the overlapping dipole model is satisfied. The model simulation results show that the accuracy of the instrument bias measured in real time by this method is close to that measured at a height of 110 m at a conventional flight altitude of 30 m. The ratio of absolute error of bias to theoretical quadratic field after correction is less than 5, which meets the precision requirement of inversion of earth conductivity. This method not only reduces the flight workload, flight cost and flight difficulty, but also more accurately obtains the nonlinear variation value of the instrument bias during the flight, and improves the observation accuracy of the aerial survey data.
【作者单位】：中国科学院电子学研究所;中国科学院电磁辐射与探测技术重点实验室;中国科学院大学;
【基金】：国家重大科研装备研制项目“深部资源探测核心装备研发”子项目“航空瞬变电磁勘探仪”(ZDYZ2012-1-03-05)资助
【分类号】：P631.33

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