基于SQUID三轴磁强计求取高精度磁总场研究
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摘要
根据航空超导全张量磁梯度系统中高精度磁总场需求,文中针对基于高灵敏低温超导量子干涉器件(LTS-SQUID)构建的三轴磁强计建立了校正模型,以校正其存在的零偏误差、比例因子误差与非正交误差。同时就SQUID重置后零偏偏大导致的算法寻优困难问题,提出零偏预校正方案,并在预校正基础上用自适应遗传算法对校正参数进行求解。此外,通过校正模型的正演研究了解了总场误差的分布情况,于反演仿真中,可将正演数据的总场误差校正至0.02 nT附近,其中预校正方案实现了零偏初步定位。在安静均匀地球磁场下进行了SQUID三轴求总场实验,将光泵磁力仪采集的数据视为理想总场。实验结果表明,经校正后的三轴实验数据合成的总场与光泵输出的标准差能达到0.2 nT量级以下。
Based on the demand of high-accuracy total field for airborne full-tensor gradiometer superconducting system,error-correction model was built depending on a kind of high-sensitivity LTS-SQUID 3-axial magnetometers to calibrate the zero deviation error,proportional factor error and non-orthogonal error.To solve the difficulty of algorithm optimization introduced by high SQUID reset zero-offset,zero-offset pre-correction scheme was proposed.Based on the pre-correction,adaptive genetic algorithm was used to solve the correction parameters.In addition,the forward modeling of the correction model was used to understand the distribution of the total field error.In the inversion simulation,the total field error of the forward modeling data can be corrected to the vicinity of 0.02 nT,in which the pre-correction scheme achieved the initial positioning of zero deviation.SQUID triaxial total field experiment was carried out under the quiescent and uniform earth magnetic field,and the data collected by optical pump magnetometer was regarded as the ideal total field.The experimental results show that the standard deviation of the total field and optical pump output synthesized from the corrected triaxial experimental data can be less than 0.2 nT.
Based on the demand of high-accuracy total field for airborne full-tensor gradiometer superconducting system,error-correction model was built depending on a kind of high-sensitivity LTS-SQUID 3-axial magnetometers to calibrate the zero deviation error,proportional factor error and non-orthogonal error.To solve the difficulty of algorithm optimization introduced by high SQUID reset zero-offset,zero-offset pre-correction scheme was proposed.Based on the pre-correction,adaptive genetic algorithm was used to solve the correction parameters.In addition,the forward modeling of the correction model was used to understand the distribution of the total field error.In the inversion simulation,the total field error of the forward modeling data can be corrected to the vicinity of 0.02 nT,in which the pre-correction scheme achieved the initial positioning of zero deviation.SQUID triaxial total field experiment was carried out under the quiescent and uniform earth magnetic field,and the data collected by optical pump magnetometer was regarded as the ideal total field.The experimental results show that the standard deviation of the total field and optical pump output synthesized from the corrected triaxial experimental data can be less than 0.2 nT.
引文
[1] HIROTA M,FURUSE T,EBANA K,et al.Magnetic detection of a surface ship by an airborne LTS SUQID MAD[J].IEEE Transcation on Applied Superconductivity,2001,11(1);884-887.
[2] LEI J,ZIQI G,BAOGANG Z.Scalar calibration of aeromagnetic data using BPANN and LS algorithms based on fixed-wing UAV platform[J].IEEE Transactions on instrumentation and Measurent,2015,64(7):1968-1975.
[3] GAVAZZI B,ALKHATIB-ALKONTAR R,MUNSCHY M,et al.On the use of fluxgate 3-Axis magnetometers in archaeology:application with a multi-sensor device on the site of qasr allam in the western desert of egypt[J].Archaeological Prospection,2016,24(1):59-73.
[4] BRONNER A,MUNSCHY M,SAUTER D,et al.Deep-tow 3C magnetic measurement:Solutions for calibration and interpretation[J]. Geophysics,2013,78(3):15-23.
[5] MUNSCHY M,BOULANGER D,Ulrich P,et al.Magnetic mapping for the detection and characterization of UXO:Use of multi-sensor fluxgate 3-axis magnetometers and methods of interpretation[J].Applied Geophysics,2007,61:168-183.
[6] SCH?NAU T,SCHMELZ M,ZAKOSARENKO V,et al.SQUID-based setup for the absolute measurement of the Earth’s magnetic field[J].Superconductor Science and Technology,2013,26:035013.
[7] SCH?NAU T,ZAKOSARENKO V,SCHMELZ M,et al.Absolute calibration of a three-axis SQUID-cascade vector magnetometer[J].Measurement Science and Technology,2017,28:015107.
[8] CLARK J,BRAGINKI A I.The SQUID Handbook Vol.I Fundamentals and Technology of SQUIDs and SQUID Systems[J].WILEY-VCH:WILEY-VCH Verlag GmbH & Co.KgaA,2004:29-344.
[9] 朱昀,董大群.三轴磁强计转向差的自适应校正[J].仪器仪表学报,1999,20(4):392-396.
[10] 林春生,向前,龚沈光.三轴磁强计正交误差分析与校正[J].探测与控制学报,2005,27(2):9-12.
[11] 吴德会,黄松岭,赵伟.基于FLANN的三轴磁强计误差校正研究[J].仪器仪表学报,2009,30(3):449-453.
[12] 甘攀,杨晓非,欧阳君.高精度嵌入式地磁测量仪的研究与实现[J].仪表技术与传感器,2015(11):45-48.
[13] 杨从锐,钱谦,王锋,孙铭会.改进的自适应遗传算法在函数优化中的应用[J/OL].[2017-03-31].http://www.arocmag.com/article/02-2018-04-039.html.
[14] 王一,宗发保,赵瑜,等.三分量磁通门传感器的三轴正交校正与测量[J].山东农业大学学报(自然科学版),2015,46(2):232-237.
[2] LEI J,ZIQI G,BAOGANG Z.Scalar calibration of aeromagnetic data using BPANN and LS algorithms based on fixed-wing UAV platform[J].IEEE Transactions on instrumentation and Measurent,2015,64(7):1968-1975.
[3] GAVAZZI B,ALKHATIB-ALKONTAR R,MUNSCHY M,et al.On the use of fluxgate 3-Axis magnetometers in archaeology:application with a multi-sensor device on the site of qasr allam in the western desert of egypt[J].Archaeological Prospection,2016,24(1):59-73.
[4] BRONNER A,MUNSCHY M,SAUTER D,et al.Deep-tow 3C magnetic measurement:Solutions for calibration and interpretation[J]. Geophysics,2013,78(3):15-23.
[5] MUNSCHY M,BOULANGER D,Ulrich P,et al.Magnetic mapping for the detection and characterization of UXO:Use of multi-sensor fluxgate 3-axis magnetometers and methods of interpretation[J].Applied Geophysics,2007,61:168-183.
[6] SCH?NAU T,SCHMELZ M,ZAKOSARENKO V,et al.SQUID-based setup for the absolute measurement of the Earth’s magnetic field[J].Superconductor Science and Technology,2013,26:035013.
[7] SCH?NAU T,ZAKOSARENKO V,SCHMELZ M,et al.Absolute calibration of a three-axis SQUID-cascade vector magnetometer[J].Measurement Science and Technology,2017,28:015107.
[8] CLARK J,BRAGINKI A I.The SQUID Handbook Vol.I Fundamentals and Technology of SQUIDs and SQUID Systems[J].WILEY-VCH:WILEY-VCH Verlag GmbH & Co.KgaA,2004:29-344.
[9] 朱昀,董大群.三轴磁强计转向差的自适应校正[J].仪器仪表学报,1999,20(4):392-396.
[10] 林春生,向前,龚沈光.三轴磁强计正交误差分析与校正[J].探测与控制学报,2005,27(2):9-12.
[11] 吴德会,黄松岭,赵伟.基于FLANN的三轴磁强计误差校正研究[J].仪器仪表学报,2009,30(3):449-453.
[12] 甘攀,杨晓非,欧阳君.高精度嵌入式地磁测量仪的研究与实现[J].仪表技术与传感器,2015(11):45-48.
[13] 杨从锐,钱谦,王锋,孙铭会.改进的自适应遗传算法在函数优化中的应用[J/OL].[2017-03-31].http://www.arocmag.com/article/02-2018-04-039.html.
[14] 王一,宗发保,赵瑜,等.三分量磁通门传感器的三轴正交校正与测量[J].山东农业大学学报(自然科学版),2015,46(2):232-237.