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    频率域航空电磁系统线圈姿态变化影响及校正方法

    王卫平 曾昭发 吴成平

    王卫平, 曾昭发, 吴成平, 2015. 频率域航空电磁系统线圈姿态变化影响及校正方法. 地球科学, 40(7): 1266-1275. doi: 10.3799/dqkx.2015.106
    引用本文: 王卫平, 曾昭发, 吴成平, 2015. 频率域航空电磁系统线圈姿态变化影响及校正方法. 地球科学, 40(7): 1266-1275. doi: 10.3799/dqkx.2015.106
    Wang Weiping, Zeng Zhaofa, Wu Chengping, 2015. Coil Attitude Influence and Attitude Correction Method for Frequency Domain Airborne Electromagnetic System. Earth Science, 40(7): 1266-1275. doi: 10.3799/dqkx.2015.106
    Citation: Wang Weiping, Zeng Zhaofa, Wu Chengping, 2015. Coil Attitude Influence and Attitude Correction Method for Frequency Domain Airborne Electromagnetic System. Earth Science, 40(7): 1266-1275. doi: 10.3799/dqkx.2015.106

    频率域航空电磁系统线圈姿态变化影响及校正方法

    doi: 10.3799/dqkx.2015.106
    基金项目: 

    国家自然科学基金项目 41174097

    国家矿保工程"高精度航空物探方法研究"项目 1212011087010

    详细信息
      作者简介:

      王卫平(1963-), 男, 硕士, 教授级高级工程师, 主要从事航空物探成果解释和方法研究工作以及航空电磁法方法研究和成果解释工作.E-mail: 911733417@qq.com

    • 中图分类号: P631

    Coil Attitude Influence and Attitude Correction Method for Frequency Domain Airborne Electromagnetic System

    • 摘要: 频率域航空电磁系统线圈姿态变化影响及校正是一项探索性很强的开拓性工作, 目前国内尚无成熟经验可循.吊舱式直升机频率域航空电磁法线圈安装在吊舱内, 探头姿态变化相对较大, 因此姿态校正提高了其数据处理精度, 对提高航空电磁法数据处理水平具有重要意义.为了消除吊舱式直升机频率域航空电磁系统因收发线圈姿态发生变化, 而导致的电磁探头接收地下地质体电磁响应数据产生的误差, 采用三维频率域有限差分方法模拟计算频率域航空电磁系统的电磁响应, 分析了不同频率、不同收发线圈姿态变化类型对水平共面(HCP, 全称horizontal co-plane)和垂直同轴(VCX, 全称vertical coaxial)线圈装置的电磁响应影响.计算结果表明: 垂直同轴线圈装置因姿态角度变化引起的测量误差比值远大于水平共面装置, 而且频率越高, 受探头姿态角度变化的影响越大.垂直同轴装置主要受俯冲姿态变化的影响, 水平共面装置受摇摆和俯冲这2种姿态变化的影响.在此基础上, 根据姿态误差几何校正方法进行了电磁数据校正, 有效地去除了因线圈姿态变化造成的误差响应.

       

    • 图  1  线圈姿态变化

      φyφpφr分别表示偏航、俯仰、摇摆3种姿态变化角度

      Fig.  1.  Coils attitude changes

      图  2  Yee非均匀网格剖分示意

      Fig.  2.  Non-uniform Yee grid

      图  3  HEM计算模型示意

      Fig.  3.  The 3D model of HEM calculation

      图  4  不同埋深目标体电磁响应信号

      Fig.  4.  The electromagnetic response of components with different depths

      图  5  三维频率域有限差分计算结果对比曲线

      Fig.  5.  The comparison of calculation results for 3D frequency domain finite difference method

      图  6  线圈姿态变化影响计算模型

      Fig.  6.  The calculation model of coil attitude changes

      图  7  不同角度VCX装置俯冲姿态变化Hx二次场响应

      Fig.  7.  The normalized secondary field of Hx in pitch with different angles (VCX)

      图  8  不同角度HCP装置俯冲姿态变化Hz二次场响应

      a.摇摆姿态;b.俯冲姿态

      Fig.  8.  The normalized secondary field of Hz in HCP with different angles

      图  9  不同角度不同频率条件下2种装置姿态变化电磁响应归一化比值对比

      a.水平共面装置实分量; b.水平共面装置虚分量; c.垂直同轴装置实分量

      Fig.  9.  The comparison of normalized secondary field response in VCX and HCP coil with different frequencies

      图  10  连续角度姿态变化模型

      Fig.  10.  The calculation model of pitch along fly line

      图  11  水平共面装置2种姿态变化Hz分量响应信号

      Fig.  11.  The secondary field of Hz in HCP with pitch and roll

      图  12  垂直同轴装置俯冲姿态变化Hx分量响应信号及校正结果

      Fig.  12.  The secondary field of Hx in VCX with pitch and calibration result

      图  13  模拟连续探头姿态角度变化曲线

      Fig.  13.  The curve of continuous angles for simulated sensor attitude variation

      图  14  北京密云红光铁矿地区10号线HCP装置实虚分量探头姿态校正结果对比

      Fig.  14.  Comparion map of sensor attitude correction for HCP system of Line 10 in Miyun Hongguang iron ore, Beijing

      表  1  不同装置、不同角度、不同频率归一化二次场电磁响应

      Table  1.   The normalized secondary field response in VCX and HCP coil with different angles and frequencies

      角度变化 水平共面(HCP),摇摆姿态 水平共面(HCP),俯冲姿态 垂直同轴(VCX),摇摆姿态
      Hz虚分量/Hz实分量 Hz虚分量/Hz实分量 Hx虚分量/Hx实分量
      930Hz 4650Hz 23250Hz 930Hz 4650Hz 23250Hz 870Hz 4350Hz 21750Hz
      11.7610 3.0848 1.4069 12.633 2.8473 1.2554 4.8085 1.8657 1.2596
      11.7460 3.0817 1.4045 12.619 2.8440 1.2536 4.7382 1.8305 1.2360
      11.7370 3.0833 1.4015 12.611 2.8398 1.2509 4.6944 1.8085 1.2209
      12° 11.7240 3.0825 1.3989 12.600 2.8313 1.2451 4.6220 1.7773 1.1991
      16° 11.7110 3.0817 1.3970 12.592 2.8194 1.2368 4.5662 1.7431 1.1747
      20° 11.6970 3.0809 1.3946 12.585 2.8039 1.2258 4.4921 1.7047 1.1465
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