Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona
Concepts and procedures required for successful reduction of tensor magnetic gradiometer data obtained from an unexploded ordnance detection demonstration at Yuma Proving Grounds, Arizona
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成功减少从亚利桑那州尤马试验场未爆炸弹药探测演示中获得的张量磁梯度计数据所需的概念和程序
DOI：
10.3133/ofr20061027
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
P. Brown
中科院分区：
文献类型：
--
作者：
R. Bracken;P. Brown
2003 年 3 月 12 日，使用张量磁梯度计系统 (TMGS) 在亚利桑那州尤马试验场收集了数据。该报告显示了如何处理这些数据，并解释了成功 TMGS 数据缩减所需的概念。讨论的重要概念包括矢量测量的极端姿态灵敏度、梯度测量的低姿态灵敏度、共模场泄漏到梯度测量中、热漂移的后果以及场曲效应。讨论了空间数据收集程序和自旋校准方法。数据缩减程序的讨论包括通过数学匹配轴之间的传递函数来跟踪轴向数据、校准系数的推导和应用、传感器对梯度的计算、热漂移校正和梯度配置。为了演示，每个数据站的磁张量被转换为标量，即 I2 张量不变量，通过计算张量的行列式很容易找到它。在重要的处理时刻，映射区域中所有站点的决定因素都显示在阴影地形图视图中。最终处理结果与数学模型进行比较，以显示处理过程中所做假设的有效性以及所获得最终答案的合理性。
On March 12, 2003, data were gathered at Yuma Proving Grounds, in Arizona, using a Tensor Magnetic Gradiometer System (TMGS). This report shows how these data were processed and explains concepts required for successful TMGS data reduction. Important concepts discussed include extreme attitudinal sensitivity of vector measurements, low attitudinal sensitivity of gradient measurements, leakage of the common-mode field into gradient measurements, consequences of thermal drift, and effects of field curvature. Spatial-data collection procedures and a spin-calibration method are addressed. Discussions of data-reduction procedures include tracking of axial data by mathematically matching transfer functions among the axes, derivation and application of calibration coefficients, calculation of sensor-pair gradients, thermal-drift corrections, and gradient collocation. For presentation, the magnetic tensor at each data station is converted to a scalar quantity, the I2 tensor invariant, which is easily found by calculating the determinant of the tensor. At important processing junctures, the determinants for all stations in the mapped area are shown in shaded relief map-view. Final processed results are compared to a mathematical model to show the validity of the assumptions made during processing and the reasonableness of the ultimate answer obtained.