| 摘要: |
| Tolles-Lawson(T-L)补偿模型广泛应用于航磁干扰补偿。该模型假设地磁场恒定，不考虑地磁梯度，导致磁补偿精度低，且传统磁补偿评价方法仅分析磁补偿后的残差，缺乏对航向误差磁补偿精度的评价。针对这一问题，基于实飞数据分析了地磁梯度对校准飞行航磁补偿的影响，推导了地磁梯度与磁探系统中经纬高的数学解析式，建立了一种新型抗地磁梯度的T-L (AGG T-L)模型，并提出了航向误差补偿的评价方法，即统计不同航向航线重叠点的磁场误差RMS。实测结果表明，补偿后航向误差RMS从3.542 6 nT降为 0.935 8 nT，证明改进的模型对航向误差具有较好的补偿效果。 |
| 关键词: 磁干扰补偿 T-L模型 地磁梯度 航向误差 |
| DOI： |
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| 基金项目:基础科研项目（JCKY2022110C165） |
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| Novel anti-geomagnetic gradient aeromagnetic interference compensation model and evaluation method |
| TIAN Haonan,HAN Dapeng,ZHANG Dengwei,ZHANG Zhihang,SU Baoyu,LIAO Youxing |
| (College of Optical Science and Engineering, Zhejiang University, Hangzhou 310000, China;Institute of Advanced Technology, Zhejiang University, Hangzhou 310000, China;The 27th Research Institute of China Electronics Technology Group Corporation, Zhengzhou 450000, China) |
| Abstract: |
| The Tolles-Lawson (T-L) compensation model is widely used for magnetic interference compensation in airborne magnetic surveys. This model assumes a constant geomagnetic field and does not consider geomagnetic gradient effects, which leads to low magnetic compensation accuracy. In addition, traditional magnetic compensation evaluation methods only analyze the residuals after compensation, lacking an assessment of the magnetic compensation accuracy regarding heading errors. To address this problem, the effect of geomagnetic gradients on the calibration of airborne magnetic compensation during calibration flights is analyzed based on actual flight data. And the mathematical analysis expressions relating geomagnetic gradients to the geographical coordinates (latitude and longitude) and altitude in the magnetic exploration system are derived. A novel anti-geomagnetic gradient T-L (AGG T-L) model is established, and an evaluation method for heading error compensation is proposed, which involves statistical analysis of the root mean square (RMS) of magnetic field errors at overlapping points along different flight paths. The results show that the RMS of the heading error decreases from 3.542 6 nT to 0.935 8 nT after compensation, indicating that the improved model provides effective heading error compensation. |
| Key words: Magnetic interference compensation Tolles-Lawson(T-L) model Geomagnetic gradient Heading error |
