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| Elimination of steering difference in aeromagnetic gradient measurement using internal accord accuracy for test repeat line in aeromagnetic survey |
| Jian LIANG1, Dao-Ze ZHUANG2, Yu-Feng GUO1, Wang YANG1 |
1. Geophysical Exploration Academy of China Metallurgical Geology Bureau,Baoding 071051,China
2. Bureau of Geology and Mineral Resources Exploration and Development of Xinjiang, Urumqi 830000,China |
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Abstract This paper points out that the previous calculation formula of the accuracy of the airborne gravity and magnetic survey does not conform to the statistical principle. The authors present a new calculating formula, which unifies not only the consistency of multi-instrument precision calculation for gravity and magnetic measurement on ground but also total precision calculation formula for airborne gravity and magnetic measurement using the intersection of survey line and tie line, and can be applied to aeromagnetic gradient measurement to eliminate gradient steering difference and to evaluate the accuracy of the gradient measurement system.
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Received: 30 December 2016
Published: 04 June 2018
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| 1号探头/nT | 2号探头/nT | 3号探头/nT | 4号探头/nT | | 0° | -0.5285307687156141 | -0.5938423666072024 | 0.8312815518393176 | 0.2915311642938796 | | 90° | -0.5197623966896682 | -0.4403397154612402 | 0.6405934027202965 | 0.3195007208107127 | | 180° | -0.5899086526369078 | -0.3399342043794137 | 0.9924406460766684 | -0.0667719429119522 | | 270° | -0.4991288138970681 | -0.5046416770417679 | 0.8685583314799767 | 0.1353263612624347 | | 内符合精度 | 0.5361862509490541 | 0.4868373698971536 | 0.846155953833143 | 0.2321164915774039 | | 总精度 | 0.656852161018662 |
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| 1号探头/nT | 2号探头/nT | 3号探头/nT | 4号探头/nT | | 0° | 0.015297704698418 | 0.0101696822821069 | 0.0158698308324947 | 0.018645771890485 | | 90° | 0.0066471146271898 | 0.0139827153611879 | 0.0079991965992842 | 0.0114905530037505 | | 180° | 0.0104115538219807 | 0.0271337880464745 | 0.0300916472247034 | 0.0213083517338155 | | 270° | 0.0074237272896437 | 0.0147040325161841 | 0.0111155589450553 | 0.009196504666883 | | 内符合精度/nT | 0.0109952508728542 | 0.0174781550540096 | 0.018523947143738 | 0.0163486573986367 | | 总精度/nT | 0.0185902901391291 |
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| x方向梯度/(pT/m) | y方向梯度/(pT/m) | z方向梯度/(pT/m) | | 0° | 7.918254073475 | 5.269886898420 | 6.386599562450 | | 90° | 5.618693071148 | 4.737651809021 | 2.750794712067 | | 180° | 9.126889912194 | 14.280973532021 | 5.173281582975 | | 270° | 5.897774739030 | 4.261252718721 | 3.964132836451 | | 总噪声水平/(pT/m) | 7.400698472359 | 8.246677420401 | 4.935249534654 |
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| x方向梯度/(pT/m) | y方向梯度/(pT/m) | z方向梯度/(pT/m) | | 0° | 7.891094367541 | 5.353451252041 | 6.354018188118 | | 90° | 5.485889672940 | 4.864836034794 | 2.795427426588 | | 180° | 8.974530273678 | 14.203122283713 | 5.623773726930 | | 270° | 6.088297048451 | 3.891321292421 | 4.057542818538 | | 总噪声水平/(pT/m) | 7.358282103413 | 8.205021353050 | 5.065314631441 |
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| x方向梯度/(pT/m) | y方向梯度/(pT/m) | z方向梯度/(pT/m) | | 测线方向 | 47.2734597845345 | 559.6277155395362 | 59.6560139466257 | | 切割线方向 | 493.8845107917437 | 118.7910771059847 | 8.1289605731606 | | 总内符合精度/(pT/m) | 340.9212225720188 | 414.8794885264877 | 43.7203613891743 |
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| x方向梯度/(pT/m) | y方向梯度/(pT/m) | z方向梯度/(pT/m) | | 测线方向 | 5.9732738092272 | 10.9558203709261 | 4.2848570571257 | | 切割线方向 | 5.1516987489565 | 4.7507894080879 | 2.8035691537752 | | 总内符合精度/(pT/m) | 5.6008927859762 | 8.6058119895801 | 3.6619666847201 |
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