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为解决地面人员难以到达的特殊区域大比例尺磁测数据获取问题，本文提出一种基于三轴磁通门传感器，采用旋翼无人机进行航空磁测的方法.项目组研制适合旋翼无人机搭载的航磁数据记录仪，并完成旋翼无人机、三轴磁通门传感器、航磁数据记录仪的集成工作，开展了三轴磁通门传感器安装点位噪声水平试验、地面空中对比试验、磁性体识别试验、动态飞行一致性试验、区域飞行试验.旋翼无人机航磁系统具有操作简单、设备轻便、效率高的特点，能在地面人员难以达到的区域开展低空航磁测量.中国四川省黑竹沟地区是地磁异常区域，项目组在该区域内的沟壑、峡谷、湖泊等实地开展了野外应用测试，完成了这些特殊区域的航磁调查工作. 相似文献
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《地球物理学进展》2017,(4)
航磁磁场水平调整是压制非地质因素对磁场的干扰,还原磁场本来面貌的重要手段,传统方法主要为切割线调平和微调平,但在弱磁场区实测磁场面貌不清晰,干扰异常影响突出,使用常规磁场水平调整方法难以达到理想的处理效果.本文针对黔东地区航磁弱异常,在介绍弱磁场成因、磁场水平误差表现形式的基础上,对该地区磁场水平进行了调整.为获得较好的磁场水平调整效果,使用了弱磁场区水平调整方法,并针对弱磁场区高压线等干扰异常明显的特点,利用该方法对区内高压线干扰异常进行处理,处理后的磁场趋势更合理,磁场面貌更清晰,突出了微弱局部异常,更好地满足后续数据转换处理和地质解释的需要. 相似文献
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准确的磁场测量对深入研究空间等离子体环境具有重要意义.星载磁通门磁强计的磁补偿随时间缓慢变化，因此，需要对其进行常规的在轨标定.现有的在轨标定方法都依赖于磁扰动或磁结构事件的筛选，导致标定结果的频次受限于事件的筛选，且差的事件还会增大计算误差.为此，本文研发出一种不依赖于磁场事件筛选的在轨标定新方法.根据行星际磁场强度的取值范围，我们可建构一个磁补偿取值空间.不同的磁补偿值会影响行星际磁场的阿尔芬特性；于是，我们通过在磁补偿空间中找到使被调整之后的行星际磁场的阿尔芬特性最强的点作为磁补偿值的最优解.测试结果表明，我们的新方法可以利用1～4 h时长的行星际磁场数据获得误差小于0.1 nT的标定结果. 相似文献
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为了评价航磁成图数据精度，通常在完成精细调平等处理后依据航空磁测总精度评价方法进行评价.但经过精细调平或反复调平可以使成图数据精度达到很高，不能反应实际情况.针对这一问题，本文提出了一种基于位场曲面延拓的航磁成图数据精度评价方法，该方法是将航磁数据经各项改正后、精细调平前的测线数据通过非规则网延拓算法延拓至切割线测点(或交叉点)处，再计算二者的均方根偏差来进行精度评价.该精度评价方法不需要经过精细调平也可避免多次调平，不需要舍弃交叉点，并且克服了交叉点处点位坐标不一致的问题，可以客观地评价航磁成图数据的精度，也作为评价航磁数据精度的一种新方法，同时也可用该曲面延拓方法进行曲面数据处理成图.通过模型测试和实际资料处理，验证了该方法的正确性和实用性. 相似文献
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基于welch算法的经典功率谱估计对新疆区域内乌鲁木齐台、喀什台和且末台的3台GM4磁通门磁力仪磁扰日时段的秒数据进行分析。实验首先分别对3台GM4秒数据的高频数据进行FFT分析,磁扰日时段3台GM4秒数据受磁扰较为明显的频段均集中在0. 005～0. 025 Hz,此频段内振幅较大,突跳点较多。实验基于welch算法的功率谱估计对3台GM4秒数据进行功率谱分析,频率域采用受磁扰较为集中的频段,结果表明:3台GM4秒数据受到的干扰主要为地磁场的高频部分,干扰的频段范围集中在0. 002～0. 006 Hz内,H分量数据波动较大,在该频段内数据曲线出现毛刺和高频震荡现象; D分量在此频段内有轻微波动; Z分量数据整体较为平滑,受扰最小。 相似文献
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在对全国地磁台站磁通门磁力仪记录数据的质量效能评估中发现,多个台站存在同台观测仪器的记录数据曲线不一致问题.针对这类问题,研究人员对多种地磁观测数据影响因素进行了定性或定量的分析.本文通过分析格值系数及姿态角对磁通门磁力仪记录数据的影响规律,建立磁通门磁力仪三轴校正模型,构建目标函数,并利用遗传算法对模型进行求解,测定仪器姿态角和格值系数,根据测定结果对记录数据进行一致性校正.数值模拟计算和台站实测实验结果表明:利用该算法解算的格值系数精度优于0.002,姿态角精度优于0.15°.根据解算结果计算,日变幅为50 nT时引入的日变形态不一致误差小于0.13 nT,满足国家地磁台网对地磁相对记录数据日变形态不一致误差的要求. 相似文献
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地磁台站观测有相对记录和绝对观测2种，相对记录数据需经基线值改正后方可得到地磁场要素的实际值.磁通门经纬仪是获取基线值的基本设备之一，在地磁观测中发挥着重要作用.目前台站采用的磁通门经纬仪需人工操作，人为因素会对观测数据质量产生影响，因在偏远地区和环境恶劣地区无法实现地磁绝对观测，造成地磁绝对观测的空间覆盖空白.子午工程二期将在我国大陆地区首次开展自动化磁偏角和磁倾角地磁绝对观测，必将推动地磁绝对观测技术创新与发展.自动磁通门经纬仪是我国自主研发的磁偏角和磁倾角自动化观测设备，采用无磁材料和压电电机，通过优化设计与改进加工工艺，以及引入多参量误差补偿算法，有效克服和消除了系统误差，提高了测量精度.该设备在河北涉县台、吉林合隆台、陕西乾陵台和北京白家疃台等台站开展了长时间的实际观测，并与台站的人工磁通门经纬仪观测结果进行了对比.结果表明，自动磁通门经纬仪的主要性能指标达到了人工磁通门经纬仪水平.该设备也通过了中国地震局前兆设备入网测试，功能和性能指标符合地磁台站地磁绝对观测要求. 相似文献
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The inversion of density structure by graphic processing unit (GPU) and identification of igneous rocks in Xisha area 
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下载免费PDF全文 Organic reefs, the targets of deep-water petroleum exploration, developed widely in Xisha area. However, there are concealed igneous rocks undersea, to which organic rocks have nearly equal wave impedance. So the igneous rocks have become interference for future exploration by having similar seismic reflection characteristics. Yet, the density and magnetism of organic reefs are very different from igneous rocks. It has obvious advantages to identify organic reefs and igneous rocks by gravity and magnetic data. At first, frequency decomposition was applied to the free-air gravity anomaly in Xisha area to obtain the 2D subdivision of the gravity anomaly and magnetic anomaly in the vertical direction. Thus, the distribution of igneous rocks in the horizontal direction can be acquired according to high-frequency field, low-frequency field, and its physical properties. Then, 3D forward modeling of gravitational field was carried out to establish the density model of this area by reference to physical properties of rocks based on former researches. Furthermore, 3D inversion of gravity anomaly by genetic algorithm method of the graphic processing unit (GPU) parallel processing in Xisha target area was applied, and 3D density structure of this area was obtained. By this way, we can confine the igneous rocks to the certain depth according to the density of the igneous rocks. The frequency decomposition and 3D inversion of gravity anomaly by genetic algorithm method of the GPU parallel processing proved to be a useful method for recognizing igneous rocks to its 3D geological position. So organic reefs and igneous rocks can be identified, which provide a prescient information for further exploration. 相似文献
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The inversion of density structure by graphic processing unit （GPU） and identification of igneous rocks in Xisha area 总被引：1，自引：0，他引：1
Organic reefs, the targets of deep-water petroleum exploration, developed widely in Xisha area. However, there are concealed igneous rocks undersea, to which organic rocks have nearly equal wave impedance. So the igneous rocks have become interference for future exploration by having similar seismic reflection characteristics. Yet, the density and magnetism of organic reefs are very different from igneous rocks. It has obvious advantages to identify organic reefs and igneous rocks by gravity and magnetic data. At first, frequency decomposition was applied to the free-air gravity anomaly in Xisha area to obtain the 2D subdivision of the gravity anomaly and magnetic anomaly in the vertical direction. Thus, the distribution of igneous rocks in the horizontal direction can be acquired according to high-frequency field, low-frequency field, and its physical properties. Then, 3D forward modeling of gravitational field was carried out to establish the density model of this area by reference to physical properties of rocks based on former researches. Furthermore, 3D inversion of gravity anomaly by genetic algorithm method of the graphic processing unit(GPU) parallel processing in Xisha target area was applied, and 3D density structure of this area was obtained. By this way, we can confine the igneous rocks to the certain depth according to the density of the igneous rocks. The frequency decomposition and 3D inversion of gravity anomaly by genetic algorithm method of the GPU parallel processing proved to be a useful method for recognizing igneous rocks to its 3D geological position. So organic reefs and igneous rocks can be identified, which provide a prescient information for further exploration. 相似文献
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四川盆地及其西部边缘震区基底磁性界面与地震的研究 总被引：5，自引：0，他引：5
在对四川盆地及其西部边缘震区航磁资料进行分析研究的基础上，依据频率域磁性单界面反演方法对航磁异常进行了数据处理，求取了基底磁性界面的定量埋深，结合区域构造特征，地热分布及板块运动对地震的孕育环境进行了综合研究和讨论。 相似文献
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PRABHAKAR S. NAIDU 《Geophysical Prospecting》1969,17(3):344-361
An efficient method of computing spectrum and cross-spectrum of large scale aero-magnetic field (or of any other two-dimensional field) has been developed and programmed for a digital computer. The method uses fast Fourier transform techniques. Briefly, the method is as follows: a digitized aeromagnetic map is divided into a number of rectangular blocks. Fourier transforms of these blocks are computed using a two-dimensional fast Fourier transform method. Finally, the amplitude of the Fourier transforms is averaged to give the desired spectrum. Computation of cross-spectrum follows the same lines. In fact, the same programme may be used to a compute the spectrum as well as cross-spectrum. The method has a number of computational advantages, in particular it reduces greatly computational time and storage requirements. The programme has been tested on synthetic data as well as on real aeromagnetic data. It took less than 30 seconds on an IBM 360/50 computer to compute the spectrum of an aeromagnetic map covering an area of approximately 4500 square miles. 相似文献
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为识别及分析浚县地震台地磁秒采样观测数据中的高频干扰成分,采用别尔采夫滤波剔除其日波及半日波,然后通过时频分析得到高频干扰时段。通过查询工作日志及进行毕奥萨伐尔定律分析,认为浚县地震台地磁秒采样数据所受高频干扰除磁暴外,主要来自电焊施工和雷电,同时发现2种干扰类型有不同的典型干扰形态。 相似文献
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实测航磁横向水平梯度反映垂直于测线的磁场梯度,比传统航磁ΔT数据包含测线之间更多的磁场信息.针对航磁数据网格化问题,采用Hardwick提出的方法,利用航磁水平梯度与ΔT数据构建拟测线,并结合Akima插值法,开展了双方向测线型ΔT网格化方法研究,最终实现了考虑航磁水平梯度变化的ΔT网格化;针对网格化结果中的虚假异常采取了有效滤波方法.通过理论模型数据和实际数据网格化处理,表明该方法可以突出航磁测线之间的异常细节、更清晰地反映线性构造或磁性体走向,提高了网格化的精度和分辨率. 相似文献
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文中给出了根据地震释放的总地震矩求解平均应力场的方法,并使用加入随机误差的人工合成震源机制解数据和唐山余震区震源机制解数据对其进行检验。由检验结果可知,该方法可以应用于区域平均应力场的求解。使用的震源机制解资料越多,所得结果越稳定,且更接近真实的区域应力场。该方法的优点是: 用每个地震的震级作为权重,能够较好地反映出大小地震在应力场反演中的不同贡献; 并且在计算过程中不需要知道震源机制解2个节面中哪个节面为地震断层面。 相似文献