【摘要】 为实现地磁背景下微弱磁异常目标的远距离探测,解决地磁背景信号远大于目标磁异常信号,导致测试系统分辨率和探测能力受限的问题,文中设计了由测量和补偿2个三轴磁通门磁强计构成的实时动态地磁补偿系统。推导了三轴磁通门磁强计非正交、灵敏度和零点误差对测量结果的影响方式,提出了通过电路参数的合理匹配和优化设计实现转向差校正和地磁补偿的硬件技术方案。实验证明该方案有良好的转向差校正和地磁补偿效果,可以为磁异常信号提供更大的增益范围,能够实现对微小磁异常信号的实时提取与动态检测,具有较好的工程应用价值。更多还原

【Abstract】 In order to detect the weak magnetic anomaly targets in a long distance under the geomagnetic environment, and to get rid of the limitations of the test system resolution and detection ability, which result from that the geomagnetic signal intensity is much larger than the magnetic anomaly signal intensity, a real-time dynamic geomagnetic compensation system with two tri-axis fluxgate magnetometers was designed.The influence of non-orthogonality, sensitivity and zero error of the tri-axis fluxgate magnetometer on the measurement results was studied, and a hardware technical solution was proposed to realize steering error correction and geomagnetic compensation by reasonably matching and optimizing the circuit parameters.Experiments show that the scheme has good effect of correction of steering error and geomagnetic compensation, which can provide a larger gain range for the magnetic anomaly signals, and realize real-time extraction and dynamic detection of the weak magnetic anomaly signals, it has good engineering application value.更多还原