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为了检验和测试时间域航空电磁系统的测量精度和有效性,采用地面铺设闭合的异常线圈模拟地下有限导体的方法,将异常线圈的电磁响应理论值与系统实测数据进行拟合分析,来确定系统误差和飞行几何参数误差.在计算异常线圈电磁响应的基础上,研究了衰减曲线、剖面曲线与线圈的电性、几何参数关系,设计了野外测试实验方案.在长春市大鹅岛附近,采用吊车进行了系统测试,测试结果表明:单点实测数据的平均绝对误差为0.48 mV,系统相对误差小于1%,飞行高度误差为0.4 m、水平偏移误差为0.2 m.基于异常线圈进行时间域航空电磁系统的测试和标定,是一种准确、快速、经济可行的方法,具有野外施工便捷、参数调整灵活等特点,适用于任何时间域电磁测量系统的检测.
In order to test and test the measurement accuracy and effectiveness of the time-domain aeronautical electromagnetic system, a method of simulating the underground finite conductor with an abnormal coil wound on the ground is adopted. The theoretical value of the electromagnetic response of the abnormal coil is fitted with the measured data to determine the system Error and geometrical parameter error of the flight.On the basis of calculating the electromagnetic response of the abnormal coil, the relationship between the decay curve, the profile curve and the electrical and geometric parameters of the coil was studied and a field test program was designed.At the same time, The test results show that the average absolute error of a single point of measured data is 0.48 mV, the relative error of the system is less than 1%, the flight altitude error is 0.4 m, and the horizontal offset error is 0.2 m. The testing and calibration of aeronautical electromagnetic system is an accurate, rapid and economically feasible method with the advantages of convenient field construction and flexible parameter adjustment. It is suitable for the detection of electromagnetic measurement system in any time domain.