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频率域航空电磁系统线圈姿态变化影响及校正是一项探索性很强的开拓性工作,目前国内尚无成熟经验可循.吊舱式直升机频率域航空电磁法线圈安装在吊舱内,探头姿态变化相对较大,因此姿态校正提高了其数据处理精度,对提高航空电磁法数据处理水平具有重要意义.为了消除吊舱式直升机频率域航空电磁系统因收发线圈姿态发生变化,而导致的电磁探头接收地下地质体电磁响应数据产生的误差,采用三维频率域有限差分方法模拟计算频率域航空电磁系统的电磁响应,分析了不同频率、不同收发线圈姿态变化类型对水平共面(HCP,全称horizontal co-plane)和垂直同轴(VCX,全称vertical coaxial)线圈装置的电磁响应影响.计算结果表明:垂直同轴线圈装置因姿态角度变化引起的测量误差比值远大于水平共面装置,而且频率越高,受探头姿态角度变化的影响越大.垂直同轴装置主要受俯冲姿态变化的影响,水平共面装置受摇摆和俯冲这2种姿态变化的影响.在此基础上,根据姿态误差几何校正方法进行了电磁数据校正,有效地去除了因线圈姿态变化造成的误差响应.
Frequency domain Aeronautic electromagnetic system coil attitude change and correction is a highly exploratory pioneering work, at present there is no mature experience to follow. Pilz helicopter frequency domain aeromagnetic coil installed in the pod, the probe attitude So the attitude correction improves the data processing precision and is of great significance to improve the data processing level of the aeronautical electromagnetism method.In order to eliminate the change of the attitude of the transmitting and receiving coil of the aeronautical electromagnetic system in the podded helicopter in the frequency domain, The electromagnetic responses of the aeromagnetic system in the frequency domain were simulated by using finite difference method in the three-dimensional frequency domain. The horizontal co-planar (HCP) -plane and the vertical coaxial (VCX) coaxial coil.The results show that the ratio of measurement error due to the change of attitude angle of the vertical coaxial coil device is much larger than that of the horizontal coplanar device, and the higher the frequency is , The greater the impact of changes in the attitude of the probe. Vertical coaxial device Affected by the change of dive attitude, the horizontal coplanar unit is affected by two attitude changes: rocking and subduction.Based on this, the electromagnetic data is corrected according to the attitude error geometric correction method, which effectively eliminates the change of attitude caused by the coil Error response.