直升机上航磁仪磁补偿的质量研究与探讨

The magnetic compensation quality study and discussion of aeromagnetic instrument on the helicopter

磁补偿飞行是通过硬件和软件技术有效地减弱飞机造成的磁干扰场和磁探头对航磁测量的影响,是提高航空磁测的测量精度的重要手段之一,在高精度航磁测量项目中必须进行磁补偿飞行。简单介绍了磁补偿原理,并结合AS350-B3型直升机磁补偿飞行实例,通过使用FOM值、NORM值、剩余方向差值这三个参数对磁补偿飞行效果进行评价,直观、准确地反应出干扰场的消除情况。通过分析背景磁场梯度等因素对磁补偿的影响,提出了对设计磁补偿飞行路径时,应以磁等值线线圈为主,并在飞行做动作时尽量兼顾测线方向和切割线方向的新思路。

Magnetic compensation flight,an effective means to reduce the influence of magnetic field and magnetic probe on the measurement of magnetic field by hardware and software technology'is one of the important means to improve the measurement accuracy of the aeromagnetic survey.In the high precision aerial magnetic survey project,we must carry out the magnetic compensation flight.This paper simply introduces the principle of magnetic compensation'combined with AS350-B3 helicopter magnetic compensation flight example'by using the FOM,NORM values and residual direction of the three parameters of the magnetic compensation for the evaluation of the effect of flight,intuitive and accurate response to the elimination of the interference field.By analyzing the background magnetic field gradient and other factors on the magnetic compensation,a new idea is put forward to design the flight path of magnetic compensation,which should be based on magnetic contour coil,and try to take into account the line direction and cutting line direction.