Study On The Key Technique Of Aeromagnetic Compensation Under Small Geomagnetic Inclination Condition

When conducting aeromagnetic measurement under the condition of small geomagnetic inclination Angle,it will face some special error sources,which will affect the precision of magnetic field measurement and aeromagnetic compensation.One of the most significant is optically pumped magnetometer to heading error,under the condition of small dip in optically pumped magnetometer optical axis and the Angle between the magnetic field is easy to light near the "dead zone" of pump magnetometer,magnetic field and output signal lost linear relationship;At the same time,the number of abnormal data points/segments in the magnetic measurement data of the whole section also increases correspondingly,so higher requirements are put forward in data processing methods and tools.Under the condition of small geomagnetic inclination aviation magnetic survey,the author of this paper,the key problem of optically pumped magnetometer to heading error calibration was studied and the key problems,such as magnetic survey data processing,and related data processing software is developed.The main innovative work completed in this paper mainly includes:Firstly,the mathematical model of the heading error of the optical pump magnetometer is derived,and the calibration method of the heading error of the optical pump magnetometer for aeromagnetic measurement under the condition of small geomagnetic inclination Angle is proposed.According to the optical axis pump magnetometer and geomagnetic field Angle and magnetometer output signal,the relationship between the proposed small dip to air pump magnetometer magnetic survey application under the condition of light heading error calibration and compensation method;Second,according to the actual air composition of magnetic surv ey system conditions and the proposed heading error calibration method,based on the ground without magnetic experiment platform of optically pumped magnetometer to heading error calibration experiment scheme,through the ground test to obtain the real magnetic field under the condition of caesium optically pumped magnetometer to difference and the relationship between the geomagnetic field euler Angle,then according to the steering error compensation method for the calibration and compensation,the experimental data show the effectiveness of the proposed method;Third,in view of the small geomagnetic inclination airborne magnetic survey data under the condition of abnormal data points/segment is more on the situation,put forward the aeromagnetic data automatic screening based on sample space partition algorithm and maneuver of the disturbance of variance based on the algorithm,the abnormal data can be automatically screening and calibration maneuver of automatic identification,so as to improve the overa ll quality of the airborne magnetic survey data,and the solution is for aeromagnetic compensation coefficient laid the foundation of data quality,improve the accuracy of the aeromagnetic compensation;Fourth,in the face of aeromagnetic compensation under the condition of small geomagnetic inclination data processing and analysis of requirements,design and develop the aeromagnetic data post-processing and analysis software platform,will turn to difference compensation,automatic aeromagnetic data filter ing,aerial magnetic disturbance compensation and the key algorithms are integrated into the software,and from the Angle of software human-computer interaction design specification of the post processing of the aeromagnetic data of the process,for airborne magnetic survey data analysis and related research provides an efficient auxiliary analysis software platform.