Research On Key Technology Of Error Correction And Data Acquisition In Aeromagnetic Compensation

Airborne magnetic detection is a magnetic measurement technology based on aviation platforms. It is widely used in geological structures, magnetic mapping, urban and engineering stability exploration mission. Aeromagnetic compensation is the key of data processing system in aeromagnetic exploration. The purpose is to eliminate the interference generated by the magnetic field of aviation platform itself. In this paper, we research on aeromagnetic compensation correction error sensor and data acquisition technology. Fusion algorithm is proposed to improve the measurement accuracy of the flux gate attitude, and the data acquisition and processing system based on PXI platform is designed and developed. We solve the key problems of data acquisition and high-precision synchronization to provide a reliable guarantee for high accuracy of aeromagnetic compensation. The main work and achievements of this paper include:First, get calculation method and the error model of direction cosine, which is the key measure of aeromagnetic data for the compensation system. On the basis of in-depth analysis of the working principle of the fluxgate sensor, sources of error fluxgate magnetic field direction angle measurements were analyzed and modeling. Advantages proposed correction algorithm based on linear regression Bisquare, the householder matrix factorization algorithm parameter identification error, with high precision and high time efficiency.Second, the proposed algorithm based on data fusion technology upgrade, can get more accurate data direction cosine. Data fusion model algorithm based on physical relevance of fluxgate magnetometer, optically pumped and laser gyro, builds on the time-series model. Select the appropriate integration parameters as optimization criterion. Simulation results show that the algorithm can be based on linear regression algorithm based on Bisquare to further improve the accuracy of the direction cosine.Third, the actual detection system aeromagnetic data collection requirements, design and develop the aeromagnetic data detection system and match real precision data acquisition systems. Designing PXI platform for measurement and control framework, based on the sensor measurement accuracy including the frequency counting module and analog to digital conversion module. Using Lab VIEW develops user interface. Tests show that the system performance and functionality indicators.