Configuration Design, Error Analysis And Underwater Target Detection Of Fluxgate Tensor Magnetometer

The aeromagnetic survey is not only an important part of geophysicalexploration and combination of magnetic exploration and aviation technology, butalso the focus of the national long-term development planning to support the content.With the improvement of electronic technology and data processing technology, theaeromagnetic survey has entered the stage of the measurement of magnetic tensor.Germany, the United States, Australia and other countries took the lead in research offull-tensor magnetic gradient detection system applied to aviation and achievedcertain results, but magnetic tensor detection and correlation technology is cutting-edge technology to restrict exports, we need to pay attention closely to it.Aeromagnetic survey started late in China, there is a blank in the field, so to developour own magnetic tensor system is of great significance.The purpose of this paper is to provide a reference for the optimization of themagnetic tensor system through the structural design of the fluxgate tensormagnetometer, analyze the error factors of instruments and explore fluxgate tensormagnetometer in aeromagnetic.The paper outlines the principle of detection by magnetic tensor and magnetictensor properties. According to the design concept of foreign magnetic tensor system,we adopt four high-precision three-axis air fluxgate magnetometers to build the tensorstructure, introduce five kinds of the basic structure of magnetic tensor respectively,cross, triangle, square, right angle tetrahedron and tetrahedral structure, push to therespective tensor formula, and simulation of the measurement characteristics, obtainthat the cross fluxgate tensor structure is the best, followed by a square, triangle,regular tetrahedron, rectangular tetrahedron and analyze errors of fluxgate tensormagnetometer. The errors of tensor meter have not only errors of a single fluxgate magnetometer, but also inconsistent errors of the performance of multiplemagnetometers. During the installation process, it may also introduce installation error.Moreover, in the detection process, in addition to interference by the geomagneticfield, it suffers hard-magnetic interference and soft-magnetic interference by aircraftand other electrical components. To take advantage of the characteristics that B_xyequals B_yxin tensor detection principle, we amend instrument measurement errors.From the simulation results, the error has been made better, but it can not completelybe corrected, the correction results are not reliable in the presence of geomagneticinterference especially.After the fluxgate tensor magnetometer prototype assembled, we use an iron ballwith magnetic materials uniformly distributed as the target of magnetic source tocarry out functional verification test indoors of the fluxgate tensor magnetometer. Thedetection results and the theoretical simulation results are the same, so it is provedthat the cruciform structure of fluxgate tensor magnetometer is workable. Combiningwith the aeromagnetic technical specification, we design the technology andoperational processes in connection with the fluxgate tensor magnetometer. Beforeflying in the field experiment flight, it needs to check the consistency of everychannel data of tensor meter. We propose the correlation coefficient as themeasurement standard. When the correlation coefficient is greater than0.8, it can beconsidered passing the consistency check. We adopt a crane as delivery platform anda moving car as detection target to carry on the field experiment of fluxgate tensormagnetometer. We obtain magnetic tensor components data, but it needs to becorrected because the value is not accurate under the influence of measurement errors.In recent years, our aquatic environment is continuously challenged. To solvethis problem, this paper puts forward the magnetic tensor method for underwatertarget detection. We define the search concept of magnetic tensor method, give adetection model and analyze the search performance of magnetic tensor method.Finally, this paper summarizes the work done in this article, analyzes theshortcomings of this study and prospects the next step work that will be to carry out.