Research On Multiple Underwater Magnetic Targets Localization Algorithm Of Euler Deconvolution

Geomagnetic aided navigation system used for navigation and positioning is based on the principle of geomagnetic matching navigation and positioning, the accuracy of the geomagnetic aided navigation system has a direct relationship with the precision of the Earth’s magnetic anomaly map, at the same time, the pssitioning technology of underwater multiple magnetic targets is not only important for the precise drawing of the magnetic anomaly maps,but also for the underwater vehicle geomagnetic aided navigation system. By using aeromagnetic data or magnetic field data obtained by magnetic field measuring device on underwater vehicle to position multiple magnetic targets underwater and map the distribution of seabed magnetic anomaly maps,we can position through matching the magnetic anomaly data measured by underwater vehicle with the seabed magnetic anomaly maps stored in the computer previously, and then cooperate with the inertial navigation system to ensure the safety and hiddenness of voyage of underwater vehicle in wartime.Precise positioning of magnetic targets is based on the accuracy of measure data.Magnetic field produced by underwater vehicle due to the impact of the geomagnetic field and measurment error by magnetic devices itself can have great impact on the accuracy of the measurement data. So before studying the multi-magnetic targets underwater localization, this article analyzed the error sources of the magnetic field measurement data firstly. Taking the submarine as an example, finite element analysis software ANSYS is used to build a submarine model for magnetic analysis and to simulate the magnetization of geomagnetic field, relationship matrices between geomagnetic and attitude angle of submarine are obtained under reality . The simulation results showed that data from the relationship matrix have high correlation with ANSYS simulation data, and validated the accuracy of the induced magnetic field model. On this basis, this article anaalyzed the error sources of the magnetic field measurement device, considering various error factors, combined with analysis of submarine magnetization field model and designed error correction network using all the errors corrected coefficient obtained by correction network estimation to compensate system error compensation, and got highly accurate field data.Euler deconvolution method widely used in inversion of gravity and magnetic anomaly data is used to research positioning of multiple magnetic targets. This paper also introduced some key technologies between traditional Euler deconvolution inversion method, improved method and magnetic target Euler deconvolution inversion method, analyzed the selection of magnetic target structure index and the problem of divergent of Euler solution. These key technologies have a very important influence on the stability and accuracy of the Euler solution. Finally, this article simulated and analyzed the improved Euler deconvolution method based on linear regression theory, multiple magnetic targets regional model were constructed through mathematical models of two simple magnetic anomalies, and the improved Euler deconvolution inversion methods were applied to inversion of multiple magnetic targets in measurement region, to obtain each magnetic target position information.The simulation results had little difference with the real position of the magnetic target, and multi-magnetic target underwater localization was carried out.