The Study About The Influence Of Rov’s Exteior To The Geomagnetic Measurements

Geomagnetic field is natural resources of the Earth and it can provide naturalcoordinates for aviation, navigation and underwater operations for it’s slowly changing withtime. Preparation of geomagnetic database, acquisition of geomagnetic data and navigationmatching geomagnetic field are three modules of navigation using geomagnetic field.Navigation matching geomagnetic field is relatively mature and preparation of geomagneticdatabase has a significant progress. However there is not a good solution for obtaining thereal-time geomagnetic data. The main reason is the value measured by magnetic sensorinstalled on the carrier is the total magnetic field value made by geomagnetic field,magnetized field and other interference field. So the interference field must be compensatedform measured magnetic field data.The magnetized field of carrier shell is the main interference for affecting measurementaccuracy of geomagnetic field. In order to get geomagnetic data with high accuracy theinterference field of Remotely Operated Vehicle (ROV) must be compensated from thevalue measured by geomagnetic sensor. This paper proposes the near-field model of twelvemagnetic dipoles and the near-field model of seven magnetic dipoles separately through thelocation of the two main interference source of ROV. The value of the two magnetized fieldin ROV is deduced and is simulated by Mathematica. Two height and different directions ofROV is measured in a certain area of three dimensional coordinate system established in thewild. Separating out the influence of ROV from the measured data, the magnetized fieldmap of ROV made by Surfer software is able to verify the correctness of the magneticdipole model and response the distribution of magnetized field of ROV. Analyzing theinduced magnetic field and the intrinsic magnetic field of ROV correctly is important basisfor designing degaussing system and dealing magnetic field. Deriving the related results isthe necessary preparation for ROV measuring geomagnetic field, and also for energy field,water and mineral resources field, public security field, national defense field, other keyfields of major special projects and priority themes. How get the real-time geomagnetic datais a problem that has never been resolved either at home or abroad. This paper makes aninitial assumption and does a theoretical analysis about the problem, and finally gets thereal-time geomagnetic data in theory. The unknown parameters have single property and can be obtained through actual measurement before measuring geomagnetic field. The method issimple and practical.