ANGULAR COORDINATION FOR TREE-AXIL DIFFERENTIAL MAGNETOMETERS
Fixed underwater measurement ranges as well as portable magnetic search systems use multitudes of three-axial magnetic sensors to measure a specific magnetic field against the field of the Earth. These sensors are to measure under the same coordinate system called reference system. Meanwhile the sensor’s coordinate systems differ from one another. The difference produces a considerable error in the final measurement result. For many years this sort of error was considered difficult in reducing. In 2002 a correction matrix method was developed to improve significantly each sensor’s accuracy. This method did not solve the problem of the angular mismatch between the sensors, but it has paved the way for the matching. Recently two new methods have been added to the correction matrix for the angular coordination of three-axial magnetic sensors. One of them is intended for calibration without disassembly of magnetometers at the fixed underwater measurement ranges. The other one is meant for the portable magnetic search systems. These methods allow reducing tens of times the errors from the angular mismatch.