Calculation on three-component magnetic field of current wire based on the coordinate transformation method

In the degaussing process, the three-component magnetic field of induced magnetic field brings by degaussing coils in a given coordinate system (such as the ship coordinate system) is always one of the key issues. The problem ends in calculating the three-component magnetic field in a given coordinate system of the current wire. The paper presents a simple and straightforward method that can quickly and easily solve the problem, as more as easy to program and practical.