One compensating method of SMIE based on coupling matrix

As the terrestrial magnetism measurement component is easily corrupted by the environment magnetism, deeply error magnetism is given and error model is established in this paper. Comparing with time-consuming, inefficient and easily affected degree of accuracy feature about traditional method, a compensating method based on the coupled matrix is given. This method employs optimal square triangular approximation method to make error compensating for the soft magnetic interference error(SMIE), which is tested at prototype. The results show that the relative error of the total terrestrial magnetism falls from 57% to 1.6% after compensating. It can improve the comprehensive accuracy tremendously.