Abstract: The improper function model of systematic errors can lead to compensating inaccurately in marine magnetic survey,the semiparametric regression analysis theory is introduced to the two-step processing method,a non-parametric component that represents the model error is added during processing line filtering and estimation,to correct the shortcomings of poor function compensation model of systematic errors,and further to improve the compensation effect of systematic errors.A practical survey data is calculated to prove the efficiency of the method,and it shows that the accuracy of the survey network is obviously improved after compensating by using two-step semiparametric model,and the compensation effect is better than the commonly used simple model and the classic two-step processing method.

Key words: marine magnetic survey, survey line systematic error, systematic error compensation, two-step processing method, semiparametric model