Research on the characteristics of total-field data converted from aeromagnetic vertical gradient data based on a continuation conversion filtering algorithm
Compared with aeromagnetic total-field data,aeromagnetic vertical gradient field data contain less low-frequency information.In this paper,a continuation conversion filtering algorithm is proposed to filter out part of the low-frequency information of the aeromagnetic total-field data so that these data can be better compared with the total-field data obtained from aeromagnetic gradient data conversion.We discuss the feasibility of single aeromagnetic vertical gradient measurement in areas where it is inconvenient to erect base stations.We design a simple model and a complex model with a background field and random noise to analyze the conversion effect.The model analysis shows that the effect of applying the algorithm depends heavily on the selection of upward continuation height.The magnetization intensity of the background field also affects the selection of continuation height.When the magnetization intensity of the background field is weak,the continuation height chosen is the same as the buried depth of the background field.If the magnetization intensity of the background field is strong,then the higher the continuation height,the better the effect will be.The conclusion of the model analysis is applied to the analysis of the measured aeromagnetic data.In addition,we can conclude that the effect on total-field data of conversion by the continuation conversion filtering algorithm is better than that of conversion from the aeromagnetic vertical gradient data.
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维普
