Sea-air gravity intersection search method based on actual intersection of survey line network

Abstract

The earth's gravitational field is one of the basic physical fields of the earth, which reflects the spatial distribution, movement and change of the earth's internal matter, and is the external expression of the earth's material distribution and the earth's rotation movement information. As one of the main objectives of modern geodesy, high precision geophysical field information measurement is also an important support to establish global gravity field model and determine geoid. As the main method of high precision gravity survey, sea-air gravity survey has the characteristics of high speed, high efficiency and high precision. The process of sea-air gravimetry is mainly divided into gravity data acquisition and gravity data processing, and as the transition between the two, the calculation of the intersection of the sea-air gravimetry line network plays an important role. In view of the low precision and complex operation of the current calculation method of intersection search, this paper proposes a new method to realize intersection search based on the actual intersection of survey line network, and verifies the simplicity and effectiveness of this method through simulation data and measured data. The results show that the accuracy of the new method is about 0.02 mGal higher than that of the slope method of primary and secondary survey line, and the calculation speed is faster than that of the determinant method.