Earth gravity field model modeling method based on orbital mask differential operator

Abstract

The invention discloses an earth gravity field model modeling method based on an orbit mask differential operator, which relates to the technical field of satellite gravity detection. The method comprises the steps of: carrying out the data preprocessing of orbit state information, a satellite-borne accelerometer and satellite attitude data, calculating the movement speed of the satellite by usingan orbit mask differential operator so as to obtain the kinetic energy and the rotation position of the satellite, establishing an observation equation meeting the law of conservation of energy through satellite kinetic energy, a rotation position, a conservative force position and a non-conservative force position, estimating a position coefficient correction value under the least square criterion, and determining a final earth gravity field model by adding a reference gravity field model position coefficient. Compared with a traditional method for determining the earth gravity field model by utilizing the orbit Newton polynomial differential speed, the method provided by the invention effectively suppresses high-frequency error amplification to realize noise reduction, is high in flexibility and calculation efficiency, obtains a high-precision satellite speed observation value, and further improves the precision level of the earth gravity field model.

Description

Technical field [0001] The invention relates to the technical field of satellite gravity detection, in particular to an earth gravity field model modeling method based on an orbit mask differential operator. Background technique [0002] The earth's gravitational field is the most basic physical field of the earth, reflecting the movement of the earth's adjacent space and its internal matter. Therefore, determining the high-precision earth gravitational field model is a hot issue in the study of earth-related disciplines. The use of satellite gravity measurement technology to improve the long-wave signals in the gravitational field, and the energy conservation method based on satellite tracking satellite technology to determine the earth's gravitational field model is simple and efficient and widely adopted. [0003] The energy conservation method is to establish the linear function relationship between the satellite motion speed and the position coefficient of the earth's gravitat...

AI Technical Summary

Problems solved by technology

The commonly used method to calculate the velocity of satellite motion is the classic Newton’s differential method, that is, to calculate the satellite velocity through the first-order differential formula of Newton’s interpolation, which leads to high-frequency error amplification, reduces the signal-to-noise ratio of velocity observation data, and affects the modeling accuracy of the gravity field model.

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