Method for constructing global gravity field based on carrier phase differential velocity

Abstract

The invention discloses a method for constructing a global gravity field based on carrier phase differential velocity, which relates to the technical field of satellite gravity detection. The method comprises the following steps: S1, carrying out data preprocessing on a carrier phase, orbit state information, an accelerometer, satellite attitude and other original observation values; S2, obtainingsatellite kinetic energy and a rotation position by utilizing a carrier phase differential speed; and S3, establishing an observation equation through the satellite kinetic energy, the rotation position and various perturbation positions, and estimating a global gravity field potential coefficient under a least square criterion based on the energy conservation law. Compared with the traditional energy conservation method for inverting the gravity field model by using the orbit differential velocity, the algorithm provided by the invention does not need to estimate the phase ambiguity, reducesthe system deviation between epochs, is convenient to implement quality control on the motion velocity of the carrier, so that the resolving precision of the global gravity field model is improved.

Description

Technical field [0001] The invention relates to the technical field of satellite gravity detection, in particular to a method for constructing a global gravity field based on carrier phase differential velocity. Background technique [0002] The earth's gravitational field is the most basic physical field of the earth, which reflects the distribution of the earth's adjacent space and its internal matter. Therefore, the construction of a refined global gravitational field model is one of the active research fields in earth science related disciplines. The use of satellite gravity measurement technology can significantly improve the long-wave information in the gravitational field. The energy conservation method based on satellite tracking satellite technology to retrieve the global gravitational field model is simple and efficient and is widely used. [0003] The energy conservation method establishes the functional relationship between the velocity of the carrier and the position c...

AI Technical Summary

Problems solved by technology

The commonly used method to calculate the velocity of the carrier is the classic orbit differential method, which uses the satellite orbit information as a bridge. Therefore, the first premise is that the orbit must be determined first. At the same time, it is easily affected by the geometric configuration distribution of the satellite, resulting in limited calculation accuracy. Therefore, There is an urgent need for a method for constructing a global gravity field model based on carrier-phase differential velocity

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