Method of improving gravity field inversion precision based on disturbance intersatellite relative velocity

Abstract

The invention discloses a method of improving gravity field inversion precision based on disturbance intersatellite relative velocity. The method comprises steps that according to a satellite-borne range finer and a satellite-borne GPS receiver, and a disturbance intersatellite relative velocity (img file='DDA001263047990000011. TIF' wi='216' he='78'), a single satellite disturbance absolute velocity, and a disturbance absolute position are determined; according to the single satellite disturbance absolute velocity, a Lagrange interpolation formula is adopted to calculate a double-satellite disturbance absolute acceleration vector difference (img file='DDA0001263047990000012. TIF' wi='190' he='79'); according to the disturbance absolute position, a unit vector is determined; according to the determined unit vector and the double-satellite disturbance absolute acceleration vector difference (img file='DDA0001263047990000013. TIF' wi='202' he='78'), the line of sight (img file='DDA0001263047990000015. TIF' wi='347' he='78') of the determined double-satellite disturbance absolute acceleration vector difference (img file='DDA0001263047990000014 TIF' wi='166' he='79') is determined; according to the line of sight (img file='DDA0001263047990000015. TIF' wi='347' he='78') and the disturbance intersatellite relative velocity, a disturbance intersatellite relative velocity observation equation is determined; according to the disturbance intersatellite relative velocity observation equation, earth gravity field inversion is carried out, and earth gravitation potential coefficient precision and accumulated geoid precision are determined. The method is advantageous in that the inversion of the earth gravity field is carried out accurately and quickly, and the earth gravity field inversion precision and spatial resolution are improved.

Description

technical field [0001] The invention belongs to the field of aerospace technology, and in particular relates to a method for improving the accuracy of gravity field inversion based on disturbing the inter-satellite relative velocity. Background technique [0002] The satellite gravity measurement project is another innovation and breakthrough in the field of geodesy after the successful construction of the US Global Positioning System (GPS) constellation. Potential methods and techniques. At present, the commonly used satellite gravity measurement plan is a single formation satellite gravity plan (such as Gravity Recovery and Climate Experiment, GRACE plan). [0003] Among them, the disadvantage of the single formation satellite gravity plan is that the spatial resolution and time resolution of satellite observation data cannot be improved at the same time. According to Heisenberg’s uncertainty principle, it can be known that the spatial resolution S of satellite observati...

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Problems solved by technology

[0003] Among them, the disadvantage of the single formation satellite gravity plan is that the spatial resolution and time resolution of satellite observation data cannot be improved at the same time

[0006] However, there are also many disadvantages in the double-star formation satellite gravity plan: (1) Since the non-conservative force acting on the satellite body increases by about an order of magnitude as the satellite orbit height decreases by 100km, the unstable satellite working platform will not only affect the load. The measurement accuracy and dynamic range of the satellite will be shortened, and the flight life of the satellite will be shortened, which will affect the inversion accuracy of the Earth's static and time-varying gravity field; The attitude control of the satellite platform will be greatly increased; (3) When the relative distance between the satellites is shortened, although the measurement accuracy of the earth's medium-short-wave gravity field can be appropriately improved, the inversion of the earth's long-wave gravity field will be lost at the same time due to the too close distance between the two stars (4) Since the single-formation satellite gravity measurement plan is still used, the key problem of further improving the spatial resolution of the earth's gravity field cannot be well solved

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