Asteroid gravity field inversion method and system based on master-slave satellite speed measurement mode

Abstract

The invention discloses an asteroid gravitational field inversion method and system based on a master-slave satellite speed measurement mode, an observation link between a master satellite and a slave satellite surrounding the same asteroid is built, the master satellite and the slave satellite are realized by adopting a detector respectively, a ground deep space station keeps tracking with the master satellite running around the asteroid, and the observation link is connected with the master satellite and the slave satellite; two-way speed measurement is carried out between the master satellite and the slave satellite surrounding the same asteroid; partial derivatives of coordinates of the detectors and gravitational field coefficients are respectively calculated by using the inter-satellite observation values, and a Jacobian matrix is obtained and solved, so that accurate orbits and asteroid gravitational field coefficients of the two detectors are determined, and a gravitational field inversion result with higher precision is extracted. According to the method, on the basis of establishing a two-way velocity measurement mode based on the master satellite and the slave satellite, the coordinates and the gravitational field coefficients of the master satellite and the slave satellite are integrally calculated, so that the precise coordinates of the master satellite and the slave satellite can be obtained, and the inversion precision of a gravitational field model can be improved, thereby providing high-precision navigation for a detector.

Description

technical field [0001] The invention belongs to the field of asteroid gravity field inversion and deep space navigation, and in particular relates to an asteroid gravity field inversion method and system in a master-slave star velocity measurement mode. Background technique [0002] Over the past three decades, the United States, ESA and Japan have been very active in comet / asteroid exploration missions, the main missions being: low-Earth orbit mission to asteroid Eros, Hayabusa to asteroid Itokawa missions, the Rosetta mission to Comet 67P, the Dawn mission to Vesta and Ceres, the Hayabusa2 mission to the asteroid Ryugu, and the Osiris mission to the asteroid Bennu. [0003] Asteroids are small celestial bodies in the solar system, orbiting the sun like planets, but much smaller in size and mass than planets. Asteroids in a broad sense range in size between meteoroids and dwarf planets, ranging from a few meters to 1,000 kilometers in diameter, and include all small object...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the traditional two-way speed measurement mode cannot maintain communication with the detector in time, establish the connection between the master and slave stars, and provide an asteroid gravity field inversion scheme based on the master-slave speed measurement mode

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