A visual autonomous navigation method for satellite relative to asteroid

Abstract

The invention discloses an autonomous navigation method for a satellite relative to asteroid vision. The method comprises the following steps: designing a theoretical flight track parameter of the satellite in order to track and observe an asteroid; establishing an autonomous navigation system state model according to a track dynamical model of the satellite relative to a target asteroid under a geocentric inertial coordinate system; proposing a theoretical light condition and an imaging condition which is met by a satellite star sensor shall in order to observe the asteroid; calculating a theoretical azimuth angle and pitch angle of the asteroid relative to the satellite; adjusting a practical optical axis of the satellite star sensor to be consistent to a theoretical direction; practically observing the asteroid and establishing an observation equation which takes a unit direction vector and a distance as observed quantity; and adopting Unscented kalman filtering for establishing satellite position and velocity. According to the invention, the position error of the satellite can be effectively corrected; the navigation precision can be increased; the method is suitable for the autonomous navigation of the satellite for tracking the target asteroid; high-precision navigation information is supplied to the satellite for tracking the target asteroid; and a reference is supplied for the design of an autonomous navigation system for the satellite.

Description

technical field [0001] The invention belongs to the space measurement field of spacecraft deep-space exploration, and in particular relates to a satellite-relative asteroid visual autonomous navigation method. Background technique [0002] With the development of deep space exploration technology, asteroid detection has become one of the important contents of deep space exploration in the 21st century. Carrying out asteroid detection will not only help to uncover the mystery of the origin and evolution of the solar system and life, but also promote the protection of the earth , The development of space science and space technology applications can provide verification for key technologies of further deep space exploration. [0003] At present, all major aerospace countries attach great importance to the formulation of deep space exploration strategies, and have clarified their respective development directions and priorities from a strategic height. However, the current dete...

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Problems solved by technology

[0005] Purpose of the invention: The present invention aims at the problem of asteroid-oriented deep-space exploration, where satellites cannot continuously track and observe asteroids, resulting in information loss. Space exploration satellites provide high-precision relative observation information

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