Deep space exploration spacecraft cruise phase autonomous navigation method based on information fusion

Abstract

The invention relates to a deep space exploration spacecraft cruise phase autonomous navigation method based on information fusion. The method comprises the steps of (1) performing Doppler frequency shift speed measurement on the sun, and estimating spacecraft state information by combining a kinetic model and extended Kalman filtering; (2) acquiring a required navigation asteroid ephemeris tableby a spacecraft, measuring the sight vectors of a navigation asteroid, processing the acquired sight vectors by using a least square method, and calculating the state estimation value of the spacecraft; and (3) fusing the state information of the spacecraft obtained in the step (1) and the state estimation value of the spacecraft obtained in the step (2) to obtain the corrected state information of the spacecraft.

Description

technical field [0001] The invention relates to the technical field of autonomous navigation in spacecraft deep space exploration tasks, in particular to the autonomous navigation algorithm technology based on astronomical observation. Background technique [0002] Usually, the position of the spacecraft can be determined by ground station measurement and control or GNSS navigation and positioning. However, for deep space exploration missions, both have certain limitations. The ground measurement and control station will have a large transmission delay for deep space missions, and the real-time performance is poor. At the same time, the radio will be blocked by celestial bodies, causing transmission interruption; Navigation is of great significance for spacecraft to improve survivability and complete tasks effectively. [0003] At present, the commonly used deep space autonomous navigation method is astronomical optics autonomous navigation, but the current method either s...

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is: in order to meet the requirements of autonomous operation of deep space probes, and also adapt to the dilemma that my country cannot arrange measurement and control stations around the world, it provides an autonomous navigation method for the cruising section of deep space exploration spacecraft based on information fusion, It can solve the problem of large state estimation error caused by measuring the accuracy of starlight angular distance, the distance between the navigation star and the spacecraft, and the navigation ephemeris error, as well as the problem of poor accuracy of the existing dynamic model and large navigation error.

Images