Method for estimating attitude and parameters of non-cooperative spacecraft without gyroscope

Abstract

The invention discloses a method for estimating attitude and parameters of a non-cooperative spacecraft without a gyroscope, and the method comprises the following steps of considering the problem that the relative coordinate system of the target non-cooperative spacecraft established according to the optical sensor does not coincide with its body coordinate system, establishing an attitude kinematics and dynamics model of the non-cooperative spacecraft of the quick-roll space in the relative coordinate system of the target non-cooperative spacecraft; selecting the error of the attitude quaternion vector part, the three-axis rotational angular velocity and the rotary inertia ratio of the target non-cooperative spacecraft as the filtering variable, and deducing the discrete state equationsand observation equations of the linearized system; designing a multiplicative extended Kalman filter, and improving the five-step prediction to improve the accuracy of filtering estimation and the fastness of follow-up, thereby solving the problem of increased filtering errors caused by over-low sampling frequency of the optical sensor.

Description

technical field [0001] The invention belongs to the field of spacecraft navigation, and particularly relates to a non-cooperative spacecraft attitude and parameter estimation method considering no gyroscope, capable of identifying the moment of inertia ratio of space non-cooperative spacecraft and realizing high-precision, real-time relative attitude motion estimation. Background technique [0002] Spacecraft attitude determination is to determine the attitude of the main body with star sensors and gyroscopes. At present, most of the tasks faced are the maintenance of failed spacecraft and the capture of out-of-control spacecraft. control the spacecraft. This type of spacecraft often rolls rapidly out of control in space, so it is necessary to obtain the motion state and dynamic parameters of the non-cooperative spacecraft when the target shape characteristics are unknown, there is no response, and there is no identification. Specifically, in order to implement tasks such a...

AI Technical Summary

Problems solved by technology

However, this method can only determine the attitude of the main body, and is not suitable for the relative navigation of non-cooperative spacecraft

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