Astronomical/doppler combined navigation method for spacecraft

Abstract

The invention combines independent astronavigation with Doppler method. Method combines direct sensing horizon with indirect sensing horizon is adopted in astronavigation. One-way Doppler is adopted in Doppler method. Using method of Unscented Kalman filtering carries out united filtering, estimating position of spacecraft and speed guidance message. The invention can be in use for determining navigation parameters of earth satellite, manned spacecraft accurately in applications of observation over the ground, communication, and positioning navigation etc.

Description

technical field [0001] The invention relates to a navigation method of a spacecraft, which can be used for accurate determination of navigation parameters of earth satellites and manned spacecraft such as earth observation, communication, positioning and navigation. Background technique [0002] At present, earth satellites and manned spacecraft mainly rely on the ground station measurement and control method (Doppler method) for positioning and navigation. Due to the limitation of geographical conditions, for medium and low orbit spacecraft, the orbital arc segment that can be measured and controlled by domestic ground stations is very short, and it is difficult to realize the positioning and navigation of the entire orbit; for long-distance spacecraft, there is a long time delay and low angle measurement accuracy And other issues. At the same time, the ground system may also be damaged and interfered, and the information transmission between the spacecraft and the ground ...

AI Technical Summary

Problems solved by technology

However, since celestial navigation only uses the angle observation information between the celestial body and the spacecraft, the navigation accuracy is not very high due to the restriction of the accuracy of the celestial body sensor

Moreover, due to the existence of deterministic errors and random errors in the spacecraft autonomous celestial navigation system model, it is impossible to accurately establish the state model of the navigation system

Therefore, the accuracy of the output navigation information is not high, and even the filter divergence may occur.

[0005] To sum up, the current Doppler method commonly used by earth satellites and manned spacecraft has the disadvantages of being involuntary, having a short track for measurement and control, and not suitable for long-distance measurement and control. low precision

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