Autonomous spacecraft navigation system with combination of astronomical angle measurement and speed measurement, and navigation method of autonomous spacecraft navigation system

Abstract

The invention provides an autonomous spacecraft navigation system with combination of astronomical angle measurement and speed measurement, and a navigation method of the autonomous spacecraft navigation system. The navigation system comprises an astronomical speed measurement navigation subsystem, an astronomical angle measurement navigation subsystem and a main filter, wherein the astronomical speed measurement navigation subsystem is connected with the main filter and is used for observing a navigation celestial body, obtaining a spectral frequency shift measurement value of the navigation celestial body and calculating a navigation parameter of the spacecraft under an inertial coordinate system; the astronomical angle measurement navigation subsystem is connected with the main filter and is used for observing the navigation celestial body, obtaining a direction unit vector of the navigation celestial body and calculating the navigation parameter of the spacecraft under the inertial coordinate system; the main filter is connected with the astronomical speed measurement navigation subsystem and the astronomical angle measurement navigation subsystem and is used for obtaining a global optimal estimation value according to the output of the astronomical speed measurement navigation subsystem and the astronomical angle measurement navigation subsystem. By virtue of the autonomous spacecraft navigation system, sight direction angle information and astronomical spectral information of the celestial body are taken as observation quantities; the navigation information is fused by a federated filter manner; the autonomous navigation of the spacecraft in the flight process is achieved; and the high-accuracy estimation of the navigation parameter is achieved.

Description

technical field [0001] The invention relates to a navigation system and a navigation method thereof, in particular to a spacecraft astronomical angle measurement and speed measurement combined autonomous navigation system and a navigation method thereof. Background technique [0002] At present, the commonly used navigation methods include ground radio navigation, optical navigation, inertial navigation and integrated navigation. The development of these navigation methods and technologies has been very mature and widely used in space missions, but they all have their own scope of application and limitations. Especially for deep space exploration, these limitations make the realization of deep space autonomous navigation more difficult. [0003] Astronomical goniometric navigation uses geometric analysis methods or orbital dynamics filtering to calculate the position of the detector by observing information such as the viewing angle of the reference celestial body and the an...

AI Technical Summary

Problems solved by technology

However, the speed information of this method cannot be directly obtained, and further position difference or filter estimation is required, and the accuracy is limited.

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