Pulsar selection method based on Fisher information matrix under multi-aircraft system

An information matrix and spacecraft technology, applied in the field of spacecraft navigation, can solve the problems of low reliability of star selection indicators, insufficient utilization of navigation system information, etc., and achieve the effect of small navigation error, comprehensive information, and optimized navigation performance

Active Publication Date: 2017-06-20
NAT UNIV OF DEFENSE TECH
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[0007] The patent with the application number 201310117103.1 proposes a navigation pulsar selection method based on the Fisher information matrix. The method only considers the observation information of the spacecraft, that is, the spatial position o

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  • Pulsar selection method based on Fisher information matrix under multi-aircraft system
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  • Pulsar selection method based on Fisher information matrix under multi-aircraft system

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Embodiment Construction

[0051] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in various ways defined and covered by the claims.

[0052] This embodiment takes a multi-spacecraft system that includes three high-earth-orbit spacecraft A, B, and C and realizes autonomous navigation by observing pulsars as an example, and makes a proposal for the pulsar star selection method based on the Fisher information array under the multi-spacecraft system illustrate.

[0053] The orbital elements of the three high-orbit spacecraft A, B, and C are shown in Table 1, and the pulsar parameters observed by the multi-spacecraft system are shown in Table 2.

[0054] Table 1 The orbital elements of the three high-Earth orbit spacecraft in the multi-spacecraft system

[0055] Number of orbital elements Spacecraft A Spacecraft B Spacecraft C Semi-major axis [km] 37600 37600 37600 ...

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Abstract

The invention provides a pulsar selection method based on a Fisher information matrix under a multi-aircraft system. The method comprises the following steps: step I, establishing a kinetic model of a multi-aircraft system to obtain a state equation of the system; step II, establishing an observation model of the multi-aircraft system based on pulsar navigation to obtain an observation equation of the system; step III, establishing a Fisher information matrix of the pulsar navigation under the multi-aircraft system based on the state equation and observation equation; and step IV, selecting a pulsar with a minimum index function as the pulsar observed for the navigation, wherein the index function is a locus of an inverse matrix of the Fisher information matrix of the pulsar navigation under the multi-aircraft system obtained in the step III. By adopting the method, while the pulsar selection index is established, the kinetics information and observation information of the navigation system are also considered; and relative to the situation of only considering the observation information, the information contained in the Fisher information matrix is more complete, so that more effective evaluation can be realized, and the navigation precision is higher.

Description

technical field [0001] The invention relates to the technical field of spacecraft navigation, in particular to a method for selecting pulsars based on a Fisher information matrix, and is mainly aimed at navigation tasks of multi-spacecraft systems. Background technique [0002] The vast majority of spacecraft operating in orbit perform tasks in space as independent entities. With the development of aerospace technology, space missions are no longer limited to a single spacecraft, and multi-spacecraft systems composed of multiple spacecraft continue to emerge, such as constellations, formations, and cluster systems. Multiple spacecraft cooperate with each other and cooperate with each other, which can improve the performance of the system and better complete various space missions. [0003] Navigation and positioning is one of the key technologies in deep space exploration missions. The navigation information of the current spacecraft is mostly provided by the ground measur...

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Application Information

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IPC IPC(8): G01C21/24
Inventor 王奕迪郑伟张璐张大鹏信世军汤国建
Owner NAT UNIV OF DEFENSE TECH
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