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

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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Problems solved by technology

[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 of the pulsar, and does not consider the satellite selection index of the spacecraft. Considering the dynamic information, the information of the navigation system is not fully utilized, and the reliability of the star selection index is relatively low

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