Navigation pulsar selection method based on Fisher information matrix

An information matrix and pulsar technology, applied in the field of deep space exploration, can solve the problem of lack of navigation pulsar system and other problems

Inactive Publication Date: 2013-07-10
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0003] As a navigation information source, pulsars' position and spatial distribution will definitely affect the navigation performance, but the existing research m

Method used

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  • Navigation pulsar selection method based on Fisher information matrix
  • Navigation pulsar selection method based on Fisher information matrix
  • Navigation pulsar selection method based on Fisher information matrix

Examples

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Embodiment Construction

[0038] This example aims at the autonomous navigation scheme based on pulsar measurement in the final approach of Mars, constructs the Fisher information matrix of the navigation state and analyzes its determinant, optimizes the selection of navigation pulsars to make the navigation scheme the most observable, and uses mathematical simulation to verify the feasibility of the method. The specific implementation method of this example is as follows:

[0039] Step 1: Establishment of pulsar navigation measurement model

[0040] By receiving the X-rays emitted by the pulsar and comparing them with the standard waveforms obtained through long-term ground observations, the time difference between the arrival of the X-rays at the detector and the SSB at the barycenter of the solar system can be obtained

[0041] Δ t i = t bi - t si = ...

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Abstract

The invention relates to a navigation pulsar selection method based on a Fisher information matrix, and belongs to the technical field of deep space exploration. By using the method, a measurement simplification model for pulsar navigation is constructed; based on a relevant concept of an information theory, the Fisher information matrix in a navigation state is constructed; a navigation pulsar is selected according to a rule that the number of rows and the number of columns of the Fisher information matrix are maximum; the navigation state observability is improved; and the observability and the navigation precision of pulsar navigation are improved.

Description

technical field [0001] The invention relates to a navigation pulsar selection method based on a Fisher information matrix, and belongs to the technical field of deep space exploration. Background technique [0002] Pulsars are a class of rotating neutron stars that emit a unique, stable, and predictable X-ray signature. The characteristics of pulsars provide a new development direction for space autonomous navigation. By measuring the X-rays emitted by pulsars, autonomous navigation independent of the deep space network on the ground can be realized. In recent years, both NASA and ESA are considering pulsars as a potential source of navigation information. Scholars at home and abroad have also conducted a lot of research on the basic theory and navigation accuracy of pulsar navigation. [0003] As a source of navigation information, pulsars' position and spatial distribution will definitely affect the navigation performance, but the existing research mainly focuses on the ...

Claims

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Application Information

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IPC IPC(8): G01C21/24
Inventor 崔平远于正湜朱圣英高艾徐瑞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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