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Star sensor and high-frequency angular displacement sensor integrated attitude determination method and system

An angular displacement sensor and star sensor technology, which is applied in the directions of instrumentation, surveying and mapping, navigation, navigation, etc., can solve the problem that low-frequency attitude data cannot meet the geometric processing requirements of high-resolution optical satellite images.

Active Publication Date: 2016-04-13
WUHAN UNIV
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Problems solved by technology

[0003] Aiming at the problem that the current low-frequency attitude data is difficult to meet the geometric processing requirements of high-resolution optical satellite images, the present invention provides a high-precision combination attitude determination technology scheme based on low-frequency star sensors and high-frequency angular displacement sensors

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[0102] The technical solution of the present invention will be described in detail below in conjunction with the drawings and embodiments.

[0103] see figure 1 The flow chart of the combination of star sensor and high-frequency angular displacement sensor for attitude determination technology is shown, and the method of the present invention will be further described in detail for each step in the process of the embodiment below.

[0104] Step 1. According to the working principle of the angular displacement sensor, a reasonable error measurement model is constructed, fully considering various error sources in its measured values.

[0105] As an inertial attitude sensor, the angular displacement sensor can directly output high-frequency angular increment data. The meaning of the obtained measurement data is the angular increment generated in the time interval between the sampling moment and the previous sampling moment. According to the above principle, it is obtained that a...

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Abstract

The invention provides a star sensor and high-frequency angular displacement sensor integrated attitude determination method and system. The method comprises the steps that an error measurement model is built according to a measurement principle of an angular displacement sensor, and various error sources existing in observed values are fully considered; a system measuring equation is built based on multiple star sensor information fusion results; a system state equation is built according to a satellite attitude kinematic equation and an angular displacement sensor measurement model; finally, high-frequency attitude parameter optimal estimation is achieved by adopting bi-directional Kalman filtering and an overall weighted adjustment model. According to the star sensor and high-frequency angular displacement sensor integrated attitude determination method and system, optimal information fusion of the low-frequency star sensor and the high-frequency angular displacement sensor can be achieved, high-frequency high-precision attitude data is obtained, and therefore a foundation is laid for high-resolution optical image high-precision geometric processing.

Description

technical field [0001] The invention belongs to the field of ground preprocessing of remote sensing satellites, and in particular relates to a method and system for determining an attitude by combining a star sensor and a high-frequency angular displacement sensor. Background technique [0002] High-resolution optical satellites are one of the important research fields for the development of my country's high-resolution earth observation system. In the next ten years, my country will launch several optical satellites with a spatial resolution better than 1 meter (referred to as sub-meter optical satellites). The spatial resolution can even reach about 0.1 meters. However, higher spatial resolution does not mean higher geometric relative accuracy. Since the high-resolution optical satellite push-broom imaging frequency is tens of thousands of hertz, while the attitude frequency output by the traditional combination of star sensor and gyroscope for attitude determination is se...

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Application Information

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IPC IPC(8): G01C21/20G01C21/16G01C25/00
CPCG01C21/165G01C21/20G01C25/00
Inventor 王密范城城李德仁
Owner WUHAN UNIV
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