Ultra-high accuracy star sensor

A technology of star sensor and precision, applied in the field of star sensor, can solve the problems such as the decrease of the data update rate of the star sensor, affecting the real-time dynamic test performance of the star sensor, etc. The effect of angular resolution

Inactive Publication Date: 2010-03-24
BEIHANG UNIV
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Problems solved by technology

[0003] With the increase of pixels, for example, the use of a large area array image sensor with 2048×2048 pixels will increase the attitude accuracy non-linearly, but at the same time, the amount of data will also increase linearly. For the star sensor in the tracking working mode, due to the limitation of this imaging system and working mode, the data update rate of the star sensor decreases linearly, which seriously affects the real-time dynamic test performance of the star sensor. Bottleneck of attitude information

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Embodiment Construction

[0036] The basic idea of ​​the present invention is: for a star sensor using a large area array image sensor with 2048×2048 pixels, introduce a two-way centroid-following imaging technology, read and process two-way pixel data at the same time; and, when performing star tracking, The non-feedback and non-window matching tracking based on position information can greatly improve the accuracy and data update rate of the star sensor.

[0037] like figure 1 As shown, the star sensor proposed by the present invention includes an optical imaging system 10, an image sensor 11, an image sensor drive unit 12, a two-way centroid imaging unit 13, a star tracking unit 14, a star pattern recognition unit 15, an attitude calculation unit 16 and Guide Star Catalog67.

[0038] Here, the image sensor is a large area array image sensor with 2048×2048 pixels; the star tracking unit adopts a no-feedback and non-window tracking mode. In practical applications, the image sensor drive unit 12 and ...

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Abstract

The invention discloses a star sensor with ultrahigh precision, which comprises an optical imaging system, an imaging sensor, an imaging sensor drive unit, a two-path centroid imaging unit, a star tracking unit, a star pattern recognition unit, an attitude calculation unit and a navigation star database. The star sensor is characterized in that two-path centroid tracking imaging technology is introduced to the star sensor of image sensor with pixel planar array of 2048*2048; two-path pixel data are read and processed at the same time; and when star tracking is conducted, the non-window matching tracking without feedback based on locating information is adopted. Therefore, the precision and the data updating rate of the star sensor are greatly improved.

Description

technical field [0001] The invention relates to star sensor technology, in particular to a small star sensor with ultra-high precision and high data update rate. Background technique [0002] The star sensor is a high-precision, high-reliability attitude measurement component widely used in today's aerospace vehicles. The star sensor works in real-time dynamic measurement mode. At present, its imaging devices use area array image sensors. Widely used is 1024×1024 pixels. [0003] With the increase of pixels, for example, the use of a large area array image sensor with 2048×2048 pixels will increase the attitude accuracy non-linearly, but at the same time, the amount of data will also increase linearly. For the star sensor in the tracking working mode, due to the limitation of this imaging system and working mode, the data update rate of the star sensor decreases linearly, which seriously affects the real-time dynamic test performance of the star sensor. Bottleneck of pose ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C21/02G01C21/24
Inventor 张广军江洁樊巧云魏新国
Owner BEIHANG UNIV
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