Active imaging type star sensor and control method thereof

Abstract

The invention discloses an active imaging type star sensor and a control method thereof. The star sensor comprises a front group of optical lenses, a DMD (digital micro-mirror device) chip, a DMD driving control unit, a rear group of optical lenses, a detector, a data acquisition unit and a star point data processing system; the front group of the optical lenses enables a micro-mirror on the DMD chip to reflect star light in a first working state, and controls the micro-mirror in a star point area to work in the first working state according to the working state of the micro-mirror; the rear group of the optical lenses converges the star light energy which is reflected by the micro-mirror on the DMD chip to the detector; the detector detects star point energy which is reflected by the micro-mirror on a detected DMD chip in the first working state; the data acquisition unit acquires an electric signal, and performs A / D conversion on the electric signal; the star point data processing system is used for generating a star map random template. According to the star sensor, the DMD chip can be applied to the star sensor so as to improve the dynamic performance of the star sensor, improve the updating rate, and effectively improve the precision of the star sensor.

Description

technical field [0001] The invention relates to the technical field of satellite attitude determination, in particular to an active imaging star sensor based on a digital micromirror device and a control method thereof. Background technique [0002] At present, the star sensor is a kind of attitude measurement sensor often used in the satellite attitude control system, and is considered to be the core instrument in the satellite attitude measurement. [0003] In related technologies, the star sensor generally adopts the camera-type large-area array blind imaging principle, that is, the field of view space is simultaneously and uniformly imaged without considering the target, and all pixels are scanned for each frame of image, and then imaged. Perform image processing and target extraction. However, the star sensor of the related technology has no clear purpose, that is, it is not targeted, which not only consumes a lot of energy, but also brings a lot of difficulties to the...

AI Technical Summary

Problems solved by technology

However, the star sensor of the related technology has no clear purpose, that is, it is not targeted, which not only consumes a lot of energy, but also brings a lot of problems to the subsequent image processing

[0004] For example, during the motion of the spacecraft, the stars will form a long trajectory covering dozens of pixels on the large area array detector, which will cause the signal of each imaging pixel on the detector to become weaker and the signal-to-noise ratio to decrease. Significantly insufficient accuracy and update rate, or even work at all

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