High dynamic range star detection imaging method and star sensor

Abstract

The invention discloses a high dynamic range star detection and imaging method and a star sensor, wherein the detection and imaging method includes: S1, using a dichroic prism to distribute the starlight energy collected by an optical lens into at least two light paths with different responsivity according to the energy ratio; S2. At least two optical paths with different responsivity are respectively photoelectrically converted through one image sensor synchronously to form low dynamic range images with different responsivity; S3. Different brightness levels in each low dynamic range image are extracted through image processing and control circuits The effective grayscale information of the stars is synthesized into a digital star map with a high dynamic range. The invention can realize star detection with high sensitivity, high resolution and high dynamic range of the star sensor.

Description

technical field [0001] The invention relates to the technical field of attitude measurement sensitive equipment and star sensors, in particular to a high dynamic range star detection and imaging method and a star sensor. Background technique [0002] The measurement principle of the star sensor is to measure the component of the star vector in the star sensor coordinate system by imaging the starry sky, and then use the known precise position of the star to determine the three-axis attitude of the carrier relative to the inertial coordinate system. The star sensor is based on the detection of stars. It detects stars through optical systems and image sensors to ensure that there are enough stars available in the field of view, and then performs information processing such as target extraction, star recognition, and attitude calculation. When the detection limit of the star sensor is not high, a sufficient number of available stars can be ensured by increasing the field of vie...

AI Technical Summary

Problems solved by technology

At present, in the world, the highest dynamic range that image sensors (imaging devices) can achieve is generally about 90dB. It is difficult to achieve such a large dynamic range imaging only by virtue of the characteristics of the imaging device itself.

However, the multiple-exposure synthesis method commonly used in the field of HDR imaging requires multiple exposures of the same scene in time-sharing. Suitable for high dynamic carrier attitude measurement

Although methods such as digital micromirror device imaging and detector pixel synthesis can expand the imaging dynamic range, they all have their limitations and are not suitable for star sensors.

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