High dynamic range fixed star detection imaging method, and star sensor
A technology with high dynamic range and imaging method, applied in the directions of instruments, measuring devices, surveying and navigation, etc., can solve the problems of HDR image artifacts, decreased time resolution, not suitable for high dynamic carrier attitude measurement, etc. Reduced resolution, high dynamic range, high resolution effects
Active Publication Date: 2020-01-17
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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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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[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.
[0031] refer to figure 1 with figure 2 As shown, the embodiment of the present invention provides a star sensor for star detection, including: an optical lens 201, a beam splitting prism 202 and an electronic system. The optical lens 201 is used to collect starlight energy in a certain sky area. The dichroic prism 202 is used for distributing the starlight energy collected by the optical lens 201 into at least two light paths with different responsivity according to the energy ratio. The electronic system includes image sensors and image processing and control circuits. The number o...
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The invention discloses a high dynamic range fixed star detection imaging method, and a star sensor. The detection imaging method comprises the steps of S1, allocating starlight energy collected by anoptical lens into at least two light paths with different responsivities according to an energy ratio by using a beam splitter prism; S2. synchronously performing photovoltaic conversion on the at least two light paths with different responsivities through an image sensor to form low dynamic range images with different responsivities; and S3. extracting effective gray information of fixed stars with different brightness levels from the low dynamic range images through an image processing and control circuit to synthesize a digital star map with a high dynamic range. By adopting the high dynamic range fixed star detection imaging method disclosed by the invention, fixed star detection with high sensitivity, high resolution and high dynamic range of the star sensor can be realized.
Description
technical field [0001] The invention relates to the technical field of attitude measurement sensitive equipment and a star sensor, in particular to a high dynamic range star detection 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 uses the detection of stars as the basis of measurement. It detects stars through optical systems and image sensors to ensure that there are enough available stars in the field of view, and then performs information processing such as target extraction, star recognition, and attitude calculation. When the detection limit magnitude of the star sensor is not high, a sufficient number of usable stars can be ensured by in...
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IPC IPC(8): G01C21/02
CPCG01C21/025
Inventor 何家维何昕魏仲慧吕游穆治亚张磊王军
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI