A ccd pixel position deviation measurement device

A technology of deviation measurement and pixel position, applied in the aerospace field, can solve the problem of lack of a device for accurately measuring the position deviation of CCD pixels, and achieve the effect of strong adaptability and simple device

Active Publication Date: 2017-07-14
NAT SPACE SCI CENT CAS
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect in the prior art that lacks a device for accurately measuring CCD pixel position deviation, thereby providing a professional CCD pixel position deviation measurement device

Method used

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  • A ccd pixel position deviation measurement device

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Embodiment Construction

[0019] The present invention will be further described now in conjunction with accompanying drawing.

[0020] refer to figure 1 , the CCD pixel position deviation measuring device of the present invention comprises: a frequency-stabilized laser 1, a splitting optical fiber 2, a frequency modulator 3 and a frequency difference drive controller 4; wherein the frequency-stabilized laser 1 provides laser with stable frequency and stable power; The beam-splitting fiber 2 splits the laser into two coherent laser beams with the same or nearly the same power; the two coherent laser beams are respectively input into the frequency modulator 3 of the two optical fiber interfaces, and the difference frequency drive controller 4 controls the two coherent laser beams The frequency difference of the laser makes the two beams of coherent lasers form a difference-frequency coherent laser 5 through the frequency modulator 3; the difference-frequency coherent laser 5 forms moving interference fr...

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Abstract

The invention relates to a CCD pixel position deviation measuring device which comprises a frequency stabilized laser (1), a beam splitting device, frequency modulators (3) and a difference frequency driving controller (4). The frequency stabilized laser (1) provides laser with stable frequency and stable power. The beam splitting device divides the laser into two coherent laser beams with the same or similar power. The two coherent laser beams are input into the two frequency modulators (3) respectively, the difference frequency driving controller (4) controls the frequency difference of the two coherent laser beams, and accordingly the two coherent laser beams form difference frequency related laser (5) through the frequency modulators (3).

Description

technical field [0001] The invention relates to the aerospace field, in particular to a CCD pixel position deviation measuring device. Background technique [0002] The star sensor is an important instrument for spacecraft or aircraft attitude measurement. It completes star map recognition and attitude calculation by measuring the angular distance between star images, and the centroid or centroid positioning of star images determines the attitude measurement accuracy. a key element of . At present, the center of mass positioning is mostly completed by Gaussian fitting or center of gravity calculation. This process only considers the quantum efficiency and noise of the CCD (or other image sensors such as APS) pixels, and does not consider the non-uniformity of the CCD pixel position, while the CCD pixel Non-uniformity has a great influence on the positioning accuracy of star image centroid. The simulation shows that if the non-uniformity of CCD pixels is accurately measured,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/00
Inventor 李保权李海涛曹阳
Owner NAT SPACE SCI CENT CAS
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