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A method for determining the integration time of an off-axis camera

A technology for determining the integration time and method, which is applied to TVs, color TV parts, electrical components, etc., can solve the problems of off-axis camera integration time calculation deviations, etc., and achieve improved imaging quality, accurate and reasonable calculation formulas, and wide adaptability Effect

Active Publication Date: 2018-02-09
BEIJING INST OF SPACECRAFT SYST ENG
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Problems solved by technology

[0005] The technical problem of the present invention is: Aiming at the problem that there is a deviation in the calculation of the integration time of the off-axis camera in the traditional method, a method for determining the integration time of the off-axis camera is proposed, which can effectively solve the problem of more and more off-axis cameras in the current engineering design Integral time calculation problems, improve the accuracy and precision of the integration time calculation results

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Embodiment Construction

[0030] (1) Calculate the ground speed vector according to the principle of kinematics;

[0031] According to the fact that the relative velocity is equal to the absolute velocity minus the implicated velocity, in general, the velocity of the imaging point relative to the satellite can be calculated by the following formula:

[0032] v 地 = ω e ×R-(v s +ω b ×H) (1)

[0033] where ω e is the earth angular velocity vector, R is the vector from the center of the earth to the imaging point, v s is the satellite velocity vector, ω b is the angular velocity vector of the satellite body coordinate system, and H is the distance vector from the satellite to the imaging point.

[0034] The ground speed is defined as the speed of the satellite relative to the imaging point, and we have

[0035] v 地 =-ω e ×R+(v s +ω b ×H) (2)

[0036] (2) Construct a vector triangle composed of several related velocity vectors, and judge the projected component direction of the ground speed on ...

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Abstract

A method for determining the integration time of an off-axis camera. Aiming at the problem of deviations in the calculation of the integration time of an off-axis camera in traditional methods, the ground velocity vector is calculated by using kinematics theory and solid geometry methods, and the satellite orbit, attitude, and imaging point parameters are used to construct Ground velocity, image velocity, and boresight vector triangle, solve the vector triangle to calculate the size of the image velocity and the image velocity vector, and use the parameters such as camera pixel size, focal length, and oblique distance of the shooting point to calculate the accurate off-axis camera integration time. The method of the present invention is simple, efficient, accurate and reasonable; it avoids the possible deviation caused by the traditional coordinate conversion method, and accurately calculates the integration time of the off-axis camera through accurate analysis of the relationship between the relevant physical quantities, thereby improving the accuracy of the calculation result of the CCD integration time , to improve the quality of satellite imaging, with higher precision in engineering applications; the calculation method of off-axis camera drift angle can also be further derived; and it is also applicable to coaxial cameras, with wider adaptability.

Description

technical field [0001] The invention relates to a method for determining the integration time of an off-axis camera, in particular to a method for calculating the integration time of a TDICCD camera which can be used when the optical axis of the camera does not coincide with the visual axis. Background technique [0002] The integration time is an important indicator of the TDICCD push-broom optical remote sensing camera on the satellite. It is related to the imaging quality of the remote sensing satellite. Accurately calculating the integration time required for real-time on-board camera imaging is the key to obtaining high-quality ground remote sensing images. one of the important prerequisites. [0003] Since the camera adopts TDICCD device for imaging, the integration time of the camera needs to be adjusted according to the orbit of the satellite. According to the principle of TDICCD imaging, the ideal integration time is the time required for the image formed by ground...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/00H04N5/353
CPCH04N17/002H04N25/53
Inventor 冯昊赵峭田百义周静刘德成汪中生孟占峰
Owner BEIJING INST OF SPACECRAFT SYST ENG
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