Method for determining integral time of 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., to improve imaging quality, high precision, and improve accuracy and precision Effect

Active Publication Date: 2017-04-05
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

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  • Method for determining integral time of off-axis camera
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  • Method for determining integral time of off-axis camera

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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

The invention relates to a method for determining integral time of an off-axis camera. With the method provided by the invention, a problem of deviation existence of integral time calculation of the off-axis camera by the traditional method can be solved. The kinematics theory and the solid geometry method, calculation is carried out by using a satellite track, an attitude, and an imaging point parameter to obtain a ground velocity vector; a vector triangle of a ground speed vector, an image speed vector, and an optical axis vector is constructed and is solved to calculate an image speed value and an image speed vector; and calculation is carried out by using parameters like a camera pixel size, a focal length, and a photograph point slope distance, thereby obtaining precise off-axis camera integral time. The method is simple, efficient, accurate, and reasonable. The deviation caused by the traditional coordinate conversion method can be eliminated; on the basis of the accurate analysis of a related physical quantity relationship, the integral time of the off-axis camera is calculated precisely, so that the accuracy of the CCD integral time calculation result can be improved, the satellite imaging quantity can be improved, and the precision in engineering application can be enhanced; and the calculation method of the drift angle of the off-axis camera can be deduced. The method is also suitable for a coaxial camera, so that the applicability of the method is high.

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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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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