High-dynamic rapid autonomous capturing method of roller shutter exposure star sensor
A star sensor, high dynamic technology, applied in the field of satellite attitude control, can solve the problem that the star sensor is difficult to achieve autonomous all-day capture, and achieve the effect of good engineering application value and improved dynamic performance.
Active Publication Date: 2021-10-22
BEIJING INST OF CONTROL ENG
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[0006] The technical problem solved by the present invention is: to overcome the deficiencies in the prior art, to propose a high-dynamic and fast autonomous capture method for rolling shutter exposure star sensors, and to solve the problem that it is difficult for star sensors to achieve autonomous all-day capture when working under high dynamics
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[0064] The present invention will be further elaborated below in conjunction with the accompanying drawings.
[0065] The present invention proposes a high-dynamic and rapid self-capturing method for a rolling shutter exposure star sensor, wherein the star sensor adopts a rolling shutter exposure method to improve product dynamic performance and update rate.
[0066] Such as figure 1 and figure 2 As shown, the specific implementation steps of the high dynamic fast autonomous capture method of a rolling shutter exposure star sensor proposed by the present invention are as follows:
[0067] For the convenience of explanation, record the star point coordinate queue at time t1 as uv_info1, the corresponding number of stars is Nstar1, the star point coordinate queue at time t2 is uv_info2, and the corresponding number of stars is Nstar2, and t2>t1, then:
[0068] 1) If t2-t1
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The invention relates to a high-dynamic rapid autonomous capturing method of a roller shutter exposure star sensor. The method comprises the following steps: firstly, selecting two frames of star maps with time variation less than a set time threshold; respectively calculating the row coordinate difference, the column coordinate difference and the distance between every two selected star points in the two frames of star maps; selecting star points from the two frames of star maps, and using a triangle matching method for matching; performing matching confirmation on the remaining star points by taking the star points in the two frames of star maps corresponding to the successfully matched triangles as references; selecting all star points which are successfully matched and confirmed in the two frames of star maps, and calculating an angular velocity average value by using the position coordinates of the same star points; performing roller shutter correction on all star point positions of the current frame by using the angular velocity average value; and finally, carrying out all-day autonomous star map recognition and attitude calculation by utilizing the corrected star point coordinates. The method effectively solves the problem of all-day autonomous capture of the roller shutter exposure star sensor under the high dynamic condition, improves the dynamic performance of the product, can be suitable for all roller shutter exposure star sensors, and has good engineering application value.
Description
technical field [0001] The invention relates to a high-dynamic and rapid self-capturing method of a rolling shutter exposure star sensor, which is suitable for the star point position correction of the rolling shutter exposure star sensor and belongs to the technical field of satellite attitude control. Background technique [0002] The star sensor is currently the attitude measurement optical sensor with the highest measurement accuracy on the satellite. It does not need a priori attitude and angular velocity information to capture and determine the attitude of the whole sky autonomously. With the advantages of high precision, no drift and high reliability, it is a key component of satellite attitude measurement. In recent years, with the continuous expansion of satellite application fields, the requirements for the attitude measurement accuracy and dynamic performance of star sensors are getting higher and higher. [0003] In order to achieve higher dynamic performance th...
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IPC IPC(8): G01C21/24
CPCG01C21/24
Inventor 郑然程会艳武延鹏夏梦绮隋杰张腾飞李玉明王苗苗张洪健曹哲田玉松
Owner BEIJING INST OF CONTROL ENG