A high dynamic and fast autonomous capture method of rolling 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: 2022-07-05
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 described below with reference to the accompanying drawings.
[0065] The invention proposes a high-dynamic and fast autonomous capture method for rolling shutter exposure star sensor, wherein the star sensor adopts the rolling shutter exposure method to improve the dynamic performance and update rate of the product.
[0066] like figure 1 and figure 2 As shown, the specific implementation steps of a high-dynamic and 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, the star point coordinate queue at time t1 is uv_info1, the corresponding number of stars is Nstar1, the star point coordinate queue at t2 time is uv_info2, the corresponding star number is Nstar2, and t2>t1, then:
[0068] 1) If t2-t1
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A high-dynamic and fast autonomous capture method of a rolling shutter exposure star sensor, firstly, two frames of star maps whose time variation is less than a set time threshold are selected; The difference and distance of the column coordinates; the selected star points in the two frames of star images are matched by the triangle matching method; the remaining star points are matched and confirmed based on the matching successful triangle corresponding to the star points in the two frames of star images; All star points in the picture that are successfully matched and confirmed, use the same star point position coordinates to calculate the average angular velocity; use the average angular velocity to correct the positions of all star points in the current frame. Recognition and pose calculation. The invention effectively solves the problem of self-capturing all day under the high dynamic condition of the rolling shutter exposure star sensor, improves the dynamic performance of the product, is applicable to all rolling shutter exposure star sensors, and has good engineering application value.
Description
technical field [0001] The invention relates to a high-dynamic and fast autonomous capturing method of a rolling shutter exposure star sensor, which is suitable for 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 the attitude measurement optical sensor with the highest measurement accuracy currently on the satellite. It does not require prior attitude and angular velocity information to capture and determine the autonomous attitude of the entire celestial sphere. It has the advantages of high precision, no drift and high reliability, and is a key component of satellite attitude measurement. In recent years, with the continuous expansion of the satellite application field, the requirements for the attitude measurement accuracy and dynamic performance of the satellite sensor are getting higher and higher. [0003] In order to achieve h...
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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